--- title: "Tirzepatide: Dosing & Vendor Prices | BodyHackGuide" url: https://www.bodyhackguide.co/compound/tirzepatide description: "Tirzepatide: dosing protocols, mechanism & side effects, 626 PubMed results. Compare 6 current vendor prices." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Image: Tirzepatide molecular structure (https://www.bodyhackguide.co/assets/peptide-structure-placeholder-DUmZBF_j.png) # Tirzepatide Metabolic & Weight Loss (https://www.bodyhackguide.co/wiki#cat-metabolic-&-weight-loss)FDA Approved Also known as: GLP-2T, GIP/GLP-1, ION-2T, GLP-2, Tirzepatide, PEP-2T, RC-2T, Dual Agonist, Ion Peptide Tirzepatide, Tirz, GIP/GLP Tirzepatide is a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist with a molecular weight of 4813.45 Da and CAS number 2023788-19-2. It is a 39-amino-acid synthetic peptide based on the native GIP sequence with modifications that confer activity at both GIP and GLP-1 receptors. R Featured vendor $5.00/mg $299.99 for 60mg at ResearchChemHQ · Buy at RC: https://researchchemhq.co/product/rc-2t/?ref=oyxnywoz Half-life: ~5 days (approximately 120 hours), enabled by C20 fatty diaci… Route: Subcutaneous (weekly) MW: 4813.5 Da CAS: 2023788-19-2 626 PubMed results (https://pubmed.ncbi.nlm.nih.gov/?term=tirzepatide%20GIP%20GLP-1) Last reviewed: May 4, 2026 Reconstitution Calculator for Tirzepatide Pre-filled · 10mg vial · 2500mcg dose https://www.bodyhackguide.co/tools/reconstitution/tirzepatide ## Overview ### At A Glance Mechanism Dual GLP-1 and GIP Receptor Agonism… Half-Life ~5 days (approximately 120 hours), enabled by C20 fatty diacid albumin-binding modification Dosing Once weekly subcutaneous injection Dose Range 2500 mcg (2.5 mg) starting dose, titrated every 4 weeks through 5000, 7500, 10000, 12500, to 15000 mcg (15 mg) maximum weekly dose Routes Subcutaneous (weekly) Common Vials 5mg 10mg 15mg Potential Benefits Mean body weight reduction of 22.5% at 72 weeks - highest of any anti-obesity medication (PMID: 35658024) 36.2% of participants achieved greater than or equal to 25% body weight loss (PMID: 35658024) Significant HbA1c reduction in type 2 diabetes (up to 2.4% at 40 weeks in the SURPASS-5 add-on-to-insulin trial) (PMID: 35133415) Potentially superior lean mass preservation versus GLP-1-only agents due to GIP component Dual incretin mechanism providing complementary metabolic benefits Improved lipid profiles including triglycerides, LDL cholesterol, and HDL cholesterol Reduction in waist circumference and markers of visceral adiposity (PMID: 37840095) Safety Notes Common Nausea (most common, 24-33% depending on dose, typically transient) Diarrhea (17-23%) Vomiting (6-13%, more common during titration) Decreased appetite (considered both effect and side effect) Constipation (6-11%) Injection site reactions (3-7%) Serious Pancreatitis (rare but reported — discontinue if suspected) Gallbladder disorders including cholelithiasis with rapid weight loss Medullary thyroid carcinoma (MTC) boxed warning based on rodent C-cell tumor findings Hypoglycemia when combined with insulin or sulfonylureas Acute kidney injury secondary to dehydration from GI side effects ### Overview Tirzepatide is a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist with a molecular weight of 4813.45 Da and CAS number 2023788-19-2. It is a 39-amino-acid synthetic peptide based on the native GIP sequence with modifications that confer activity at both GIP and GLP-1 receptors. Tirzepatide features a C20 fatty diacid moiety attached via a linker to facilitate albumin binding, resulting in a plasma half-life of approximately 5 days that supports once-weekly subcutaneous dosing. Tirzepatide is FDA-approved under two brand names: Mounjaro (for type 2 diabetes mellitus, approved May 2022) and Zepbound (for chronic weight management, approved November 2023). It is manufactured by Eli Lilly and Company and represents the first-in-class dual GIP/GLP-1 receptor agonist to reach the market. The SURMOUNT clinical trial program established tirzepatide as the most effective pharmacological weight loss agent to date. In the SURMOUNT-1 trial, participants with obesity or overweight (without diabetes) receiving tirzepatide 15 mg weekly achieved a mean body weight reduction of 22.5% from baseline at 72 