Hydrolyzed Collagen Peptides (Type I/III)
Hydrolyzed Collagen Peptides (Type I/III) is a tier 1 form of Collagen (Hydrolyzed Collagen Peptides), used in 1,467 on-market products .
Why this tier: Best-represented form across skin, joint and muscle RCTs; multiple double-blind placebo-controlled trials at 2.5-15 g/day (several industry-sponsored, e.g. Gelita/Collagen Research Institute co-authored) show measurable skin and muscle outcomes. Generic "Collagen"/"Total Collagen" label entries (no processing specified) default here as the most common commercial form, flagged for manual review rather than assumed with full certainty.
Source: Proksch E et al. 2014, Skin Pharmacol Physiol 27(1):47-55, PMID 23949208; Demir-Dora D et al. 2024, J Clin Med 13(18):5370, PMID 39336856; Zdzieblik D et al. 2015, Br J Nutr 114(8):1237-45, PMID 26353786