--- title: "T3/T4 Thyroid Blend Dosage Guide [2026] — BodyHackGuide" description: "Complete T3/T4 Thyroid Blend dosage guide with protocols, calculator, safety info, and where to buy. Updated for 2026." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Article", "headline": "T3/T4 Thyroid Blend Dosage Guide [2026]", "description": "Complete T3/T4 Thyroid Blend dosage guide with protocols, calculator, safety info, and where to buy. Updated for 2026.", "author": { "@type": "Person", "name": "BioChonch", "url": "https://www.bodyhackguide.co/about", "jobTitle": "Founder & Lead Researcher", "sameAs": [ "https://x.com/bodyhackguide", "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://x.com/bodyhackguide", "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", "logo": { "@type": "ImageObject", "url": "https://www.bodyhackguide.co/bhglogo.png" } } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is the recommended T3/T4 Thyroid Blend dosage?", "acceptedAnswer": { "@type": "Answer", "text": "The typical dose range for T3/T4 Thyroid Blend is Component-split and physician-set, not a fixed self-dose: T4 (levothyroxine) approximately 75-150 mcg/day and T3 (liothyronine) approximately 5-20 mcg/day divided - both titrated to labs (TSH, free T4, free T3), individualized by weight, age and cardiac status. Not a self-dosing recommendation.. It is usually administered Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks.. Always start with the lowest effective dose." } }, { "@type": "Question", "name": "How often should I take T3/T4 Thyroid Blend?", "acceptedAnswer": { "@type": "Answer", "text": "Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks." } }, { "@type": "Question", "name": "Does T3/T4 Thyroid Blend need to be cycled?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, typical cycle length is Not a 'cycle' drug. Thyroid replacement for genuine hypothyroidism is typically lifelong and continuous, adjusted to labs - not run in on/off cycles. The on/off 'cycling' seen in gray-market fat-loss use is a misuse pattern that risks thyrotoxicosis on and rebound hypothyroid symptoms off; it is not endorsed.." } }, { "@type": "Question", "name": "What are T3/T4 Thyroid Blend side effects?", "acceptedAnswer": { "@type": "Answer", "text": "Nearly all serious effects come from too much thyroid hormone (over-replacement / thyrotoxicosis), and the T3 component makes overshoot easier because it acts fast and potently. Cardiac: palpitations, tachycardia, new or worsened atrial fibrillation, angina, and increased cardiac workload; a suppressed TSH is independently linked to higher atrial fibrillation risk [PMID:33543160] [PMID:23873176]. Skeletal: accelerated bone turnover and loss of bone mineral density with increased fracture risk - especially hip and spine - when TSH is suppressed, shown in a pooled analysis of roughly 70,000 participants [PMID:26010634] [PMID:22561612]. Metabolic/general: heat intolerance, sweating, unwanted weight loss, tremor, anxiety, insomnia, diarrhea, menstrual changes and muscle weakness. Risks are higher in older adults and anyone with heart disease. Post-dose T3 peaks from the liothyronine component can cause transient palpitations even at an 'average' daily total. Under-dosing simply leaves hypothyroid symptoms uncorrected." } }, { "@type": "Question", "name": "Where can I buy T3/T4 Thyroid Blend?", "acceptedAnswer": { "@type": "Answer", "text": "Visit our vendor directory to find trusted sources for T3/T4 Thyroid Blend." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co/" }, { "@type": "ListItem", "position": 2, "name": "Guides", "item": "https://www.bodyhackguide.co/guides" }, { "@type": "ListItem", "position": 3, "name": "Dosage Guides", "item": "https://www.bodyhackguide.co/guides" }, { "@type": "ListItem", "position": 4, "name": "T3/T4 Thyroid Blend Dosage", "item": "https://www.bodyhackguide.co/guides/dosage/t3-t4-blend" } ] }, { "@context": "https://schema.org", "@type": "Article", "headline": "T3/T4 Thyroid Blend Dosage Guide [2026]", "description": "Complete T3/T4 Thyroid Blend dosage guide with protocols, calculator, safety info, and where to buy. Updated for 2026.", "author": { "@type": "Person", "name": "BioChonch", "url": "https://www.bodyhackguide.co/about", "jobTitle": "Founder & Lead Researcher", "sameAs": [ "https://x.com/bodyhackguide", "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://x.com/bodyhackguide", "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", "logo": { "@type": "ImageObject", "url": "https://www.bodyhackguide.co/bhglogo.png" } } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is the recommended T3/T4 Thyroid Blend dosage?", "acceptedAnswer": { "@type": "Answer", "text": "The typical dose range for T3/T4 Thyroid Blend is Component-split and physician-set, not a fixed self-dose: T4 (levothyroxine) approximately 75-150 mcg/day and T3 (liothyronine) approximately 5-20 mcg/day divided - both titrated to labs (TSH, free T4, free T3), individualized by weight, age and cardiac status. Not a self-dosing recommendation.. It is usually administered Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks.. Always start with the lowest effective dose." } }, { "@type": "Question", "name": "How often should I take T3/T4 Thyroid Blend?", "acceptedAnswer": { "@type": "Answer", "text": "Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks." } }, { "@type": "Question", "name": "Does T3/T4 Thyroid Blend need to be cycled?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, typical cycle length is Not a 'cycle' drug. Thyroid replacement for genuine hypothyroidism is typically lifelong and continuous, adjusted to labs - not run in on/off cycles. The on/off 'cycling' seen in gray-market fat-loss use is a misuse pattern that risks thyrotoxicosis on and rebound hypothyroid symptoms off; it is not endorsed.." } }, { "@type": "Question", "name": "What are T3/T4 Thyroid Blend side effects?", "acceptedAnswer": { "@type": "Answer", "text": "Nearly all serious effects come from too much thyroid hormone (over-replacement / thyrotoxicosis), and the T3 component makes overshoot easier because it acts fast and potently. Cardiac: palpitations, tachycardia, new or worsened atrial fibrillation, angina, and increased cardiac workload; a suppressed TSH is independently linked to higher atrial fibrillation risk [PMID:33543160] [PMID:23873176]. Skeletal: accelerated bone turnover and loss of bone mineral density with increased fracture risk - especially hip and spine - when TSH is suppressed, shown in a pooled analysis of roughly 70,000 participants [PMID:26010634] [PMID:22561612]. Metabolic/general: heat intolerance, sweating, unwanted weight loss, tremor, anxiety, insomnia, diarrhea, menstrual changes and muscle weakness. Risks are higher in older adults and anyone with heart disease. Post-dose T3 peaks from the liothyronine component can cause transient palpitations even at an 'average' daily total. Under-dosing simply leaves hypothyroid symptoms uncorrected." } }, { "@type": "Question", "name": "Where can I buy T3/T4 Thyroid Blend?", "acceptedAnswer": { "@type": "Answer", "text": "Visit our vendor directory to find trusted sources for T3/T4 Thyroid Blend." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co/" }, { "@type": "ListItem", "position": 2, "name": "Guides", "item": "https://www.bodyhackguide.co/guides" }, { "@type": "ListItem", "position": 3, "name": "Dosage Guides", "item": "https://www.bodyhackguide.co/guides" }, { "@type": "ListItem", "position": 4, "name": "T3/T4 Thyroid Blend Dosage", "item": "https://www.bodyhackguide.co/guides/dosage/t3-t4-blend" } ] } ] --- [Skip to content](#main-content) ## Research Use Only This site is an **educational resource** for research compounds. We do **not endorse** human consumption of any compound. BodyHackGuide and **BHG Labs share common ownership**; we rank every vendor on the same public methodology, and we earn a commission on purchases through our links. By entering, you confirm you are **21 years of age or older** and agree to our [Terms](/terms) & [Privacy Policy](/privacy). I'm 21+ — Enter SiteLeave site [![BodyHackGuide](/assets/bodyhackguide-logo-DOzZNUyh.webp)BodyHackGuide ](/) [Compare](/compare)[Wiki](/wiki)[Vendors](/vendors)[Deals](/deals)[Stacks](/stack-builder)[Nootropics](/nootropics)[Tools](/tools) Learn Community Search ⌘K [Sign In](/auth?returnTo=%2Fguides%2Fdosage%2Ft3-t4-blend) 100K+ researchers trust BodyHackGuide — Join [r/BodyHackGuide](https://reddit.com/r/bodyhackguide) 1. [Home](/) 3. [Guides](/guides) 5. Dosage 7. T3/T4 Thyroid Blend Hormone Support Components are FDA-approved prescription drugs (levothyroxine and liothyronine); the fixed-ratio synthetic T3/T4 combination product is investigational/unapproved as sold and is framed here strictly for research use