weeks, compared to 2.4% with placebo — a treatment difference of 20.1 percentage points. Notably, 36.2% of participants in the 15 mg group achieved 25% or greater total body weight loss, approaching the magnitude historically seen only with bariatric surgery (PMID: 35658024). The SURMOUNT-2 trial evaluated tirzepatide in adults with type 2 diabetes and obesity, demonstrating mean weight loss of 14.7% with tirzepatide 15 mg versus 3.2% with placebo at 72 weeks, along with significant HbA1c improvement. The SURMOUNT-3 trial studied tirzepatide following an intensive 12-week lifestyle intervention, showing that tirzepatide maintained and extended initial weight loss while placebo recipients regained weight (PMID: 37840095). A key differentiating feature of tirzepatide compared to pure GLP-1 receptor agonists such as semaglutide is the GIP receptor agonist component. GIP signaling in adipose tissue is proposed to improve lipid metabolism and may protect against the loss of lean body mass that accompanies caloric restriction and weight loss. Preclinical and early clinical data suggest that tirzepatide-treated patients lose a greater proportion of fat mass relative to lean mass compared to GLP-1-only agents, though this finding requires further validation in dedicated body composition studies. Tirzepatide achieved the highest absolute weight loss of any anti-obesity medication in clinical trials. At the 15 mg dose, mean absolute weight loss was approximately 24 kg (52 lbs) at 72 weeks in SURMOUNT-1. The gastrointestinal side effect profile is similar to GLP-1 receptor agonists, with nausea being the most common adverse event, generally mild to moderate and diminishing over time with dose titration. ### Potential Research Fields Obesity Type 2 diabetes NASH Sleep apnea Heart failure with preserved EF ## Chemical Information IUPAC Name Not fully specified (proprietary sequence) CAS Number 2023788-19-2 Molecular Formula C225H348N48O68 Molecular Mass 4813.49 g/mol Image: Tirzepatide molecular structure (https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/2736038/PNG?image_size=300x300) View on PubChem: https://pubchem.ncbi.nlm.nih.gov/compound/2736038 Amino Acid Sequence 39-amino-acid synthetic peptide agonist of both the GIP and GLP-1 receptors. Sequence: Tyr-Aib-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Tyr-Ser-Ile-Aib-Leu-Asp-Lys-Ile-Ala-Gln-Lys-Ala-Phe-Val-Gln-Trp-Leu-Ile-Ala-Gly-Gly-Pro-Ser-Ser-Gly-Ala-Pro-Pro-Pro-Ser (one-letter: YXEGTFTSDYSIXLDKIAQKAFVQWLIAGGPSSGAPPPS, where X = Aib, 2-aminoisobutyric acid, at positions 2 and 13). Key modifications: the lysine at position 20 is conjugated through a gamma-glutamate + 2x AEEA [2-(2-aminoethoxy)ethoxy-acetyl] linker to a C20 fatty diacid (eicosanedioic acid), which drives albumin binding and the ~5-day half-life; the C-terminus is a primary amide. Molecular formula C225H348N48O68 (~4813.5 Da). ## Dosing & Protocols ### Unlock the dosing protocols Enter your email to keep reading. It is free, and it opens these tabs on every compound page in this browser. - Dose, route, how often and how long - A titration schedule - Beginner, intermediate and advanced protocols - Reconstitution and handling notes You also get the free peptide cheat sheet by email. Unsubscribe anytime. Have an account? Sign in (https://www.bodyhackguide.co/auth) ## Research ### Unlock the research summary - A summary of the key research - Safety and side effects - A link to the PubMed results ## Interactions ### Interaction Matrix ### Contraindications Personal or family history of MTC. MEN 2 syndrome. History of pancreatitis. Severe GI disease. Pregnancy or breastfeeding. Research Disclaimer This interaction data is compiled from published research and community reports. It may not be exhaustive. Always consult a healthcare professional before combining compounds. 