BCAA, EAA or whey protein: which do you need?

ProteinLast updated: Reviewed before publication

The difference between BCAAs, essential amino acids and whey protein, and when each one makes sense.

The basics

Protein is made of amino acids. Nine are essential (EAAs), which means your body cannot make them and they must come from food. Three of the nine, leucine, isoleucine and valine, are the branched-chain amino acids (BCAAs).

How they compare

SupplementContainsBest use
Whey proteinAll essential and non-essential amino acidsMost people: complete protein at a good price
EAAAll nine essential amino acidsTraining fasted or long sessions; low-calorie option
BCAAThree essential amino acidsFlavoured drink during training; least complete

What research says

Muscle needs all essential amino acids to build new protein. The ISSN notes that complete protein sources such as whey are effective, and that BCAAs alone do not supply everything muscle needs. If your daily protein is already high, extra BCAAs add little.

When amino acids make sense

  • You train early without eating and want something light.
  • You do long sessions and like a flavoured drink while training.
  • You want amino acids with almost no calories while cutting.

For most people, reaching the daily protein target with food and whey protein comes first. Find your target with the protein calculator.

Frequently asked questions

Is EAA better than BCAA?

EAAs are more complete because they contain all nine essential amino acids, while BCAAs contain only three.

Can I take BCAA and whey together?

You can, but if you already drink whey and eat enough protein, BCAAs add little.

Do amino acids break a fast?

They contain very few calories, but they are still nutrients. If you fast for religious or medical reasons, follow those rules.

Scientific references

  1. Journal of the International Society of Sports Nutrition. International Society of Sports Nutrition Position Stand: protein and exercise (Jäger et al.) (2017-06-20) — PMID: 28642676 · DOI: 10.1186/s12970-017-0177-8
  2. NIH Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health Professionals
  3. Journal of the International Society of Sports Nutrition. ISSN exercise & sports nutrition review update: research & recommendations (Kerksick et al.) (2018-08-01) — PMID: 30068354 · DOI: 10.1186/s12970-018-0242-y

Related articles

Whey protein guide: concentrate, isolate and hydrolysateWhat whey protein is, the difference between concentrate, isolate and hydrolysate, and how to choose the right one.

Educational content based on the references listed. This article gives no dosing or usage instructions and does not replace professional medical advice.