only (RUO). # T3/T4 Thyroid Blend Dosage Guide: Protocols, Calculator & Safety Everything you need to know about T3/T4 Thyroid Blend dosing — protocols, safety, and where to buy. Dose Range Component-split and physician-set, not a fixed self-dose: T4 (levothyroxine) approximately 75-150 mcg/day and T3 (liothyronine) approximately 5-20 mcg/day divided - both titrated to labs (TSH, free T4, free T3), individualized by weight, age and cardiac status. Not a self-dosing recommendation. Frequency Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks. Cycle Length Not a 'cycle' drug. Thyroid replacement for genuine hypothyroidism is typically lifelong and continuous, adjusted to labs - not run in on/off cycles. The on/off 'cycling' seen in gray-market fat-loss use is a misuse pattern that risks thyrotoxicosis on and rebound hypothyroid symptoms off; it is not endorsed. Half-Life T4 (levothyroxine): approximately 6-7 days in euthyroid adults (longer in hypothyroid, shorter in hyperthyroid states). T3 (liothyronine): approximately 1 day (~18-24 hours), which is why T3 is dosed multiple times daily or as a slow-release preparation. [ Dosage Calculator Calculate exact dosing for T3/T4 Thyroid Blend. ](/tools/dosage) ## Dosing Protocols Beginner There is no safe 'beginner' self-start for thyroid hormone. Thyroid hormones are not supplements - they are potent prescription drugs with a narrow therapeutic window. The only appropriate first step is diagnostic, not pharmacologic: a clinician-ordered thyroid panel (TSH, free T4, and often free T3 and TPO antibodies) to confirm whether a real deficiency exists. Thyroid symptoms (fatigue, weight change, brain fog) overlap with dozens of other conditions, and dosing thyroid hormone into a normal thyroid causes harm, not benefit. If replacement is genuinely indicated, standard practice starts with levothyroxine (T4) alone - not a T3/T4 blend - at a physician-calculated, weight-based dose, with labs rechecked in 6-8 weeks before any change \[PMID:25266247\]. Adding T3 is a second-line specialist decision, never a starting point. Standard 'Intermediate' here means physician-supervised combination therapy in a diagnosed, already-treated hypothyroid patient who remains symptomatic on levothyroxine despite a normal TSH - the only population where a T3/T4 approach is even reasonable \[PMID:33276704\]. In that supervised setting, clinicians typically keep the levothyroxine (T4) dose the same or slightly reduced and add a SMALL amount of liothyronine (T3), aiming to approximate the roughly 13-14:1 T4:T3 ratio of native thyroid secretion - not the roughly 4:1 ratio of desiccated extract, which over-delivers T3. Because liothyronine is short-acting, it is split into two or more daily doses (or a slow-release form is used) to avoid post-dose T3 spikes \[PMID:37738506\]. TSH, free T4 and free T3 are rechecked and the dose is titrated to keep all in range. This is a titration-to-labs process run by a prescriber, not a fixed self-administered 'stack.' Advanced There is no legitimate 'advanced' recreational or performance protocol for a T3/T4 blend. The main gray-market users are physique/bodybuilding communities using T3 (sometimes with T4) to accelerate fat loss - a practice that deliberately induces thyrotoxicosis and is genuinely dangerous: it drives muscle-protein loss alongside fat, tachycardia and atrial fibrillation, cardiac hypertrophy, and accelerated bone loss with higher fracture risk, and abrupt discontinuation can leave the person transiently hypothyroid while the HPT axis recovers \[PMID:26010634\] \[PMID:22561612\] \[PMID:33543160\]. None of this is endorsed here. The genuinely advanced version of this topic is medical: a thyroidologist managing a difficult-to-treat patient (e.g., a suspected under-converter, post-thyroidectomy, or someone in a monitored trial of slow-release T3), always with lab surveillance and cardiac/bone risk assessment \[PMID:33276704\]. ## Side Effects & Safety Nearly all serious effects come from too much thyroid hormone (over-replacement / thyrotoxicosis), and the T3 component makes overshoot easier because it acts fast and potently. Cardiac: palpitations, tachycardia, new or worsened atrial fibrillation, angina, and increased cardiac workload; a suppressed TSH is independently linked to higher atrial fibrillation risk \[PMID:33543160\] \[PMID:23873176\]. Skeletal: accelerated bone turnover and