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Sign in (free, no spam) to share your experience with Tirzepatide. Current low $49.00 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet Tracking since Mar 13, 2026 · 15 data points ## Price History 4 data points ### Vendors Selling Tirzepatide #### Ion Peptide 4.5 6 listings · from $49.00 https://www.bodyhackguide.co/vendors/ion-peptide #### VANDL Labs 5 listings · from $59.99 https://www.bodyhackguide.co/vendors/vandl-labs #### Disguised Alpha 1 listing · from $69.99 https://www.bodyhackguide.co/vendors/disguised-alpha #### BioMyst Labs 4.5 2 listings · from $79.99 https://www.bodyhackguide.co/vendors/biomyst-labs #### Optimum Formula 4.9 2 listings · from $94.99 https://www.bodyhackguide.co/vendors/optimum-formula #### ResearchChemHQ 4.7 1 listing · from $299.99 https://www.bodyhackguide.co/vendors/researchchemhq How we score these vendors Every supplier above is graded 0 to 100 on COA verification, payment transparency, shipping, reviews, and active listings. Methodology published, no pay-to-rank. View Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ### Related Compounds View All (https://www.bodyhackguide.co/wiki) ### AOD-9604 Metabolic & Weight Loss Phase 3 AOD-9604 (Anti-Obesity Drug 9604) is a synthetic 16-amino-acid peptide fragment of human growth hormone (hGH) corresponding to residues 177-191 of the hGH molecule plus a tyrosine addition at the N-terminus (sequence: Tyr-Leu-Arg-Ile-Val-Gln-Cys-Arg-Ser-Val-Glu-Gly-Ser-Cys-Gly-Phe). t½ ~30–60 minutes 250–600 mcg per injection 1 PubMed View Profile https://www.bodyhackguide.co/compound/aod-9604 ### ATX-304 Metabolic & Weight Loss Phase IIa Clinical Trials ATX-304 (also known as O-304) is an orally bioavailable, first-in-class pan-AMPK activator with a mild mitochondrial-uncoupling effect. Preclinical View Profile https://www.bodyhackguide.co/compound/atx-304 ### Cagrilintide Metabolic & Weight Loss Phase 3 Cagrilintide (also known as AM833, development code NN9838) is a long-acting amylin analog developed by Novo Nordisk as a next-generation weight-management therapy, designed to be co-administered with the GLP-1 receptor agonist semaglutide in a fixed-ratio combination known as CagriSema. t½ ~159 hours (approximately 7 days) 46 PubMed View Profile https://www.bodyhackguide.co/compound/cagrilintide ### HGH Fragment 176-191 Metabolic & Weight Loss Phase 2 HGH Fragment 176-191 (also written HGH Frag 176-191, hGH Fragment 176-191, and frequently appearing in clinical literature as AOD-9604 — "Anti-Obesity Drug 9604") is a synthetic peptide corresponding to the C-terminal 15-amino-acid region of the 191-amino-acid human growth hormone (hGH) molecule, with an additional N-terminal tyrosine residue added for stability and biological activity. t½ ~30 minutes (short plasma half-life) 250-500 mcg 2 PubMed View Profile https://www.bodyhackguide.co/compound/hgh-frag-176-191 ### Retatrutide Metabolic & Weight Loss Phase 3 Retatrutide (also coded LY3437943) is an investigational once-weekly triple-agonist at the GLP-1, GIP, and glucagon receptors. t½ ~6 days (plasma, albumin-bound) 1,000–12,000 mcg (1–12 mg) per week 135 PubMed View Profile https://www.bodyhackguide.co/compound/retatrutide ### Semaglutide Metabolic & Weight Loss FDA Approved Semaglutide is a glucagon-like peptide-1 receptor agonist (GLP-1 RA) with a molecular weight of 4113.58 Da and CAS number 910463-68-2. t½ ~7 days (168 hours), enabled by C18 fatty diacid albumin-binding modification Diabetes (Ozempic): 250-1000 mcg weekly; Weight management (Wegovy): 2400 mcg weekly (after 16-week titration); Oral (Rybelsus): 3-14 mg daily 3,273 PubMed View Profile https://www.bodyhackguide.co/compound/semaglutide ### Side-by-Side Comparisons All Comparisons (https://www.bodyhackguide.co/compare) Tirzepatide vs Retatrutide: https://www.bodyhackguide.co/compare/retatrutide-vs-tirzepatide Tirzepatide vs Semaglutide: https://www.bodyhackguide.co/compare/tirzepatide-vs-semaglutide Tirzepatide vs Mazdutide: https://www.bodyhackguide.co/compare/mazdutide-vs-tirzepatide Tirzepatide vs AOD-9604: https://www.bodyhackguide.co/compare/aod-9604-vs-tirzepatide Tirzepatide vs 5-Amino-1MQ: https://www.bodyhackguide.co/compare/5-amino-1mq-vs-tirzepatide View Full Dosage Guide → Protocols, calculator & safety for Tirzepatide https://www.bodyhackguide.co/guides/dosage/tirzepatide ### Related Articles All Posts (https://www.bodyhackguide.co/blog) #### The 8 Best Peptide Companies for Research: 2026 Purity & Price Comparison A data-driven comparison of every active peptide vendor we track: COA audit results, price-per-mg tables for 19 compounds, and a step-by-step purchase guide. 