BCAA, EAA or protein powder? What studies show on muscle growth and muscle soreness, what each one contains, which foods are high in BCAAs and when amino acid supplements make sense.
For most people who train, a complete protein, whether from food or a protein powder, covers everything BCAA and EAA supplements offer. BCAAs alone can't build muscle, because your body needs all nine essential amino acids to make new muscle protein. EAA supplements contain all nine and do work, but they have no clear advantage over protein if you already eat enough of it. BCAAs may ease muscle soreness a little compared with nothing, but a protein shake contains the same BCAAs. This guide explains the differences, what the studies show, which foods are rich in BCAAs, and the few situations where an amino acid supplement can make sense.
What are amino acids, EAAs and BCAAs?
Amino acids are the building blocks of protein. Your body uses 20 of them, and nine are essential amino acids (EAAs): your body can't make them, so they have to come from food. You can read more about all nine in our guide to essential amino acids.
Three of the nine EAAs, leucine, isoleucine and valine, have a branched chemical structure. They're called branched-chain amino acids (BCAAs). Unlike most amino acids, they're mainly broken down in muscle rather than in the liver, which is one reason they became popular as a sports supplement. Leucine is the one researchers focus on most; more on that in our guide to leucine.
Every complete protein contains all of these. So protein powder, tofu or lentils give you EAAs and BCAAs as a package, together with all the other amino acids.
| BCAA supplement | EAA supplement | Protein powder | |
|---|---|---|---|
| Contains | 3 amino acids: leucine, isoleucine, valine | All 9 essential amino acids | All 20 amino acids, including all EAAs and BCAAs |
| Can build new muscle protein on its own | No, the other 6 EAAs are missing | Yes | Yes |
| Calories | Very few | Few | About 110–120 kcal per 30 g serving |
| Best for | Rarely needed | When you can't eat protein around training | Most people: an easy way to reach your daily protein |
Do BCAAs build muscle?
Not on their own. To build new muscle protein, your body needs all nine essential amino acids at the same time. If you take only BCAAs, the other six have to come from somewhere, and the only source is the breakdown of your own muscle protein. A review by Robert Wolfe concluded that the claim that BCAAs alone produce an anabolic (muscle-building) response in humans is unwarranted [1].
Studies show a more nuanced picture: in one trial, 5.6 g of BCAAs after strength training increased muscle protein synthesis by 22 % compared with a placebo drink [2]. But that's a comparison with nothing. A narrative review of the long-term studies concluded that isolated BCAAs or leucine don't add strength or muscle when people already eat enough protein [3].
In short: BCAAs send a signal, but without the other building blocks the signal can't turn into much muscle. A complete protein delivers both.
Do BCAAs reduce muscle soreness?
They might. Two meta-analyses found less muscle soreness after hard or unfamiliar exercise with BCAA supplements than with a placebo [4][5]. The 2024 analysis also found slightly lower creatine kinase, a blood marker of muscle damage, and the effects were larger when people took BCAAs for several days before the exercise [5].
Two things to keep in mind: the studies were small, and they compared BCAAs with a placebo, not with the same amount of BCAAs from protein. One study that compared BCAAs with a carbohydrate drink after three days of hard strength training found no difference in recovery markers [6]. A 30 g protein shake contains about 4–5 g of BCAAs anyway, so if you already drink one, a separate BCAA product adds little.
Are EAA supplements better than protein powder?
Not if you eat enough protein. EAA supplements contain all nine essential amino acids, so unlike BCAAs they can support muscle protein synthesis on their own, and they do so at a smaller dose than intact protein because nothing "non-essential" is included [7]. That can be useful in specific situations, such as when someone can't eat much (see below).
For everyone else, protein powder or a protein-rich meal does the same job, keeps you fuller and costs less per gram of essential amino acids. Free amino acids also taste bitter, so EAA products usually need more flavourings and sweeteners.
How much protein do you need?
- Per day: the International Society of Sports Nutrition recommends 1.4–2.0 g of protein per kg of body weight for most people who exercise [8]. A meta-analysis found that gains in muscle mass levelled off at about 1.6 g per kg per day [9].
- Per meal: about 20–40 g of protein, spread over three to five meals a day [8].
- Timing: your total daily protein matters far more than the exact minute you drink your shake. There's no need to rush to have it straight after training [10].
If you reach these amounts, you also get enough EAAs and BCAAs, and isolated amino acid supplements won't add much.
Which foods are high in BCAAs?
Every protein-rich food contains BCAAs. In plant proteins they make up about 17–20 % of the protein, and in whey about 25 %. So the more protein a food has, the more BCAAs it provides. Good vegan sources:
| Food | Portion | Protein (approx.) |
|---|---|---|
| Firm tofu | 150 g | 18–22 g |
| Tempeh | 100 g | 19 g |
| Cooked lentils | 200 g | 18 g |
| Cooked chickpeas | 200 g | 17 g |
| Soy milk | 300 ml | 10 g |
| Peanuts | 30 g | 8 g |
| Pumpkin seeds | 30 g | 9 g |
| WAM Protein | 30 g | 21–23 g (4.5–4.7 g BCAAs) |
Plant proteins tend to contain less leucine than animal proteins [11]. That's why combining several sources, such as soy, legumes and grains, over the day works well, and why plant protein blends often use soy, pea and rice together.
When can BCAA or EAA supplements make sense?
- You can't eat protein around training: for example during a long endurance event, or when food or a shake doesn't sit well. A clear amino acid drink can be easier to get down. EAAs are the better choice here.
- Very low appetite or very low protein intake: EAAs provide the essential building blocks in a small volume. If this applies to you for medical reasons, talk to a doctor or dietitian.
