--- title: "GHK-Cu Dosage Guide [2026] | BodyHackGuide" url: https://www.bodyhackguide.co/guides/dosage/ghk-cu description: "Complete GHK-Cu dosage guide with protocols, calculator, safety info, and where to buy. Updated for 2026." 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) Skin, Hair & Aesthetics 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. # GHK-Cu Dosage Guide: Protocols, Calculator & Safety Everything you need to know about GHK-Cu dosing: protocols, safety, and where to buy. Dose Range 200-500 mcg SC daily (community/RUO; no clinically established injectable dose) Frequency Once daily subcutaneous; some run 5 days on / 2 days off. Topical: 1-2x daily to cleansed skin. Cycle Length Injectable (community practice): 4-8 week cycles followed by a 4-6 week off-period as a precaution against theoretical copper accumulation. Topical: continuous over 8-12+ weeks, no cycling needed. Half-Life ~30-60 min (plasma; approximate legacy figure, no robust modern human PK study) ## Administration Routes Subcutaneous Topical ### Quick Reconstitution Calculator Calculate syringe units instantly Syringe Draw 10.0 units 2500 mcg/ml · 0.100 ml draw Full Tool (https://www.bodyhackguide.co/tools/reconstitution) For laboratory research use only. This tool performs reconstitution math (concentration and syringe-unit conversion) and is not dosing guidance for humans or animals. ## Dosing Protocols Beginner 200 mcg SC once daily for a 4-week cycle (community/RUO). Topical starting point: a 1-2% GHK-Cu serum once daily. Standard 300-400 mcg SC once daily for a 4-6 week cycle, then a 4-6 week off-period (community/RUO). Topical: 2% serum 1-2x daily. Advanced 500 mcg SC once daily for a 6-8 week cycle at the upper end of the commonly reported community range, then a 4-6 week off-period (community/RUO). Not clinically validated at any dose. ## Weight-Based Dosing Not established. No clinical injectable dosing exists, so there is no validated weight-based scheme. Community protocols use fixed microgram amounts (200-500 mcg SC daily) independent of body weight. ## Commonly Stacked With Common community stacks (not clinically validated): BPC-157 and TB-500 for tissue-repair synergy, KPV for anti-inflammatory and gut-skin support, and epithalon for broader anti-aging protocols. Topically it pairs well with microneedling to boost delivery, and for hair people combine it with minoxidil, finasteride, or RU-58841. Keep GHK-Cu away from strong exfoliating acids, retinoids, and high-dose L-ascorbic acid in the same session, since those can dissociate the copper complex. Injecting copper alongside other peptides does not remove the copper-accumulation concern, so off-cycles stay part of the plan. ## Side Effects & Safety 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 systemic dosing, which is why community protocols cycle off. Anyone with a copper-metabolism disorder should avoid it entirely. Two practical cautions from the research community: vials are frequently underdosed (independent testing has reported 30-95% under label), so test for dose accuracy and heavy metals on a copper compound; and because GHK-Cu raises zinc demand, watch for low-zinc signs (acne, cracked mouth corners, sore tongue, hair shedding), which usually resolve with a zinc / copper / ceruloplasmin panel and added zinc. Contraindications Contraindicated in Wilson's disease and other copper-metabolism disorders. Injectable use has no clinical validation and carries a theoretical copper-accumulation risk because subcutaneous delivery bypasses the gut's copper regulation. Avoid during pregnancy and breastfeeding: there is no safety data for systemic GHK-Cu, and copper handling shifts in pregnancy. Check interactions with the Interaction Checker → (https://www.bodyhackguide.co/tools/interaction-checker) ## Additional Notes The systemic dosing here is a single conservative microgram-scale scheme (200-500 mcg SC daily) chosen because it tracks GHK's natural plasma concentration scale and limits injected copper load; subcutaneous injection bypasses the gut's copper regulation, which is why off-cycles are common. A separate, higher-dose biohacker school runs 1-2 mg/day SC; that is noted for honesty but is not the scheme used here, and neither is backed by any human trial. For context, Pickart's animal-scaled systemic estimates land near 100-200 mg in humans, far above any biohacker dose, so the honest read is that no validated human injectable dose exists. On plasma levels: circulating GHK is roughly 200 ng/mL (about 10^-7 M) around age 20 and declines to about 80 ng/mL by age 60 (ng/mL = micrograms/L, not pg/mL). These are historical activity-based estimates from Pickart's discovery-era work, not modern LC-MS assays. None of this is medical or prescriptive dosing advice. Two field notes from the research community are worth building