9/16/2026 https://www.bodyhackguide.co/blog/best-peptide-companies-2026 #### Myostatin: The Muscle Brake, the Inhibitors, and What Actually Works (2026) Myostatin is your body's brake on muscle growth. The famous mutations, the inhibitor drugs (apitegromab, bimagrumab) and their honest trial record, the supplement hype, and how to keep muscle on a GLP-1. 7/9/2026 https://www.bodyhackguide.co/blog/myostatin-and-muscle #### Aquasome Nanotechnology and Oral Peptides: The Mechanism, the Research, and the 10 Compounds It Actually Works For how aquasome 3-layer nano-encapsulation lets peptides like retatrutide, bpc-157, and tb-500 survive the gut. pubmed-backed deep dive on the 10 compounds it works for. 5/20/2026 https://www.bodyhackguide.co/blog/aqasome-nanotechnology-oral-peptides ### Featured Price ⚗️ ResearchChemHQ $299.99($5.00/mg) 6 vendors · 17 listings ### Research Score 100 626 PubMed results ### Quality Indicators Data Completeness 100% Description Mechanism of Action Chemical Data Dosing Protocols Safety Profile PubMed Results Interactions Vendor Listings COA Verification 10 Verified COAs 2 Vendors w/ COA High verification rate (83%) Latest test: 3/1/2026 Research Volume 626 PubMed results Well-researched compound ### Quick Facts Half-Life Molecular Weight 4813.49 g/mol Administration Subcutaneous (weekly) CAS Number 2023788-19-2 Trial Phase FDA Approved ### Safety Profile Common Side Effects - • Nausea (most common, 24-33% depending on dose, typically transient) - • Diarrhea (17-23%) - • Vomiting (6-13%, more common during titration) - • Decreased appetite (considered both effect and side effect) - • Constipation (6-11%) - • Injection site reactions (3-7%) Research Disclaimer This information is for educational and research purposes only. Not intended as medical advice. Consult a healthcare professional before use. ## Frequently Asked Questions How is tirzepatide dosed? Tirzepatide is a once-weekly subcutaneous injection. The label starts everyone at 2.5 mg for the first four weeks (a tolerance dose, not a therapeutic one), then steps up to 5 mg, and can climb by 2.5 mg every four weeks up to a 15 mg maximum. Most people settle at the lowest dose that keeps working. There is a free tirzepatide dosage calculator on this site that converts any dose to syringe units. Tirzepatide vs semaglutide: which is stronger? Tirzepatide hits two receptors (GIP and GLP-1); semaglutide hits one (GLP-1). In the head-to-head trials, tirzepatide produced more weight loss and larger HbA1c drops. That does not make it right for everyone, but on raw efficacy it tends to win. How long does a tirzepatide vial last? Divide the vial size by your weekly dose. A 10 mg vial at 2.5 mg per week lasts about four weeks; at 5 mg per week, two. Reconstituted tirzepatide keeps roughly four to eight weeks refrigerated, so match the vial size to your dose. ## Research Tools ### Peptide Calculator Reconstitution & syringe units https://www.bodyhackguide.co/tools/reconstitution ### Reconstitution Guide How to mix, step by step https://www.bodyhackguide.co/guides/how-to-reconstitute-peptides ### Nasal Spray Calc mL per actuation https://www.bodyhackguide.co/tools/intranasal ### Half-Life Visualizer Decay curves https://www.bodyhackguide.co/tools/halflife ## Related Compounds ### AOD-9604 Metabolic & Weight Loss Phase 3 ### ATX-304 ### Cagrilintide Metabolic & Weight Loss Phase 3 t½ ~159 hours (approximately 7 days) ### HGH Fragment 176-191 Metabolic & Weight Loss Phase 2 ### Retatrutide Metabolic & Weight Loss Phase 3 ### Semaglutide Metabolic & Weight Loss FDA Approved ## Side-by-Side Comparisons Compare Tirzepatide head-to-head: mechanism, half-life, dosing, safety, and vendor prices. Free 2026 Peptide Cheat Sheet (PDF) 38 compounds and blends: vial sizes, BAC water volumes, dosing ranges and bloodwork markers. Download Free (https://www.bodyhackguide.co/guides/peptide-cheat-sheet-download) ### Need bloodwork before starting? Full hormone + metabolic panels from Anabolic Insights. Code CHONCH for first-order discount. Image: BodyHackGuide (https://www.bodyhackguide.co/assets/bodyhackguide-logo-DOzZNUyh.webp) ### BodyHackGuide Your biohacking research hub: compound pricing, brain health protocols, dosing tools, and vendor reviews. support@bodyhackguide.co Join our Discord: