Evidence / Sources / E91
Zdzieblik D et al. Specific Bioactive Collagen Peptides and Knee Joint Discomfort in Young Physically Active Adults (part-funded by GELITA; per-protocol analysis; authors state results do not transfer to other collagen products). Nutrients 2021
Everything on this site that leans on E91 — 0 claims
Nothing cites this source yet — it is part of the vetted evidence base for content still being written.
Population
Active adults, exercise-related knee pain — a different population from MACI itself. Wherever this source appears, that flag appears with it.
Selection policy
Sources enter the registry through docs/research — the evidence table records design, population, and size for every entry, and pages cannot cite anything outside it.