Legion EAA Review
Legion's own page says maximising muscle protein synthesis takes 15 to 18 g of EAAs. A serving gives 5 g. What that means for whether you should buy it.
An honest product with a label that tells the truth, and the truth is that it is a convenience item. Legion's own product page states that maximising muscle protein synthesis takes 15 to 18 g of essential amino acids; a serving here is 5 g. The same page states that free-form EAAs are no better than the EAAs in food. Buy it for the situations where a shake or a meal is not practical, and for nothing else.
Disclosure: we earn a commission if you buy through this link, at no extra cost to you. It does not change what this page says, and we were not paid to write it.
What is in it
| Essential amino acids | 5,000 mg |
| Leucine | 1,500 mg |
| Amino acids covered | All nine essential |
| Proprietary blend | None |
| Size | 30 servings |
| One-time purchase | $29.99 — $1.00 per serving |
| With a subscription | $22.49 — $0.75 per serving |
Prices checked at legionathletics.com on 29 August 2026 and will have moved since. The subscription price is a recurring order you can cancel, not a one-off discount — check the current price before you buy.
The number that decides this
Legion's own page puts the clinically effective range at 3 g of EAAs, enough to stimulate muscle protein synthesis, up to 15 to 18 g, which maximises it. A serving of this is 5 g. That is above the floor and well below the ceiling, so it does something and it does not do the most that could be done. A brand printing the ceiling next to its own smaller dose is unusual and worth crediting.
Why EAAs beat BCAAs, and why that is a low bar
BCAA supplements contain three of the nine essential amino acids. Muscle protein synthesis needs all nine present; if one is missing or short, the process is limited by that one. So EAAs are strictly better than BCAAs. That does not make either better than protein, which contains all nine plus everything else.
Free-form amino acids are not magic
Legion's page says it plainly: free-form EAAs are no better, and no worse, than the EAAs in whole food or a protein powder. The only advantage is logistics. An EAA drink is a way to get amino acids in when a shake would sit badly or a meal is not happening, and 20 g of whey would do the same job for less money with more of everything else attached.
Where the 1,500 mg of leucine sits
Leucine is the trigger, and the threshold commonly cited for a maximal response is around 2.5 to 3 g in a serving. At 1.5 g this is below it. Two servings clears it and costs $2.00 one-time, at which point a scoop of whey is cheaper and gives you 22 g of complete protein.
Who it is for
- You train fasted or early and cannot stomach a shake beforehand
- You travel and want something that mixes in water
- You want all nine essentials rather than a BCAA product
- You are looking for a cheaper way to hit your protein target
- You can drink a protein shake instead — that is the better buy
- You believe amino acids in powder outperform amino acids in food
Disclosure: we earn a commission if you buy through this link, at no extra cost to you. It does not change what this page says, and we were not paid to write it.