https://discord.gg/Mhq5UdRYBA r/BodyHackGuide on Reddit: https://reddit.com/r/BodyHackGuide #### Explore - Compare prices: https://www.bodyhackguide.co/compare - Vendors: https://www.bodyhackguide.co/vendors - Deals: https://www.bodyhackguide.co/deals - Coupons: https://www.bodyhackguide.co/coupons - Nootropics: https://www.bodyhackguide.co/nootropics - Brain health: https://www.bodyhackguide.co/brain-health - Blog: https://www.bodyhackguide.co/blog - Guides: https://www.bodyhackguide.co/guides #### Tools - Reconstitution: https://www.bodyhackguide.co/tools/reconstitution - Half-life visualizer: https://www.bodyhackguide.co/tools/halflife - COA reader: https://www.bodyhackguide.co/tools/coa - Cost calculator: https://www.bodyhackguide.co/tools/cost-calculator - Stack builder: https://www.bodyhackguide.co/stack-builder - All tools: https://www.bodyhackguide.co/tools #### Trust & vendors - Vendor directory: https://www.bodyhackguide.co/vendors - Trust scorecard: https://www.bodyhackguide.co/vendors/scorecard - Vendor trust badge: https://www.bodyhackguide.co/vendors/get-vetted - Scoring methodology: https://www.bodyhackguide.co/vendors/methodology - Peptide cheat sheet: https://www.bodyhackguide.co/guides/peptide-cheat-sheet-download #### Company - About: https://www.bodyhackguide.co/about - Affiliate disclosure: https://www.bodyhackguide.co/affiliate-disclosure - Editorial standards: https://www.bodyhackguide.co/editorial-standards - Creators: https://www.bodyhackguide.co/creators - Coaches: https://www.bodyhackguide.co/coaches - 1-on-1 coaching: https://www.bodyhackguide.co/coaching - Privacy: https://www.bodyhackguide.co/privacy - Terms: https://www.bodyhackguide.co/terms - Full site directory: https://www.bodyhackguide.co/site-directory **Affiliate Disclosure:** We rank every vendor on the same public, reproducible methodology (https://www.bodyhackguide.co/vendors/methodology), and we earn a commission from purchases made through some of our links at no extra cost to you. 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All rights reserved. · Terms (https://www.bodyhackguide.co/terms) · Privacy (https://www.bodyhackguide.co/privacy) ## Structured data ```json [ { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co/" }, { "@type": "ListItem", "position": 2, "name": "Compounds", "item": "https://www.bodyhackguide.co/compare" }, { "@type": "ListItem", "position": 3, "name": "Tirzepatide" } ] }, { "@context": "https://schema.org", "@type": "Product", "name": "Tirzepatide", "description": "Tirzepatide is a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist with a molecular weight of 4813.45 Da and CAS number 2023788-19-2. It is a 39-amino-acid synthetic peptide based on the native GIP sequence with modifications that confer activity at both GIP and GLP-1 receptors. Tirzepatide features a C20 fatty diacid moiety attached via a linker to facilitate albumin binding, resulting in a plasma half-life of approximately 5 days that supports once-weekly subcutaneous dosing. Tirzepatide is FDA-approved under two brand names: Mounjaro (for type 2 diabetes mellitus, approved May 2022) and Zepbound (for chronic weight management, approved November 2023). It is manufactured by Eli Lilly and Company and represents the first-in-class dual GIP/GLP-1 receptor agonist to reach the market. The SURMOUNT clinical trial program established tirzepatide as the most effective pharmacological weight loss agent to date. In the SURMOUNT-1 trial, participants with obesity or overweight (without diabetes) receiving tirzepatide 15 mg weekly achieved a mean body weight reduction of 22.5% from baseline at 72 weeks, compared to 2.4% with placebo — a treatment difference of 20.1 percentage points. Notably, 36.2% of participants in the 15 mg group achieved 25% or greater total body weight loss, approaching the magnitude historically seen only with bariatric surgery (PMID: 35658024). The SURMOUNT-2 trial evaluated tirzepatide in adults with type 2 diabetes and obesity, demonstrating mean weight loss of 14.7% with tirzepatide 15 mg versus 3.2% with placebo at 72 weeks, along with significant HbA1c improvement. The SURMOUNT-3 trial studied tirzepatide following an intensive 12-week lifestyle intervention, showing that tirzepatide maintained and