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> so if you get sufficient protein intakes (of the respective amino acids) then your body will just make it.

I don't think everyone produces amino acids as efficiently as everyone else. For some people, perhaps supplementation is beneficial.

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That's an unscientific opinion. Any data?

I'm not inclined to do a bunch of research and I'm not claiming to be the best to interpret the studies, as I don't have a background in biology, but a cursory search shows many results like this https://link.springer.com/article/10.1007/s10545-017-0063-1

I didn't claim I was certain of this however, only that I'm under the impression that amino acid synthesis doesn't work as well for all people, for all amino acids.

Is it any more or less unscientific than the parent comment?

Assuming we're in the unscientific realm, and that scientificity exists on a spectrum, I'd say the parent comment is more scientific, because at least it provides a description of a logical causal chain (collagen is a protein, we digest proteins indiscriminately, therefore ...).

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