Collagen peptides

About Collagen peptides

Collagen from bovine hide, porcine skin, fish skin or chicken cartilage, hydrolysed into short peptides of around 2–5 kDa so it dissolves in cold liquid. It is not a complete protein — it contains no tryptophan.

Collagen is the most commercially successful supplement of the last decade and its evidence base is the clearest illustration in this file of why funding and endpoints matter. The skin trials are numerous, mostly small, almost uniformly funded by collagen manufacturers, and built on endpoints — self-rated skin appearance, cutometer elasticity readings, instrument-measured hydration — that are soft and easy to move. Meta-analyses of that literature report benefits while noting the funding pattern and high risk of bias. The joint literature is smaller and no stronger. The underlying premise is also odd: hydrolysed collagen is digested into amino acids and small peptides like any protein, and the specific peptides said to signal to fibroblasts have been detected in blood but not shown to drive the clinical outcomes.

Sold as

Powder, Capsule, Liquid shot, Gummy, Coffee creamer

Standardised to

Type I, II or III collagen and peptide molecular weight; branded hydrolysates specify their own peptide profile — a product without this marker may not resemble what was studied.

Also known as

Hydrolysed collagen, Collagen hydrolysate, Marine collagen, Bovine collagen

Regulation: Sold as a dietary supplement with no pre-market efficacy review. EFSA has rejected health claim applications for collagen hydrolysate and joint or skin health. Bovine sourcing is subject to BSE-related controls on source material in the EU and elsewhere.

What the research used

The amounts, forms and durations published trials of Collagen peptides actually administered.

When it was taken

Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.

In the food catalogue

The whole-food form, where one exists. The evidence for a concentrated extract rarely transfers to the food, or the other way round — these are cross-links, not equivalents.