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While it's possible to get a sufficient amount of the BCAAs from your diet, for those who work out intensively, and/or for those on specific diets aimed to lose weight, it might be difficult to get the right amino acid balance, which is why some will chose a BCAA supplement in the hope that it will round out their nutrients

Boylan, F, Antinociceptive Activity of Zanthoxylum piperitum DC

Comparative phosphoproteomics reveals evolutionary and functional conservation of phosphorylation across eukaryotes

(2015) 103:e4450

Replenishment of chloride can come from utilizing salt (often found as sodium-chloride, or table salt), cheese, canned fish, and some processed meats

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