Collagen vs Tretinoin for skin & hair
Short answer: For skin & hair, more users report improvement with Collagen — 96% of 71 reports, versus 91% of 35 for Tretinoin.
Collagen has 9 meta-analyses and 22 randomized trials on PubMed; Tretinoin has 76 and 265.
Based on 292 reports about Collagen and 50 about Tretinoin. Not medical advice.
| Collagen Supplement | Tretinoin Medication | |
|---|---|---|
| Users say it helped | 56%helped120 reports · high confidence | 91%helped23 reports · medium confidence |
| Verdict | Mixed | Mostly positive |
| Research | AResearch: Strong | AResearch: Strong |
| Meta-analyses / RCTs | 9 / 22 | 76 / 265 |
| Mainly used for | ||
| Skin & hair % reporting improvement | 96% (71) | 91% (35) |
| Recovery % reporting improvement | 94% (47) | — |
| Pain & inflammation % reporting improvement | 92% (24) | — |
| Sleep % reporting improvement | 100% (8) | — |
| Performance % reporting improvement | 100% (5) | — |
| Common side effects | fatigue, insomnia, drowsiness, histamine episode | sunburn, irritation, skin peeling |
| Typical dose reported | 7 g / daily | Not listed |
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 ↗“Within hours of consumption my consistent upper back pain is literally gone, but along with it comes dizziness and a feeling of aloofness.”
These guidelines provide evidence-based recommendations for the management of acne vulgaris.
J Am Acad Dermatol, 2024 ↗“I have gotten good result on the acne front with tretinoin and azelaic acid.”
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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