Compare BCAA supplements on the grams of branched-chain amino acids per serving, the ratio of leucine to isoleucine and valine, and the cost per gram. BCAAs are three of the amino acids already found in protein foods, and the evidence for taking them on their own is weak if you already eat enough protein, so we explain what you're paying for.
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What are BCAAs?
BCAAs (branched-chain amino acids) are three of the nine essential amino acids: leucine, isoleucine and valine. They're found in all protein foods, including meat, fish, eggs, dairy and protein powder.
Muscle protein synthesis, the process of building new muscle protein, needs all nine essential amino acids, not just these three. A 2017 review in the Journal of the International Society of Sports Nutrition explains that the other essential amino acids have to be available too.
What do BCAAs do?
BCAAs are used, like other amino acids, to make protein in the body. That doesn't mean a BCAA supplement adds anything if your diet already contains enough protein.
There are no authorised health claims for BCAAs in Great Britain. The authorised claims list has claims for protein, such as "Protein contributes to a growth in muscle mass", but only for foods that are at least a source of protein, and a BCAA drink usually doesn't qualify.
Are BCAAs worth it?
For most people who already eat enough protein, the evidence says probably not. The 2017 review concluded that dietary BCAA supplements alone do not promote muscle anabolism, and a 2026 review found that with sufficient protein and energy intake, BCAA supplementation has little or no efficacy for muscle gains during resistance training.
"Where evidence is limited or inconclusive, we should say so openly," says Andy Arshad, who runs SupplementHQ. If you want all nine essential amino acids, compare EAA supplements or protein powder instead.
Do BCAAs help with muscle soreness?
The evidence is mixed and small. A 2021 meta-analysis of nine trials in trained men found lower levels of a blood marker of muscle damage for up to 48 hours, but only a short-lived effect on soreness, which the authors called not conclusive.
The studies used different doses and ratios, and the authors didn't know how much protein the participants ate. We don't claim BCAAs reduce soreness.
What does 2:1:1, 4:1:1 or 8:1:1 mean?
The ratio shows how much leucine there is compared with isoleucine and valine. A 2:1:1 product has twice as much leucine as each of the other two; a 10:1:1 product has ten times as much.
| Ratio | Leucine in 5g of BCAAs | Isoleucine | Valine |
|---|---|---|---|
| 2:1:1 | 2.5g | 1.25g | 1.25g |
| 4:1:1 | about 3.3g | about 0.8g | about 0.8g |
| 8:1:1 | 4g | 0.5g | 0.5g |
We stock 2:1:1, 4:1:1, 8:1:1, 10:1:1 and 20:1:1 products. A higher leucine ratio isn't proven to be better; compare the grams of each amino acid per serving on the label.
BCAA vs EAA: what's the difference?
BCAAs contain three amino acids; EAAs contain all nine essential amino acids, including the three BCAAs. EAA products therefore supply the full set that muscle protein synthesis needs.
Some products in this collection add glutamine, electrolytes or caffeine. If a BCAA product contains caffeine, check the amount: EFSA says single doses of up to 200mg and up to 400mg a day are safe for healthy adults (not pregnant women).
Powder, capsules or liquid?
Choose the format you prefer, then compare the grams of BCAAs per serving and the cost per gram. Capsules usually contain much less per capsule than a scoop of powder, so you may need several to match one serving.
We stock BCAA powders, capsules, liquids and shots. Flavoured powders are the most common.
How to compare value
How to compare value (example figures, not real products): a £20 tub with 40 servings of 5g BCAAs costs 50p a serving and 10p per gram of BCAAs (£20 ÷ 200g). A box of 120 capsules at £12, with 1g of BCAAs per capsule, costs 10p per capsule and 10p per gram, but you'd need five capsules (50p) to match one 5g scoop.
"We think customers should compare the actual amount of active ingredients they're getting, rather than just the format or marketing," says Andy. Our guide to reading a supplement label shows where to find the amounts.
Which is the best BCAA supplement?
If you've decided to buy one, the best for you is the one that lists the grams of each amino acid clearly and has a sensible cost per gram. A higher ratio, more added ingredients or a well-known brand doesn't make a product better.
If you take medication or have a medical condition, speak to your GP or pharmacist first. Browse the rest of our amino acids & recovery range.
We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.
Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.