--- title: "Rapamycin vs GHK-Cu: Side-by-Side Comparison (2026)" url: https://www.bodyhackguide.co/compare/rapamycin-vs-ghk-cu description: "Compare Rapamycin vs GHK-Cu side by side. We earn a commission on some vendor links. Mechanism, half-life, dose range, side effects and 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) # Rapamycin vs GHK-Cu Side-by-side comparison of Rapamycin and GHK-Cu: mechanism, half-life, dose range, safety profile, and vendor pricing. Rapamycin: no price on file GHK-Cu from $34.99 ## Price snapshot ### Rapamycin Current low — 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ### GHK-Cu Current low $34.99 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ## Rapamycin Rapamycin is a macrocyclic lactone antibiotic discovered in 1972 in soil samples from Rapa Nui (Easter Island) by a bacteriology survey team investigating indigenous Streptomyces species. Named after its place of… No vendor price on file. Full Rapamycin profile (https://www.bodyhackguide.co/compound/rapamycin) ## GHK-Cu GHK-Cu is the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine, a molecule Pickart and Thaler first pulled out of human plasma in 1973. The free peptide (GHK, C14H24N6O4) weighs about 340.4 Da; bind it 1:1… **Lowest listed price:** $34.99 across 7 listings Full GHK-Cu profile (https://www.bodyhackguide.co/compound/ghk-cu) ## Side-by-side comparison | Attribute | Rapamycin | GHK-Cu | | --- | --- | --- | | Category | Longevity | Skin, Hair & Aesthetics | | Research Stage | Preclinical | Approved/marketed as a topical cosmetic ingredient (Copper tripeptide-1) with supporting small human studies. Injectable use is preclinical/off-label, research-use-only, with no human clinical trials. | | Mechanism of Action | Rapamycin's mechanism of action centers on its inhibition of the mechanistic target of rapamycin (mTOR), a central serine-threonine kinase that integrates nutrient, growth factor, and stress signals to regulate cellular growth, protein synthesis, autophagy,… | GHK-Cu works mostly as a copper shuttle and a signaling peptide. It binds Cu(II) with high affinity (log K around 16.4, close to albumin's 16.2) and can supply or regulate copper for copper-dependent enzymes like SOD1, lysyl oxidase, cytochrome c oxidase, and… | | Half-Life | — | ~30-60 min (plasma; approximate legacy figure, no robust modern human PK study) | | Typical Dose Range | — | 200-500 mcg SC daily (community/RUO; no clinically established injectable dose) | | Dosing Frequency | — | Once daily subcutaneous; some run 5 days on / 2 days off. Topical: 1-2x daily to cleansed skin. | | Administration | — | Subcutaneous, Topical | | Side Effects | Rapamycin has a well-characterized side-effect profile developed over decades of transplant use. The profile at longevity doses (weekly 5-8 mg) is substantially milder than at transplant doses (continuous daily dosing targeting 5-15 ng/mL trough levels), but… | Topical GHK-Cu is generally well tolerated; higher-concentration formulations (4-5%) raise the odds of irritation, redness, or stinging. Injectable use has no safety data from controlled trials; the main theoretical concern is copper accumulation with repeated… | | Molecular Weight | — | Free peptide (GHK): 340.38 Da (C14H24N6O4). Copper complex (GHK-Cu): 401.9 Da (C14H22CuN6O4, neutral 1:1 Cu(II) complex). | | Common Vial Sizes | — | 50 mg, 100 mg | ## Price History 4 data points - OF - BM - Half Nattys - BHG Labs ### Rapamycin: potential benefits - No structured benefit list published. ### GHK-Cu: potential benefits - Stimulates type I collagen synthesis in human fibroblasts at low nanomolar-to-picomolar concentrations (PMID: 3169264) - Increases glycosaminoglycans (dermatan/chondroitin sulfate) and upregulates decorin in wound models (PMID: 11121126) - Modulates matrix metalloproteinases and their inhibitors, partially correcting the MMP-9/TIMP-1 imbalance in a smoke-induced emphysema model (PMID: 35936787) - Drives tissue remodeling and chemoattracts macrophages, mast cells, and capillary cells to injury sites (PMID: 18644225) - Modulates expression of ~4,000+ human genes via the Broad Institute Connectivity Map, including DNA-repair and antioxidant genes (PMID: 25302294) - Increases stemness and proliferative potential of epidermal basal cells and keratinocytes (PMID: 23019153) - Acts as an antioxidant and anti-inflammatory copper regulator in the context of aging (PMID: 22666519) - Broad skin-regeneration effects on collagen, proteoglycans, MMPs, and immune/endothelial cell recruitment (PMID: 26236730) ## Frequently asked ### What's the difference between Rapamycin and GHK-Cu? Rapamycin is a longevity that rapamycin's mechanism of action centers on its inhibition of the mechanistic target of rapamycin (mtor), a central serine-threonine kinase that integrates nutrient, growth factor,…. GHK-Cu is a skin, hair & aesthetics that ghk-cu works mostly as a copper shuttle and a signaling peptide. it binds cu(ii) with high affinity (log k around 16.4, close to albumin's 16.2) and can supply or regulate copper…. The two differ in mechanism, half-life (not reported vs ~30-60 min (plasma; approximate legacy figure, no robust modern human PK study)), and typical dose range. ### Which has the longer half-life, Rapamycin or GHK-Cu? Rapamycin has a half-life of not reported. GHK-Cu has a half-life of ~30-60 min (plasma; approximate legacy figure, no robust modern human PK study). Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Can you stack Rapamycin and GHK-Cu? Stacking depends on mechanism overlap, safety profile, and goals. Rapamycin and GHK-Cu should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Listings from the vendors we track. Prices change often, so check the vendor before you buy. Rapamycin prices: https://www.bodyhackguide.co/compound/rapamycin?tab=prices GHK-Cu prices: https://www.bodyhackguide.co/compound/ghk-cu?tab=prices Compare all compounds: https://www.bodyhackguide.co/compare ### Before you buy Rapamycin or GHK-Cu Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor. View Vendor Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ## Related comparisons GHK CU vs AHK CU: https://www.bodyhackguide.co/compare/ghk-cu-vs-ahk-cu Metformin vs Rapamycin: https://www.bodyhackguide.co/compare/metformin-vs-rapamycin **Research use only.** BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. See editorial standards (https://www.bodyhackguide.co/editorial-standards) and affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). 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