Marine Collagen Peptides
Type I collagen from fish, broken into short peptides so it survives digestion and reaches the bloodstream.
Hydration is well supported across meta-analyses; elasticity findings are inconsistent between them, and most trials are funded by ingredient makers.
On the label: Hydrolyzed Marine Collagen Peptides. Also known as Marine collagen, Type I collagen peptides, Hydrolyzed collagen, Collagen hydrolysate.
What it does for you
The most consistent result across research is better skin hydration. Improvements in elasticity and fine lines show up in some trials but not all, so we set expectations at hydration first.
Why we use it
5 g is the dose most published skin research is built on, so that is what we use. Under-dosing collagen is the most common shortcut in this category and it makes the whole product decorative.
Mechanism
Eating collagen does not become skin collagen. Digestion breaks it into short peptides, some of which reach the bloodstream intact, and the leading explanation is that these act as a signal to the cells that build collagen rather than as raw material.
Use level
5,000 mg per daily stick in VitalBuild Daily Collagen Powder. Published trials use 2.5 to 10 g/day, most commonly 2.5 to 5 g, over 8 to 12 weeks.
Commonly confused with
Collagen peptides are not the same as gelatin, which is collagen that has been broken down far less and is not absorbed the same way. Marine, bovine and porcine collagen differ in source rather than in mechanism. Marine is mostly Type I, which is the type dominant in skin.
What the studies say
Eye wrinkle volume reduced approximately 20% versus placebo (p<0.05), sustained 4 weeks after stopping. A suction-blister biopsy subgroup showed procollagen I up 65% and elastin up 18%; fibrillin up 6% was not significant.
- Human in vivo
- n = 114 women aged 45-65
- 8 weeks
Double-blind, placebo-controlled, 2.5 g/day
Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis Proksch E, Schunck M, Zague V, Segger D, Degwert J, Oesser S. Skin Pharmacology and Physiology, 2014. DOI 10.1159/000355523
Tests the branded ingredient VERISOL and includes the ingredient developer among the authors. Industry funded.
Skin elasticity improved significantly in both dose groups versus placebo. Hydration and transepidermal water loss showed favourable trends but did not reach significance overall.
- Human in vivo
- n = 69 women aged 35-55
- 8 weeks
Placebo-controlled, 2.5 g or 5.0 g/day
Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology Proksch E, Segger D, Degwert J, Schunck M, Zague V, Oesser S. Skin Pharmacology and Physiology, 2014. DOI 10.1159/000351376
Industry funded; ingredient developer among the authors.
Hydrolyzed collagen significantly improved skin hydration (Z = 4.94, p < 0.001) but showed no significant effect on skin elasticity (p = 0.21). The authors also identified several biases in the included trials. This is the larger and more recent of the two major meta-analyses and it is the more conservative one.
- Meta-analysis
- n = 26 RCTs, 1,721 patients
Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis Pu SY, Huang YL, Pu CM, Kang YN, Hoang KD, Chen KH, Chen C. Nutrients, 2023. DOI 10.3390/nu15092080
Independent. Directly relevant: hydration is the best-supported outcome; elasticity and wrinkle claims are less secure than the category markets them to be.
Concluded that 90 days of hydrolyzed collagen reduces wrinkles and improves elasticity and hydration.
- Meta-analysis
- n = 19 RCTs, 1,125 participants
- 90 days
Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis de Miranda RB, Weimer P, Rossi RC. International Journal of Dermatology, 2021. DOI 10.1111/ijd.15518
A formal methodological rebuttal on study heterogeneity was published in the same journal (Peres G et al, doi:10.1111/ijd.15748). Any brand citing this meta-analysis should know the objection exists, and should note that the larger 2023 meta-analysis did not replicate the elasticity finding.
Who should be cautious
Fish or shellfish allergy. Not studied in pregnancy or breastfeeding.