Yamamoto et al., 2016, Biological and Pharmaceutical Bulletin
Tripeptides reach the blood intact
After a single dose of collagen tripeptide, Gly-Pro-Hyp and Pro-Hyp were measured intact in plasma. Peak Gly-Pro-Hyp was far higher than after a conventional collagen peptide.
doi.org/10.1248/bpb.b15-00624
Tak et al., 2021, Frontiers in Medicine
1 g a day, 12 weeks, skin hydration
A randomised, double-blind, placebo-controlled trial in middle-aged women found better skin hydration with collagen tripeptide. It was well tolerated.
doi.org/10.3389/fmed.2020.608903
Kim et al., 2018, Nutrients
Hydration, elasticity and wrinkles
A randomised, double-blind, placebo-controlled study of low molecular weight collagen peptide at 1 g a day reported improvements in all three skin measures.
doi.org/10.3390/nu10070826
Park et al., 2025, Frontiers in Nutrition
Knee comfort over 180 days
A randomised, placebo-controlled trial of low molecular weight collagen peptides at 3 g a day in knee osteoarthritis assessed efficacy and safety; no serious adverse events were reported.
doi.org/10.3389/fnut.2025.1644899
Ichikawa et al., 2010, Int. J. Food Sciences and Nutrition
Hyp-containing peptides in human blood
Hydroxyproline-containing di- and tripeptides were found at high concentration in blood after oral intake of collagen hydrolysate.
doi.org/10.3109/09637480903257711
Bischof et al., 2024, Sports Medicine
Collagen with training
A systematic review and meta-analysis of collagen peptide supplementation combined with long-term training, covering strength, tendon remodelling and recovery.
doi.org/10.1007/s40279-024-02079-0