Legion Casein+ is the grass-fed, naturally-sweetened option for someone who wants a clean premium label without going fully unflavored. It serves up 26 g of micellar casein — one of the higher per-serving doses in this lineup — from Truly Grass-Fed dairy, sweetened with stevia and free of artificial dyes, sweeteners and fillers, with the kind of fully-disclosed label Legion is known for. The downsides are price-related: it costs more per serving and gives you fewer servings per tub than the value leaders, and unlike the Ascent and NOW picks it doesn't carry an Informed Sport or NSF seal. The brand cites its own lab testing, but that's a manufacturer signal, not an independent certification. If grass-fed sourcing and natural sweetening in a flavored casein are what you're after, it's a strong choice.
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Read the complete Muscle Growth guide →It's micellar casein — the slow-release form — from Truly Grass-Fed dairy, with a clean surrounding formula: stevia, natural flavors, no artificial sweeteners, dyes or fillers. That naturally-sweetened, fully-disclosed micellar formula is exactly what this axis rewards. It sits mid-pack rather than at the very top mainly because the standout single-ingredient and 100%-micellar picks edge it on pure form, but there's nothing to fault in the ingredient list.
26 g of protein per serving — among the higher doses in this lineup — with low carbs and no added sugar, a lean night-friendly macro. The strong protein-by-serving figure is a real plus. It scores solidly rather than top here largely because per-serving calories/BCAA detail is less fully specified on the listing than the leaders, but the headline 26 g is excellent for the overnight slot.
The honest read: Legion is a transparency-focused brand that publishes lab tests and fully discloses its formula, which supports a high score — but it carries no Informed Sport or NSF banned-substance seal. Brand-run lab testing is a manufacturer signal, not an independent banned-substance certification, and we won't frame it as one. If you specifically need a certified tub, the Informed Sport picks (Ascent, NOW) or the NSF pick (Naked) are the verified choices.
This is the weak axis: at about $45 a tub and roughly $1.50 per serving, it's a premium pour with fewer servings than the value leaders. You're paying for grass-fed sourcing, natural sweetening and full label disclosure — real costs — but on pure price per gram of protein it can't match Dymatize or the unflavored bulk bags, which is why it lands near the bottom on value.
Dutch Chocolate is a well-regarded flavor and mixes reasonably for a casein, helped by the natural-sweetener formula that avoids a chemical aftertaste for people who dislike sucralose. Like all stevia-forward products the taste is a preference, and it's still casein-thick, so it scores solidly without topping the instantized mainstream picks.
“Grass-fed micellar casein (Truly Grass-Fed dairy).”
The grass-fed sourcing is a disclosed brand claim tied to a named supplier (Truly Grass-Fed), which is more specific than a generic 'grass-fed' label. It's plausible and transparent, but it's a sourcing claim from the manufacturer rather than an independently audited certification on the listing.
“Naturally sweetened — no artificial sweeteners, dyes or fillers.”
The label confirms stevia and natural flavors with no artificial sweeteners, dyes or fillers — a genuinely clean, verifiable ingredient list.
“26 g of protein per serving.”
The listing states 26 g protein per serving — one of the higher doses in this lineup, confirmed on the label.
“Third-party / lab tested for purity.”
Legion does publish lab analyses and is transparency-focused, so the testing claim isn't empty — but it's brand-commissioned lab testing, not an independent Informed Sport or NSF banned-substance certification. Per source-provenance honesty, that's a manufacturer signal, not the third-party seal the certified picks carry.
“Fully transparent, fully-disclosed label.”
Legion discloses its complete formula and ingredient amounts, consistent with its transparency positioning — a verifiable practice and a genuine differentiator from proprietary-blend products.
Legion fills a specific niche: you want grass-fed sourcing and no artificial sweeteners, but you don't want to go fully unflavored. It delivers 26 g of Truly Grass-Fed micellar casein, stevia-sweetened, no artificial dyes or fillers, with a fully-disclosed label. If that combination is your priority, it's the strongest flavored option for it in the lineup.
At 26 g per serving it ties for the top of the protein-per-serving range in this roundup, edging the 24-25 g picks. For a pre-bed scoop where you want protein without a big calorie load, a higher-protein, low-added-sugar serving is a genuine plus — and the natural-sweetener formula keeps the macro clean.
Legion is transparency-focused and publishes its own lab tests, but it carries no Informed Sport or NSF seal. Brand-run testing is a real signal, but it isn't independent banned-substance certification, and we won't dress it up as one. If you're a tested athlete or you specifically want a third-party seal, Ascent (#3) or NOW (#4) — both Informed Sport — are the verified choices.
At roughly $1.50 a serving with fewer servings per tub, it's a premium buy, and value is its weakest axis. That's consistent with quality-over-price: it earns its spot on sourcing and clean formulation, not on cost, and it deliberately isn't ranked above better-value tubs just for being grass-fed. If grass-fed isn't a must for you, Dymatize (#1) delivers the pure form for far less.
Legion Casein+ is the pick for someone who wants a clean premium label but doesn't want to go fully unflavored. It serves 26 g of micellar casein — one of the higher doses here — from grass-fed dairy, sweetened with stevia and free of artificial dyes and fillers, with the fully-disclosed label Legion is known for. The downsides are price-related: it costs more per serving and gives fewer servings per tub than the value leaders, and unlike Ascent and NOW it carries no Informed Sport or NSF seal — the brand's own lab testing is a manufacturer signal, not an independent certification. If you need a certified tub, go Ascent (#3); if you want the pure form at better value, Dymatize (#1). But if grass-fed sourcing and natural sweetening in a flavored casein are what you're after, this earns its place. (Dairy protein — low lactose, not lactose-free.)
Check Legion · grass-fed micellar casein · 26g protein · naturally sweetened · no artificial dyes on AmazonThe certified clean alternative: also stevia-sweetened with no artificial anything, at 25 g — but backed by a genuine Informed Sport seal Legion lacks. The pick if you want the same natural sweetening plus real third-party testing.
See it on the list →The other grass-fed option, taken further: cold-processed, pasture-raised and additive-free at 25 g — but unflavored. The pick if grass-fed sourcing matters most and you'll flavor it yourself for a lower cost per gram.
See it on the list →The best overall: 100% micellar at 25 g with a smoother-mixing chocolate and far better value — but sucralose-sweetened and not grass-fed. The pick if pure form and value beat the grass-fed, stevia story for you.
See it on the list →Casein taken before sleep raised overnight muscle protein synthesis versus placebo — supporting a 26 g grass-fed micellar scoop like Legion's for the overnight window.
Training gains tracked total protein (~1.6 g/kg/day) with no clear source advantage — context for the fact that grass-fed sourcing is a quality/values choice, not a muscle-growth upgrade.