- BCAA pills vs powder: they contain the same amino acids. Powder is usually cheaper per gram, while you'd need several capsules to reach the doses used in studies.
For everyone else, enough total protein from food plus a protein shake when it's convenient is the simpler, cheaper option.
Checklist: do you need BCAAs or EAAs?
- ☐ Do you eat about 1.4–2.0 g of protein per kg of body weight a day? Then you're already covered.
- ☐ Does your protein come from a mix of sources, such as soy, legumes, grains, nuts and seeds?
- ☐ Do you drink a protein shake? Then a separate BCAA product is redundant.
- ☐ Can't eat or drink protein around a long session? An EAA drink can be a practical exception.
- ☐ Spend the money on protein you'll actually eat, not on isolated amino acids.
"BCAAs are one of the best-marketed supplements in the gym, but as a chemist I find it hard to justify paying for three amino acids when a complete protein gives you all twenty. Get your protein right first." – Dr. Anna Falk, PhD chemist, sports nutritionist and founder of WAM
FAQ: BCAA, EAA or protein powder
Do I need BCAAs if I take protein powder?
No. A 30 g serving of protein powder already contains about 4–5 g of BCAAs, plus all the other essential amino acids your muscles need. A separate BCAA product adds little.
BCAA or EAA: which is better?
EAAs. They contain all nine essential amino acids, including the three BCAAs, so they can support muscle protein synthesis on their own, while BCAAs can't. If you eat enough protein, you don't need either.
Do BCAAs help with muscle soreness?
Possibly a little. Meta-analyses found less soreness with BCAAs than with a placebo, mainly when taken for several days before hard exercise. The studies were small, and a protein shake provides similar amounts of BCAAs.
Does protein powder contain BCAAs and EAAs?
Yes. Every complete protein powder contains all nine essential amino acids, including the three BCAAs. WAM Protein provides 8.6–9.3 g of EAAs and 4.5–4.7 g of BCAAs, including 2.5 g of leucine, per 30 g serving, depending on the flavour.
Which foods are high in BCAAs?
All protein-rich foods. Good vegan sources include tofu, tempeh, lentils, chickpeas, soy milk, peanuts and pumpkin seeds. BCAAs make up about a fifth of the protein in most plant foods.
Are BCAA pills or powder better?
They contain the same amino acids. Powder is usually cheaper per gram, and you'd need several capsules to reach the 5 g or more used in most studies.
WAM Protein: all nine essential amino acids
WAM Protein is a vegan blend of soy, pea and rice protein with 21–23 g of protein per 30 g serving, depending on the flavour, providing all nine essential amino acids. Because plant proteins tend to contain less leucine, we add extra leucine, for 2.5 g in total per serving. It's sweetened only with a small amount of stevia, never with sucralose. Protein contributes to the growth and maintenance of muscle mass.
Try every flavour
The WAM Sample Pack has a sachet of every flavour, so you can find your favourite before buying a full bag.
The WAM Sample Pack has a sachet of every flavour, so you can find your favourite before buying a full bag.
Sources
[1] Wolfe RR. Branched-chain amino acids and muscle protein synthesis in humans: myth or reality? J Int Soc Sports Nutr. 2017;14:30. PubMed
[2] Jackman SR, Witard OC, Philp A, et al. Branched-Chain Amino Acid Ingestion Stimulates Muscle Myofibrillar Protein Synthesis following Resistance Exercise in Humans. Front Physiol. 2017;8:390. PubMed
[3] Plotkin DL, Delcastillo K, Van Every DW, et al. Isolated Leucine and Branched-Chain Amino Acid Supplementation for Enhancing Muscular Strength and Hypertrophy: A Narrative Review. Int J Sport Nutr Exerc Metab. 2021;31(3):292-301. PubMed
[4] Fedewa MV, Spencer SO, Williams TD, et al. Effect of branched-Chain Amino Acid Supplementation on Muscle Soreness following Exercise: A Meta-Analysis. Int J Vitam Nutr Res. 2019;89(5-6):348-356. PubMed
[5] Salem A, Ben Maaoui K, Jahrami H, et al. Attenuating Muscle Damage Biomarkers and Muscle Soreness After an Exercise-Induced Muscle Damage with Branched-Chain Amino Acid (BCAA) Supplementation: A Systematic Review and Meta-analysis with Meta-regression. Sports Med Open. 2024;10(1):42. PubMed
[6] Kephart WC, Mumford PW, McCloskey AE, et al. Post-exercise branched chain amino acid supplementation does not affect recovery markers following three consecutive high intensity resistance training bouts compared to carbohydrate supplementation. J Int Soc Sports Nutr. 2016;13:30. PubMed
[7] Gwin JA, Church DD, Wolfe RR, Ferrando AA, Pasiakos SM. Muscle Protein Synthesis and Whole-Body Protein Turnover Responses to Ingesting Essential Amino Acids, Intact Protein, and Protein-Containing Mixed Meals with Considerations for Energy Deficit. Nutrients. 2020;12(8):2457. PubMed
[8] Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20. PubMed
[9] Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. 2018;52(6):376-384. PubMed
[10] Arent SM, Cintineo HP, McFadden BA, Chandler AJ, Arent MA. Nutrient Timing: A Garage Door of Opportunity? Nutrients. 2020;12(7):1948. PubMed
[11] Berrazaga I, Micard V, Gueugneau M, Walrand S. The Role of the Anabolic Properties of Plant- versus Animal-Based Protein Sources in Supporting Muscle Mass Maintenance: A Critical Review. Nutrients. 2019;11(8):1825. PubMed
