Collagen vs GHK-Cu for skin & hair
Short answer: For skin & hair, more users report improvement with Collagen — 96% of 71 reports, versus 87% of 202 for GHK-Cu.
Collagen has 9 meta-analyses and 22 randomized trials on PubMed; GHK-Cu has 0 and 1.
Based on 292 reports about Collagen and 496 about GHK-Cu. Not medical advice.
| Collagen Supplement | GHK-Cu Peptide | |
|---|---|---|
| Users say it helped | 56%helped120 reports · high confidence | 62%helped223 reports · high confidence |
| Verdict | Mixed | Mostly positive |
| Research | AResearch: Strong | CResearch: Limited |
| Meta-analyses / RCTs | 9 / 22 | 0 / 1 |
| Mainly used for | ||
| Skin & hair % reporting improvement | 96% (71) | 87% (202) |
| Recovery % reporting improvement | 94% (47) | 96% (27) |
| Pain & inflammation % reporting improvement | 92% (24) | 90% (31) |
| Sleep % reporting improvement | 100% (8) | 80% (5) |
| Performance % reporting improvement | 100% (5) | 100% (6) |
| Common side effects | fatigue, insomnia, drowsiness, histamine episode | injection site, redness, stinging, injection pain |
| Typical dose reported | 7 g / daily | Not listed |
CollagenFull Collagen profile →
Latest review conclusion
The findings of improved hydration and elasticity were also confirmed in the subgroup meta-analysis. Based on results, ingestion of hydrolyzed collagen for 90 days is effective in reducing skin aging, as it reduces wrinkles and improves skin elasticity and hydration.
Int J Dermatol, 2021 ↗What a user said
“Within hours of consumption my consistent upper back pain is literally gone, but along with it comes dizziness and a feeling of aloofness.”
GHK-CuFull GHK-Cu profile →
What a user said
“Love it. 44 F. Totally helped even out my skin tone (Irish red cheeks), reduced wrinkles on my forehead and neck, thickened my hair which had been thinning, and grew my eye lashes.”
Related comparisons
Percentages come from first-hand user reports and are not clinical outcomes. Talk to a doctor before starting, stopping or combining anything. How we rate