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4Optional

BCAAs

Also sold as Branched-chain amino acids, leucine, EAAs

Largely redundant if total protein intake is adequate.

TrustedSupp Tier System™ · Tier 4Take by choice, or not at all

Evidence strength

28/100Weak
WEAKLIMITEDMODERATESTRONGVERY STRONG

What the evidence supports: muscle protein synthesis — inferior to complete protein in head-to-head trials.

This scores how well-supported the claim above is — not how much benefit you personally would get. A high score on a narrow claim does not extend to everything the product is marketed for.

How long to take it

No established course. Whole protein does the job better.

Who it's actually for

Very few people. Complete protein or EAAs beat BCAAs in nearly every scenario.

Safe upper limit

Unverified
No formal limit; 5–10 g typical
Safe, but competes with other amino acids for transport, which is part of why isolated BCAAs underperform.
No source or citation attached yet.

Interactions to know about

No commonly documented medication clashes in our data. That is not the same as none existing.

Other supplements:

Run your full list through the interaction check.

Practical notes

  • Whey already contains more BCAAs than a typical BCAA serving, plus everything else.
  • If you want an intra-workout amino, EAAs have better support than BCAAs.