GHK-Cu vs TB-500
Both are sold as repair peptides, but each one's only real human data sits somewhere narrow and unrelated: a cosmetic cream for one, a dry-eye drop for the other.
GHK-Cu
Copper tripeptide
Real tissue-remodeling biology, mostly in-vitro and topical; a cosmetic signal, not systemic anti-aging proof.
Full GHK-Cu evidence reviewTB-500
Thymosin β4
Mechanistic and early-stage human work (e.g. ophthalmology); no performance or recovery outcome trials.
Full TB-500 evidence reviewSide by side
| GHK-Cu | TB-500 | |
|---|---|---|
| Marketed for | Skin, hair, 'anti-aging' | Recovery, tissue repair |
| Evidence grade | Preclinical / minimal | Preclinical / minimal |
| Family | Repair / structural | Repair / structural |
| Regulatory status | Not FDA-approved | Not FDA-approved |
| How it's obtained | Research-only | Research-only |
| Key human source | J Biomater Sci, 2008 | Expert Opin Biol Ther, 2018 |
marks a row where the two differ. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
Our verdict
Neither supports the systemic tissue-repair use it is marketed for. GHK-Cu's human evidence is limited to small cosmetic studies of topical copper-peptide creams; its regenerative and gene-expression findings are in vitro and animal work, and the injected form has no human efficacy trials or established dosing. Thymosin beta-4 does have randomized human data, but it comes from Phase 2 trials of an ophthalmic solution for severe dry eye, not from the injectable TB-500 sold for muscle and tendon recovery, which has no published human efficacy trials, no established dose, and is prohibited in sport by the World Anti-Doping Agency. They have not been compared directly, and neither is an approved drug.
GHK-Cu fits if
Someone whose actual goal is skin, where the topical route is the lowest-risk lane and the modest cosmetic evidence at least matches the use.
TB-500 fits if
Someone interested in actin-sequestering repair biology or the ophthalmology program specifically, and who does not mistake that eye-drop trial for the vial sold for recovery.
Where to get it
Where to get peptide therapy
Clinician-led telehealth services that prescribe compounded peptides. The specific peptides offered vary by provider — confirm GHK-Cu availability before ordering.