loss of bone mineral density with increased fracture risk - especially hip and spine - when TSH is suppressed, shown in a pooled analysis of roughly 70,000 participants \[PMID:26010634\] \[PMID:22561612\]. Metabolic/general: heat intolerance, sweating, unwanted weight loss, tremor, anxiety, insomnia, diarrhea, menstrual changes and muscle weakness. Risks are higher in older adults and anyone with heart disease. Post-dose T3 peaks from the liothyronine component can cause transient palpitations even at an 'average' daily total. Under-dosing simply leaves hypothyroid symptoms uncorrected. Contraindications Do not use without a diagnosed, lab-confirmed indication and medical supervision. Specific high-risk situations: untreated adrenal insufficiency (thyroid hormone can precipitate adrenal crisis - cortisol status must be addressed first); recent myocardial infarction or acute cardiac events; uncorrected thyrotoxicosis/hyperthyroidism; and known hypersensitivity. Extreme, specialist-managed caution in coronary artery disease, arrhythmia/atrial fibrillation, osteoporosis or high fracture risk, and in older adults. Not for weight loss, 'metabolism boosting,' bodybuilding cutting, or use by anyone with normal thyroid function. Pregnancy requires its own carefully monitored levothyroxine dosing (usually T4, not blends) - do not self-manage. Numerous drug and absorption interactions apply (see interactions). [Check interactions with the Interaction Checker →](/tools/interaction-checker) ## Additional Notes These figures describe supervised clinical prescribing and are provided for education, not as a protocol to self-administer. Thyroid hormone is dosed to blood tests (TSH, free T4, free T3), individualized by weight, age and cardiac status, and adjusted slowly. The T3 component narrows the safety margin - small absolute changes in liothyronine produce outsized effects. Any real human use requires a licensed prescriber and periodic labs. ## Frequently Asked Questions What is the recommended T3/T4 Thyroid Blend dosage? The typical dose range for T3/T4 Thyroid Blend is Component-split and physician-set, not a fixed self-dose: T4 (levothyroxine) approximately 75-150 mcg/day and T3 (liothyronine) approximately 5-20 mcg/day divided - both titrated to labs (TSH, free T4, free T3), individualized by weight, age and cardiac status. Not a self-dosing recommendation.. It is usually administered Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks.. Always start with the lowest effective dose. How often should I take T3/T4 Thyroid Blend? Levothyroxine (T4): once daily in the morning on an empty stomach. Liothyronine (T3): its short (~1 day) half-life means it is split into two or more daily doses, or given as a slow-release form, to avoid post-dose serum T3 peaks. Does T3/T4 Thyroid Blend need to be cycled? Yes, typical cycle length is Not a 'cycle' drug. Thyroid replacement for genuine hypothyroidism is typically lifelong and continuous, adjusted to labs - not run in on/off cycles. The on/off 'cycling' seen in gray-market fat-loss use is a misuse pattern that risks thyrotoxicosis on and rebound hypothyroid symptoms off; it is not endorsed.. What are T3/T4 Thyroid Blend side effects? Nearly all serious effects come from too much thyroid hormone (over-replacement / thyrotoxicosis), and the T3 component makes overshoot easier because it acts fast and potently. Cardiac: palpitations, tachycardia, new or worsened atrial fibrillation, angina, and increased cardiac workload; a suppressed TSH is independently linked to higher atrial fibrillation risk \[PMID:33543160\] \[PMID:23873176\]. Skeletal: accelerated bone turnover and loss of bone mineral density with increased fracture risk - especially hip and spine - when TSH is suppressed, shown in a pooled analysis of roughly 70,000 participants \[PMID:26010634\] \[PMID:22561612\]. Metabolic/general: heat intolerance, sweating, unwanted weight loss, tremor, anxiety, insomnia, diarrhea, menstrual changes and muscle weakness. Risks are higher in older adults and anyone with heart disease. Post-dose T3 peaks from the liothyronine component can cause transient palpitations even at an 'average' daily total. Under-dosing simply leaves hypothyroid symptoms uncorrected. Where can I buy T3/T4 Thyroid Blend? Visit our vendor directory to find trusted sources for T3/T4 Thyroid Blend. 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