BCAAs

Does it work?

• -Mostly no. For anyone already hitting their daily protein target, BCAAs add nothing measurable to muscle or strength. They're missing the full set of essential amino acids your body needs to actually build muscle.

The catch

• -Building muscle needs all 9 essential amino acids — BCAAs are only 3 of them.
• -Whole protein (whey, eggs, meat) already contains those 3 plus the other 6, so a separate BCAA supplement just duplicates what's in your food.
• -In head-to-head studies, whey roughly doubles the muscle-building response of the same dose of isolated BCAAs.

Better option

• -Just hit 1.6–2.2 g of protein per kg of bodyweight per day. That covers your BCAAs automatically and does far more for the same or less money.

Safety

• -Safe — they're just amino acids.
• -The only real downside is the cost and the false sense that they're doing the work your overall protein intake is actually doing.

Key research

• International Society of Sports Nutrition Position Stand: Effects of essential amino acid supplementation on exercise and performanceJ Int Soc Sports Nutr · 2023 · Position stand
• Branched-chain amino acids and muscle protein synthesis in humans: myth or reality?J Int Soc Sports Nutr · 2017 · Review
• Is Branched-Chain Amino Acids Supplementation an Efficient Nutritional Strategy to Alleviate Skeletal Muscle Damage? A Systematic ReviewNutrients · 2017 · Systematic review
• Does Branched-Chain Amino Acids (BCAAs) Supplementation Attenuate Muscle Damage Markers and Soreness after Resistance Exercise in Trained Males? A Meta-Analysis of Randomized Controlled TrialsNutrients · 2021 · Meta-analysis

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