I remain skeptical that's a thing and no studies to date have adjusted for all the possible confounders and variables to show it as far as I know.
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For the non scientists, as I have been saying a while now. Worth reading as it's not a third party write up, but written by primary researchers in the field:
"Under very similar lab conditions to the latter whey study, we gave a similar group of male subjects 5.6g of BCAAs following a session of lifting weights – the equivalent to 20g of whey. The resulting protein synthesis response was only about 22% – or about half what would be achieved with the equivalent dose of whey."
Full article:
https://theconversation.com/bcaa-sup...-muscles-84411