GHK-Cu
Also known as: Copper Peptide, GHK-Copper, Copper Tripeptide-1
Lower numbers = closer to natural. Higher numbers = more enhanced.
Why this rating?
GHK-Cu is a naturally occurring copper tripeptide found in human plasma at roughly 200 ng/mL at age 20, declining to roughly 80 ng/mL by age 60 (Pickart et al. 2015, PMC4508379). It stimulates collagen/elastin synthesis and wound healing genes. Used primarily for cosmetic purposes (skin, hair) and tissue repair. Does not affect hormones, muscle building, or athletic performance. Unregulated as a cosmetic ingredient in the USA. Rated 1 (basically natty) because it only restores skin/hair/tissue toward baseline youthful function and has no effect on the muscular/physique/performance ceiling.
Overview
A natural copper complex that rejuvenates skin and hair follicles. Found naturally in human plasma, GHK-Cu levels decline with age, and supplementation may restore youthful tissue function.
Important Warnings
- •Never combine vitamin C with GHK-Cu in the same syringe, vial, or topical layer. Free copper + ascorbate is a degrading redox reaction. Systemic separation (oral vitamin C vs subq injection) is precautionary, not proven.
- •Avoid stacking with separate copper supplements: risk of copper accumulation with prolonged high-dose use (cycling mitigates this).
- •"Copper uglies" (skin irritation) can occur if overused, dilute and stay within recommended doses.
Purpose & Use Cases
Skin Rejuvenation
Improves skin elasticity, thickness, and reduces wrinkles.
Hair Growth
Stimulates hair follicles and may reverse hair thinning.
Wound Healing
Accelerates healing of wounds and tissue repair.
Benefits
- Improved skin elasticity and thickness
- Reduced wrinkles and fine lines
- Stimulated hair growth
- Enhanced wound healing
- Increased collagen production
- Anti-inflammatory effects
Good to Know
A copper tripeptide your body already makes
GHK-Cu occurs naturally in human plasma at roughly 200 ng/mL at age 20, falling to about 80 ng/mL by age 60. Supplementing it is closer to restoring a youthful signal than adding a foreign drug, which is why it sits low on the natty scale and has such a benign profile.
The vitamin C rule is real for topical, precautionary for injections
Copper + vitamin C is a genuine degrading redox reaction, so never mix them in the same syringe, vial, or topical layer. But the intact GHK-Cu complex is redox-silenced, so the popular "separate your oral vitamin C from your shot by hours" rule is a sensible precaution, not a proven requirement.
Topical vs injectable, and "copper uglies"
It works as a subcutaneous injection (systemic skin/hair/healing) and as a 0.5-3% topical cream/serum (localized). Overdoing it can cause skin irritation nicknamed "copper uglies", dilute and stay in range. Not hormonal, so no PCT.
Dosage Guidelines
| Route | Typical Dose | Frequency | Cycle |
|---|---|---|---|
| Subcutaneous injection | 1 – 2 mg/day | Once-daily subcutaneous injection (community/practitioner protocols); topical 0.5-3% cream/serum applied 1-2x/day for localized skin or hair use | 4 – 8 wk |
| Topical cream/serum | 0.5-3% cream/serum | 1-2x/day applied to face, scalp, or targeted skin area | 8 – 12 wk |
Dosing depends on how it's administered. Pick your route in the calculator to score the one you use.
Injectable dosing (0.5-2mg/day) reflects community/practitioner protocols, not controlled human trials, the human RCTs behind GHK-Cu's skin evidence used topical formulations only. No formal loading phase is documented; some protocols titrate from 1mg/day up to 2mg/day over the first ~2 weeks. Hair-focused injectable protocols sometimes extend to 8-12 weeks on before a break.
0.5-3% GHK-Cu cream/serum, 1-2x/day (concentration-based, not scorable as a mass dose). This is the route with actual human RCT support - the facial-cream and eye-cream trials cited in the file's references (PMC6073405, PMC4508379) applied creams twice daily for ~12 weeks and showed measurable improvements in wrinkles/collagen, but the published papers largely do not disclose the exact percentage used commercially, so 0.5-3% reflects what's sold as "copper peptide" serums/creams today (e.g., The Ordinary's Multi-Peptide + Copper Peptides 1% serum) rather than the trial formulations themselves.
