Collagen is approximately 50% glycine and proline, making it a poor-quality protein from an amino acid balance perspective compared to animal-derived meat or milk proteins which have more balanced amino acid profiles.
factualpending
Speaker
Unidentified Speaker — Are collagen supplements effective and worth taking? | Pete… [mHTcezYApFc]Evidence Quote
“it's a poor protein from a total perspective it's not as balanced as as an animal derived uh meat protein or milk protein so but it contains a lot of glycine and Proline”
Source
Are collagen supplements effective and worth taking? | Peter Attia and Luc van Loon— Peter Attia MDCreated: 8/12/2026, 6:08:47 PM
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