What Works Skin — Independent · Evidence-First · Ad-FreeIssue 014 · 20 April 2026 · Next: 04 Maywhatworksskin.com

Supplement · Hair & nails · Hydrolysed collagen peptides

P. 07 · BRIEF

Hydrolysed collagen peptides.

Modest, replicated benefit on elasticity. Quality varies by brand.

— § 01

The brief.

Class
Hydrolysed protein peptide
Source
Bovine type I/III · marine type I
Dose
5 – 10 g/d
Timeline
8 – 12 weeks visible
Pregnancy
Generally regarded as safe
Reviewer
Dr. Sundeep · 18-Apr-2026

— § 02

What the literature shows.

Skin elasticity
RCTs, 5–10 g/d, 8–12 wk

Replicated improvement across 19+ trials. Effect size: small-to-moderate.

72%
Hydration
RCTs

Modest TEWL reduction; clinically visible at 12 weeks.

65%
Visible wrinkles
Meta-analysis

Statistically significant, clinically subtle. Not a substitute for a retinoid.

55%
Nail growth
Smaller trials

Real signal but trial quality variable.

60%
'Joint glow' marketing

Wishful.

10%

— § 03

On our shelf.

Vital ProteinsTier A

10 g

Reference Western brand; dye-free.

Power GummiesTier B

5 g

Indian-market entry; dosing on the low end.

Wellbeing NutritionTier A

10 g

Best India-availability + honest dose.

BeautyDose etc.Tier C

Variable

Marketing premium without formula advantage. Skip.

— § 04

Frequently asked.

Does it actually rebuild collagen?

Not directly — and any marketing that says so is wrong. The peptides are broken down to amino acids during digestion. The mechanism is plausibly upstream signalling (specifically dipeptides like Pro-Hyp) that stimulates fibroblast collagen synthesis. The result is real but modest, and takes 12 weeks to read on the face.

Does the type matter (I, II, III, marine, bovine)?

For skin endpoints, less than the marketing suggests. Most positive trials use type I (the dominant skin collagen) from either bovine or marine sources at 5–10 g/d. Type II is for cartilage research. Match price and dose, not type.

Vegan alternatives?

Not yet. 'Vegan collagen' powders contain amino acids that may support endogenous collagen synthesis but have no direct trial evidence for the same endpoints. Better to spend on diet protein + vitamin C and bank the remainder.

Coffee or tea?

Either. Coffee is the most-popular vehicle and does not affect bioavailability.

Cited sources

  1. № 01pmid-18046911on /sources →