in. First, GHK-Cu tends to do more for people past about 40. Your body makes GHK on its own, levels run high when you are young and start sliding through the mid-30s, so younger users often report side effects without much upside because their own levels are still high. Second, GHK-Cu delivers copper, and copper and zinc push against each other. Laying down collagen raises zinc demand, so if your zinc is already low you can see acne, cracked corners of the mouth, a sore tongue, or extra shedding. Running a zinc / copper / ceruloplasmin panel first, and adding zinc (many use zinc bisglycinate) if you are on the low end, is the usual fix. None of this is medical advice. Credit where it is due: the copper/zinc balance and age framing here draw on protocol notes shared by u/Doctordup2 and others in the r/Peptides research community. Where to Buy GHK-Cu Compare 7 listings across 5 vendors, from $34.99 https://www.bodyhackguide.co/compound/ghk-cu ## Frequently Asked Questions What is the recommended GHK-Cu dosage? The typical dose range for GHK-Cu is 200-500 mcg SC daily (community/RUO; no clinically established injectable dose). It is usually administered Once daily subcutaneous; some run 5 days on / 2 days off. Topical: 1-2x daily to cleansed skin.. Always start with the lowest effective dose. How often should I take GHK-Cu? Does GHK-Cu need to be cycled? Yes, typical cycle length is Injectable (community practice): 4-8 week cycles followed by a 4-6 week off-period as a precaution against theoretical copper accumulation. Topical: continuous over 8-12+ weeks, no cycling needed.. What are GHK-Cu side effects? Where can I buy GHK-Cu? Compare 7 listings from 5 vendors on our price comparison page, starting from $34.99. GHK-Cu Full Profile Research data, mechanisms, and pricing https://www.bodyhackguide.co/compound/ghk-cu Interaction Checker Check drug & compound interactions https://www.bodyhackguide.co/tools/interaction-checker ## Related Dosage Guides All Guides (https://www.bodyhackguide.co/guides) ### PT-141 (Bremelanotide) Skin, Hair & Aesthetics · Dosage Guide https://www.bodyhackguide.co/guides/dosage/pt-141 Free 2026 Peptide Cheat Sheet (PDF) 38 compounds and blends: vial sizes, BAC water volumes, dosing ranges and bloodwork markers. 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Full details in our affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). **Research Disclaimer:** All compounds listed are for laboratory and research purposes only. Not for human consumption. This site does not sell or ship any products. Always consult a qualified healthcare professional and comply with local regulations. © 2026 BodyHackGuide. All rights reserved. · Terms (https://www.bodyhackguide.co/terms) · Privacy (https://www.bodyhackguide.co/privacy) ## Structured data ```json [ { "@context": "https://schema.org", "@type": "Article", "headline": "GHK-Cu Dosage Guide [2026]", "description": "Complete GHK-Cu dosage guide with protocols, calculator, safety info, and where to buy. 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It is usually administered Once daily subcutaneous; some run 5 days on / 2 days off. Topical: 1-2x daily to cleansed skin.. Always start with the lowest effective dose." } }, { "@type": "Question", "name": "How often should I take GHK-Cu?", "acceptedAnswer": { "@type": "Answer", "text": "Once daily subcutaneous; some run 5 days on / 2 days off. Topical: 1-2x daily to cleansed skin." } }, { "@type": "Question", "name": "Does GHK-Cu need to be cycled?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, typical cycle length is Injectable (community practice): 4-8 week cycles followed by a 4-6 week off-period as a precaution against theoretical copper accumulation. Topical: continuous over 8-12+ weeks, no cycling needed.." } }, { "@type": "Question", "name": "What are GHK-Cu side effects?", "acceptedAnswer": { "@type": "Answer", "text": "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 systemic dosing, which is why community protocols cycle off. Anyone with a copper-metabolism disorder should avoid it entirely. Two practical cautions from the research community: vials are frequently underdosed (independent testing has reported 30-95% under label), so test for dose accuracy and heavy metals on a copper compound; and because GHK-Cu raises zinc demand, watch for low-zinc signs (acne, cracked mouth corners, sore tongue, hair shedding), which usually resolve with a zinc / copper / ceruloplasmin panel and added zinc." } }, { "@type": "Question", "name": "Where can I buy GHK-Cu?", "acceptedAnswer": { "@type": "Answer", "text": "Compare 7 listings from 5 vendors on our price comparison page, starting from $34.99." } } ] }, { "@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": "GHK-Cu Dosage", "item": "https://www.bodyhackguide.co/guides/dosage/ghk-cu" } ] } ] ```