extended initial weight loss while placebo recipients regained weight (PMID: 37840095). A key differentiating feature of tirzepatide compared to pure GLP-1 receptor agonists such as semaglutide is the GIP receptor agonist component. GIP signaling in adipose tissue is proposed to improve lipid metabolism and may protect against the loss of lean body mass that accompanies caloric restriction and weight loss. Preclinical and early clinical data suggest that tirzepatide-treated patients lose a greater proportion of fat mass relative to lean mass compared to GLP-1-only agents, though this finding requires further validation in dedicated body composition studies. Tirzepatide achieved the highest absolute weight loss of any anti-obesity medication in clinical trials. At the 15 mg dose, mean absolute weight loss was approximately 24 kg (52 lbs) at 72 weeks in SURMOUNT-1. 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It is a 39-amino-acid synthetic peptide based on the native GIP sequence with modifications that confer activity at both GIP and GLP-1 receptors. Tirzepatide features a C20 fatty diacid moiety attached via a linker to facilitate albumin binding, resulting in a plasma half-life of approximately 5 days that supports once-weekly subcutaneous dosing. Tirzepatide is FDA-approved under two brand names: Mounjaro (for type 2 diabetes mellitus, approved May 2022) and Zepbound (for chronic weight management, approved November 2023). It is manufactured by Eli Lilly and Company and represents the first-in-class dual GIP/GLP-1 receptor agonist to reach the market. The SURMOUNT clinical trial program established tirzepatide as the most effective pharmacological weight loss agent to date. In the SURMOUNT-1 trial, participants with obesity or overweight (without diabetes) receiving tirzepatide 15 mg weekly achieved a mean body weight reduction of 22.5% from baseline at 72 weeks, compared to 2.4% with placebo — a treatment difference of 20.1 percentage points. Notably, 36.2% of participants in the 15 mg group achieved 25% or greater total body weight loss, approaching the magnitude historically seen only with bariatric surgery (PMID: 35658024). The SURMOUNT-2 trial evaluated tirzepatide in adults with type 2 diabetes and obesity, demonstrating mean weight loss of 14.7% with tirzepatide 15 mg versus 3.2% with placebo at 72 weeks, along with significant HbA1c improvement. The SURMOUNT-3 trial studied tirzepatide following an intensive 12-week lifestyle intervention, showing that tirzepatide maintained and extended initial weight loss while placebo recipients regained weight (PMID: 37840095). A key differentiating feature of tirzepatide compared to pure GLP-1 receptor agonists such as semaglutide is the GIP receptor agonist component. GIP signaling in adipose tissue is proposed to improve lipid metabolism and may protect against the loss of lean body mass that accompanies caloric restriction and weight loss. Preclinical and early clinical data suggest that tirzepatide-treated patients lose a greater proportion of fat mass relative to lean mass compared to GLP-1-only agents, though this finding requires further validation in dedicated body composition studies. Tirzepatide achieved the highest absolute weight loss of any anti-obesity medication in clinical trials. At the 15 mg dose, mean absolute weight loss was approximately 24 kg (52 lbs) at 72 weeks in SURMOUNT-1. The gastrointestinal side effect profile is similar to GLP-1 receptor agonists, with nausea being the most common adverse event, generally mild to moderate and diminishing over time with dose titration.", "lastReviewed": "2026-05-04T11:35:33.449+00:00", "url": "https://www.bodyhackguide.co/compound/tirzepatide", "author": { "@type": "Person", "name": "BioChonch", "url": "https://www.bodyhackguide.co/about", "jobTitle": "Founder & Lead Researcher", "sameAs": [ "https://reddit.com/r/BodyHackGuide", "https://reddit.com/r/BrainHackGuide", "https://reddit.com/r/Biohackingher" ], "worksFor": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" } }, "reviewedBy": { "@type": "Person", "name": "BioChonch", "url": "https://www.bodyhackguide.co/about", "jobTitle": "Founder & Lead Researcher", "sameAs": [ "https://reddit.com/r/BodyHackGuide", "https://reddit.com/r/BrainHackGuide", "https://reddit.com/r/Biohackingher" ], "worksFor": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" } }, "publisher": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" }, "mainContentOfPage": { "@type": "WebPageElement", "cssSelector": "main" }, "about": { "@type": "Drug", "name": "Tirzepatide", "alternateName": [ "GLP-2T", "GIP/GLP-1", "ION-2T", "GLP-2", "Tirzepatide", "PEP-2T", "RC-2T", "Dual Agonist", "Ion Peptide Tirzepatide", "Tirz", "GIP/GLP" ], "description": "Tirzepatide is a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist with a molecular weight of 4813.45 Da and CAS number 2023788-19-2. It is a 39-amino-acid synthetic peptide based on the native GIP sequence with modifications that confer activity at both GIP and GLP-1 receptors. Tirzepatide features a C20 fatty diacid moiety attached via a linker to facilitate albumin binding, resulting in a plasma half-life of approximately 5 days that supports once-weekly subcutaneous dosing. Tirzepatide is FDA-approved under two brand names: Mounjaro (for type 2 diabetes mellitus, approved May 2022) and Zepbound (for chronic weight management, approved November 2023). It is manufactured by Eli Lilly and Company and represents the first-in-class dual GIP/GLP-1 receptor agonist to reach the market. The SURMOUNT clinical trial program established tirzepatide as the most effective pharmacological weight loss agent to date. In the SURMOUNT-1 trial, participants with obesity or overweight (without diabetes) receiving tirzepatide 15 mg weekly achieved a mean body weight reduction of 22.5% from baseline at 72 weeks, compared to 2.4% with placebo — a treatment difference of 20.1 percentage points. Notably, 36.2% of participants in the 15 mg group achieved 25% or greater total body weight loss, approaching the magnitude historically seen only with bariatric surgery (PMID: 35658024). The SURMOUNT-2 trial evaluated tirzepatide in adults with type 2 diabetes and obesity, demonstrating mean weight loss of 14.7% with tirzepatide 15 mg versus 3.2% with placebo at 72 weeks, along with significant HbA1c improvement. The SURMOUNT-3 trial studied tirzepatide following an intensive 12-week lifestyle intervention, showing that tirzepatide maintained and extended initial weight loss while placebo recipients regained weight (PMID: 37840095). A key differentiating feature of tirzepatide compared to pure GLP-1 receptor agonists such as semaglutide is the GIP receptor agonist component. GIP signaling in adipose tissue is proposed to improve lipid metabolism and may protect against the loss of lean body mass that accompanies caloric restriction and weight loss. Preclinical and early clinical data suggest that tirzepatide-treated patients lose a greater proportion of fat mass relative to lean mass compared to GLP-1-only agents, though this finding requires further validation in dedicated body composition studies. Tirzepatide achieved the highest absolute weight loss of any anti-obesity medication in clinical trials. At the 15 mg dose, mean absolute weight loss was approximately 24 kg (52 lbs) at 72 weeks in SURMOUNT-1. The gastrointestinal side effect profile is similar to GLP-1 receptor agonists, with nausea being the most common adverse event, generally mild to moderate and diminishing over time with dose titration.", "activeIngredient": "Tirzepatide", "administrationRoute": "Subcutaneous (weekly)", "mechanismOfAction": "Dual GLP-1 and GIP Receptor Agonism Tirzepatide simultaneously activates two incretin receptors: the GLP-1 receptor and the GIP receptor. While the GLP-1 receptor component provides the well-established effects of GLP-1 agonism (glucose-dependent insulin secretion, glucagon suppression, appetite reduction, delayed gastric emptying), the GIP receptor component adds complementary metabolic effects. GIP receptor activation on pancreatic beta cells enhances glucose-stimulated insulin secretion through a cAMP-PKA pathway that is additive with GLP-1R signaling (PMID: 35658024). Tirzepatide has approximately 5-fold selectivity for the GIP receptor over the GLP-1 receptor, making it a GIP-biased dual agonist. Enhanced Insulin Secretion Through Dual Incretin Signaling The combination of GLP-1R and GIPR agonism produces greater insulin secretory response than either