Written by the BioBodyBoost Nutrition Team · Reviewed by a Registered Nutritionist (RNutr) · May 2026
Collagen supplements are now the UK’s best-selling beauty supplement category, generating over £200 million in annual retail sales. But the market is saturated with products ranging from rigorously formulated hydrolysed peptide drinks to largely ineffective tablet formats with barely relevant doses.
Why marine collagen specifically?
Marine collagen has three advantages over land-based sources. First, it is primarily Type I collagen — the most abundant type in human skin, hair, nails and tendons. Second, marine collagen peptides are smaller in molecular weight, associated with faster absorption. Research in Nutrients confirmed marine collagen peptides demonstrated superior bioavailability compared to bovine sources. Third, marine collagen is suitable for halal consumers and pescatarians.
What does “hydrolysed” mean?
Native collagen molecules are too large to be absorbed intact. Hydrolysis breaks them into smaller peptide fragments (2,000–5,000 Daltons) that can pass through the intestinal wall into the bloodstream. All effective collagen supplements are hydrolysed.
The evidence for skin
A double-blind, placebo-controlled trial found collagen peptides significantly improved skin elasticity, hydration and wrinkle depth after 8 weeks. The mechanism: collagen peptides act as signalling molecules stimulating fibroblasts to produce more collagen. The effective dose in skin studies is consistently 5–10g daily.
The evidence for hair and nails
Collagen provides proline, a direct precursor to keratin. Research found collagen peptides significantly improved nail brittleness and growth rate over 24 weeks. Biotin works synergistically with collagen for hair and nail support.
The evidence for joints
What to look for
| Factor | What to look for |
|---|---|
| Dose | 5–10g hydrolysed collagen per serving |
| Co-factors | Vitamin C, biotin, hyaluronic acid |
| Halal status | Certified marine (not bovine/porcine) |
| Format | Powder or liquid for therapeutic doses |
Explore the full Hair, Skin & Beauty UK and Women’s Wellness UK collections.
Marine collagen is derived from fish and is not suitable for those with fish allergies. Not vegan. Consult your GP before use if pregnant or breastfeeding.