No rigorous human PK data exists; the peptide is rapidly degraded by peptidases. Vendor/community estimates for plasma half-life vary widely (a few minutes up to ~4 hours), and the gene-expression changes it triggers are believed to outlast measurable peptide levels.
Side Effects
Local Irritation
uncommonIrritation at injection site, sometimes called "copper uglies" if overused.
Dilute injections; don't exceed recommended doses.
Stinging
uncommonMild stinging with topical application.
Patch test before widespread use.
Headache or mild nausea
rareOccasionally reported with subcutaneous injection; generally mild and transient.
Reduce dose or discontinue if symptoms persist; ensure adequate hydration.
General Mitigation Strategies
Dilute injections if irritation occurs. Patch test topical forms before widespread use. Very safe when used appropriately.
Support Supplements
Ancillary supplements commonly run alongside GHK-Cu to manage side effects, support the target tissue, or fill nutrient demands it creates.
Vitamin C (ascorbate)
KeyObligate cofactor for prolyl/lysyl hydroxylase: the enzymes that stabilize and cross-link the collagen GHK-Cu stimulates. Without adequate vitamin C, collagen synthesis is rate-limited regardless of the peptide signal.
- Dose
- ~80-500mg/day
- Timing
- Keep AWAY from the GHK-Cu itself: for topical, split AM/PM (vitamin C morning, GHK-Cu evening); for injections, never draw vitamin C into the same syringe or vial.
- When
- Important nuance often stated as fact: free copper + ascorbate undergo a Fenton-type redox reaction that degrades both. This is real and established for TOPICAL co-application and in-vial mixing (acidic L-ascorbic acid). But the intact GHK-Cu complex is redox-silenced (binding constant log K ~16.4) and resistant to ascorbate, so the popular "separate your oral vitamin C from your subq shot by hours" rule is a reasonable precaution, not a proven requirement. Bottom line: never mix them in one syringe/topical layer; strict systemic timing is optional.
Hydrolyzed collagen / collagen peptides
Supplies the glycine/proline/hydroxyproline building blocks for the collagen and extracellular matrix GHK-Cu upregulates. Works with vitamin C for skin/hair goals.
- Dose
- 2.5-10 g/day
- Timing
- Daily: consistency matters more than clock time
- When
- Most relevant when using GHK-Cu for skin/hair/anti-aging rather than pure wound healing.
Zinc / copper balance
Keeps trace-mineral status in range. Prolonged copper-peptide use plus any copper supplement can tip the zinc:copper ratio; conversely high-dose zinc (common in lifters) can drive copper deficiency.
- Dose
- Keep dietary zinc:copper roughly 8:1 to 15:1
- Timing
- Separate zinc/copper supplements from the injection
- When
- GHK-Cu alone delivers little elemental copper, so imbalance mainly appears when stacking separate copper or high-dose (>25mg/day) zinc. Watch for either extreme.
Post Cycle Therapy (PCT)
Does not affect hormones. No PCT required.
How It Works
GHK-Cu is a tripeptide with high affinity for copper. It stimulates collagen and elastin synthesis, promotes blood vessel growth, activates wound healing genes, and has anti-inflammatory properties. Also shown to stimulate hair follicle growth.
Fundamentals
Reference on the practices relevant to GHK-Cu: how they are done and where they go wrong. Not a recommendation to use it.
Common Stacks
- GLOW stack (GHK-Cu + BPC-157 + TB-500) - Skin, hair & healing
- KLOW stack (GLOW + KPV) - Adds anti-inflammatory / gut support
- GHK-Cu + Epithalon - Anti-aging stack
Legal Status
Unregulated cosmetic ingredient (topical, USA): sold under the INCI name Copper Tripeptide-1; the injectable form is marketed as an unapproved research chemical and is not FDA-approved for human injection.
Legal status varies by country and changes over time. This is a general summary, not legal advice.
WADA Status
GHK-Cu is not explicitly named on the WADA Prohibited List and is widely treated by harm-reduction/compliance resources as permitted. It is a naturally occurring plasma peptide used mainly as a topical cosmetic ingredient, not a growth factor or hormone. Still, as an unapproved research chemical when used by injection, it could theoretically be argued under S0 (non-approved substances) for tested athletes, so status is not 100% certain. Verify before competition.
References
- Pickart & Margolina: Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data (Int J Mol Sci 2018; PMC6073405)
- Pickart, Vasquez-Soltero & Margolina: GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration (Biomed Res Int 2015; PMC4508379)