pathway alone. In pancreatic beta cells, GLP-1 and GIP activate distinct but converging intracellular signaling cascades — both increase cAMP but through different receptor-G-protein coupling kinetics. This dual stimulation enhances first-phase and second-phase insulin secretion, improving postprandial glucose control. Tirzepatide also suppresses glucagon secretion from alpha cells, contributing to lower fasting and postprandial glucose levels. In SURPASS trials for type 2 diabetes, tirzepatide 15 mg reduced HbA1c by up to 2.58% from a baseline of approximately 8.3%. Adipose Tissue Lipid Metabolism via GIP Receptor GIP receptors are expressed on white adipocytes, and their activation promotes lipid uptake, lipogenesis, and adipose tissue remodeling. While this may seem counterintuitive for a weight loss drug, the current hypothesis is that GIP receptor agonism in the context of an energy deficit promotes healthier adipose tissue function — improving lipid storage in subcutaneous depots (metabolically favorable) rather than visceral or ectopic fat depots. This mechanism may explain the observation that tirzepatide produces favorable body composition changes, with proportionally greater fat mass loss relative to lean mass loss compared to GLP-1-only agents (PMID: 35658024). Central Appetite Suppression Like semaglutide, tirzepatide acts on hypothalamic and brainstem GLP-1 receptors to reduce appetite. Additionally, GIP receptors are expressed in the central nervous system, including the hypothalamus. Preclinical evidence suggests that central GIPR agonism modulates food intake through pathways partially distinct from GLP-1R signaling, potentially contributing to the greater weight loss observed with dual agonism. Participants in SURMOUNT-1 reported significant reductions in hunger, food cravings, and portion sizes (PMID: 35658024). Gastric Emptying Delay Tirzepatide slows gastric emptying, contributing to post-meal satiety and reduced caloric intake. However, the degree of gastric emptying delay with tirzepatide may be slightly less than with pure GLP-1 agonists at equivalent weight loss levels, potentially contributing to slightly better gastrointestinal tolerability in some patients.", "dosageForm": "vial", "legalStatus": "Not approved for human use (research chemical)", "warning": "For research purposes only. Not for human consumption." } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How is tirzepatide dosed?", "acceptedAnswer": { "@type": "Answer", "text": "Tirzepatide is a once-weekly subcutaneous injection. The label starts everyone at 2.5 mg for the first four weeks (a tolerance dose, not a therapeutic one), then steps up to 5 mg, and can climb by 2.5 mg every four weeks up to a 15 mg maximum. Most people settle at the lowest dose that keeps working. There is a free tirzepatide dosage calculator on this site that converts any dose to syringe units." } }, { "@type": "Question", "name": "Tirzepatide vs semaglutide: which is stronger?", "acceptedAnswer": { "@type": "Answer", "text": "Tirzepatide hits two receptors (GIP and GLP-1); semaglutide hits one (GLP-1). In the head-to-head trials, tirzepatide produced more weight loss and larger HbA1c drops. That does not make it right for everyone, but on raw efficacy it tends to win." } }, { "@type": "Question", "name": "How long does a tirzepatide vial last?", "acceptedAnswer": { "@type": "Answer", "text": "Divide the vial size by your weekly dose. A 10 mg vial at 2.5 mg per week lasts about four weeks; at 5 mg per week, two. Reconstituted tirzepatide keeps roughly four to eight weeks refrigerated, so match the vial size to your dose." } } ] }, { "@context": "https://schema.org", "@type": "Organization", "@id": "https://www.bodyhackguide.co#organization", "name": "BodyHackGuide", "alternateName": "BHG", "url": "https://www.bodyhackguide.co", "logo": { "@type": "ImageObject", "url": "https://www.bodyhackguide.co/logo.png", "width": 512, "height": 512 }, "description": "Evidence-based research reference for peptides and nootropics. 124+ compound profiles, interactive dosing calculators, vendor price comparisons, and trust-scored vendor reviews scored on a public, reproducible methodology applied to every vendor. 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