Creatine vs BCAA: Which One Actually Builds Muscle?

If you are choosing one, choose creatine. Creatine monohydrate has hundreds of trials showing more strength and lean mass when combined with training, and it costs about 25¢ a day. BCAAs (branched-chain amino acids: leucine, isoleucine and valine) add little if you already eat enough protein, because protein foods and whey already contain them, along with the other amino acids muscle needs. They are not mutually exclusive, but for most people BCAAs are the supplement to drop.

Creatine and BCAAs are often sold side by side as “muscle” supplements, but they do completely different things. Here is how each works, what the research shows, and when, if ever, BCAAs make sense.

How this comparison was put together

I read the International Society of Sports Nutrition position stand on creatine, a 2017 review of BCAAs and muscle protein synthesis by Robert Wolfe, and a 2017 trial comparing BCAAs with placebo, listed under Sources. I have not run any trial myself. This is general information, not medical advice.

How creatine works

Creatine is stored in muscle as phosphocreatine, which regenerates ATP, the energy used for short, all-out efforts such as heavy sets and sprints. Taking 3–5 g a day raises muscle stores by about 20%, which lets you do a little more work in each hard set. Over weeks of training, that adds up: the ISSN position stand describes creatine monohydrate as the most effective nutritional supplement available for increasing high-intensity exercise capacity and lean body mass. Timelines are in how long creatine takes to work.

How BCAAs work

Leucine, isoleucine and valine are three of the nine essential amino acids. Leucine in particular switches on muscle protein synthesis, which is why BCAAs are marketed for muscle growth. The problem is that switching synthesis on is not enough: building muscle needs all nine essential amino acids, and BCAAs supply only three. In his 2017 review in the Journal of the International Society of Sports Nutrition, Wolfe concluded that BCAAs alone cannot support a meaningful increase in muscle protein synthesis, because the other amino acids run out.

A 2017 trial by Jackman and colleagues tested this directly after resistance exercise: 5.6 g of BCAAs raised muscle protein synthesis by about 22% compared with placebo, but that was roughly half the response seen in other studies with a dose of whey protein containing a similar amount of BCAAs. In other words, a protein shake or a protein-rich meal does the same job better.

What about soreness, fatigue and fasted training?

• Soreness: some small studies report slightly less muscle soreness after hard exercise with BCAAs. The effect is modest and inconsistent, and adequate total protein does much of the same. For what the evidence favours against soreness, see the best supplements for muscle soreness.
• Fatigue during endurance exercise: the theory that BCAAs reduce central fatigue has not translated into consistent performance gains.
• Fasted training: if you train early without eating, BCAAs give some amino acids without many calories. An essential amino acid (EAA) product or a small protein shake is a more complete option.

Side by side

Can you take creatine and BCAAs together?

Yes, there is no known interaction, and some products combine them. But adding BCAAs to creatine is only worth it if your protein intake is low, and in that case more protein is the better fix. A useful target for people who lift is roughly 1.6 g of protein per kg of body weight a day, spread across meals. If you struggle to reach it, a protein powder does more than BCAAs; see the best protein powder.

Who might still use BCAAs

• People who train fasted and do not want a protein shake beforehand.
• Vegans or people with very low protein intake, as a stopgap, though an EAA product or plant protein is more complete.
• People who simply like a flavoured drink during long sessions, as long as they know it is mostly a taste choice.

The bottom line and a product to start with

Spend your money on creatine monohydrate and enough total protein. My full comparison of certified powders is in the best creatine powders, and side effects are covered in creatine side effects. The most cost-effective verified option:

Optimum Nutrition Micronized Creatine — 5 g per scoop, nothing added, Informed Choice certified, about 23¢ a day.

As an Amazon Associate I earn from qualifying purchases. This never changes a score, a ranking or a verdict — those are decided before any commercial link is considered.

Common questions

Is creatine better than BCAA?

For strength and muscle, yes. Creatine has strong, consistent evidence; BCAAs add little if you already eat enough protein.

Should I take creatine or BCAA first?

If you take both, order does not matter. Creatine works through daily intake rather than timing, and BCAAs, if used, are taken around training.

Can I take creatine and BCAA together?

Yes. There is no known interaction. Just be aware that the BCAAs probably add little if your protein intake is adequate.

Do BCAAs build muscle?

Not on their own in a meaningful way. They switch on muscle protein synthesis, but muscle needs all nine essential amino acids, which full protein sources provide.

Is BCAA a waste of money?

For most people who eat enough protein, largely yes. A protein shake or an extra protein-rich meal does the same job more completely and usually more cheaply. Among the powders I have priced, Revolution Nutrition High Whey is one of the cheapest per gram of protein.

Sources

• Kreider RB et al. ISSN position stand: safety and efficacy of creatine supplementation. J Int Soc Sports Nutr. 2017.
• Wolfe RR. Branched-chain amino acids and muscle protein synthesis in humans: myth or reality? J Int Soc Sports Nutr. 2017.
• Jackman SR et al. Branched-chain amino acid ingestion stimulates muscle myofibrillar protein synthesis following resistance exercise in humans. Front Physiol. 2017.
• Hultman E et al. Muscle creatine loading in men. J Appl Physiol. 1996.