: What is the difference between protein supplements and branch chain amino acid supplements? What is the difference between protein supplements and branch chain amino acid supplements? Isn't protein composed of amino acids?

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Branch-chain amino acids (BCAA) are a set of amino acids with a particular chemical structure involving an aliphatic side-chain with a multiple carbon-bond. There are three relevant BCAA: leucine, isoleucine, and valine; these are three of the nine essential amino acids for humans.

BCAA by themselves could be considered a protein supplement, but they are not complete for dietary purposes as a BCAA-only mix does not contain all nine essential amino acids (or more, for efficiency). Any commercial protein mix could have some or all BCAA, but that's going to vary.

BCAA supplementation has been demonstrated to decrease muscle damage and increase muscle-protein synthesis. A couple relevant studies:

Effects of BCAA Supplementation on Skeletal Muscle during Exercise

BCAA supplementation before and after
exercise has beneficial effects for
decreasing exercise-induced muscle
damage and promoting muscle-protein
synthesis; this suggests the
possibility that BCAAs are a useful
supplement in relation to exercise and
sports.

BCAA intake affects protein metabolism in muscle after but not during exercise in humans

results suggest that BCAA have a
protein-sparing effect during the
recovery after exercise, either that
protein synthesis has been stimulated
and/or protein degradation has
decreased

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A lot of protein supplements out there already have BCAA in them. BCAA are the type of amino acids that your body cannot naturally produce, so taking them in addition to protein might be a good idea. BCAA's are known to be anti-catabolics which is beneficial for recovery when working out.

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Even though the answer has already been accepted, thought I'd throw in my two cents. I've been on protein shakes for a year or so and going to the gym and other activities. After going to the gym I'd get extremely exhausted and it would take me a week to recover each time. So I went to the nutrition store and they suggested I take BCAA and right away I noticed that I would recuperate a lot faster after going to the gym. So for me, this really worked.

So what's the difference, when you got the answer already checked. Does it work? Heck yeah.