Legion Casein+ Review
21 g of certified grass-fed micellar casein per serving. The pre-sleep protein evidence is real but small, and this costs more than Legion's own whey.
A genuine micellar casein with third-party grass-fed certification, which is rarer than the label market suggests. The pre-sleep protein research is real and the effect is small. At $2.60 a serving one-time it costs more than Legion's own whey isolate, so buy it for the slow digestion, not because you expect more muscle per gram.
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
| Protein per serving | 21 g |
| Type | Micellar casein |
| Essential amino acids | 9 g per serving |
| Grass-fed certification | Truly Grass Fedâ„¢ |
| Serving size | 27 g |
| Proprietary blend | None |
| Size | 25 servings |
| One-time purchase | $64.99 — $2.60 per serving |
| With a subscription | $48.74 — $1.95 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.
What micellar casein actually changes
Casein clots in the stomach and empties slowly, which spreads amino acid delivery over hours rather than the sharp peak whey produces. Micellar casein is the form that keeps that property intact, as opposed to caseinates, which are processed harder and digest faster. That difference is the entire argument for the product, and it is a real physical difference rather than a marketing one.
The pre-sleep protein evidence, at its actual size
The studies feeding 30 to 40 g of casein before sleep show higher overnight muscle protein synthesis and, over training blocks, small advantages in muscle gain. The important caveat is that those trials generally added the protein on top of an already adequate intake. Where daily protein is matched, the timing advantage shrinks to something you would struggle to measure. Take it as a way to hit your daily number in a slot where food is inconvenient, not as a separate mechanism.
Note the serving is 21 g, not 30
The trials that produced the overnight effect used 30 to 40 g. One scoop here gives 21 g. If you are copying the protocol rather than just topping up your intake, that means one and a half scoops, and the cost per night moves accordingly. This is the kind of arithmetic that gets left out of the marketing and it changes the price of the thing you actually want.
What certified grass-fed means, and why it is not nothing
There is no legal definition of grass-fed dairy in the United States, so the phrase on a tub is an honour system unless a third party audits it. Legion uses Truly Grass Fedâ„¢ certified micellar casein, which involves an inspected standard rather than a claim. Whether that is worth paying for is a values question, not a performance one: it does not make the protein work better.
Who it is for
- You want a slow protein for the evening or a long gap between meals
- You already hit your daily protein and want to place it better
- The grass-fed certification matters to you
- You are choosing on price — whey is cheaper here and works
- You are not yet hitting your daily protein target
- You want the post-workout spike, which is whey's job
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.