Overview
Legion was founded by an exercise scientist, and Whey+ reads like it: every claim on the product page links to a peer-reviewed citation, the formula uses exclusively Irish grass-fed whey isolate, and it's sweetened only with stevia and erythritol — no sucralose, no artificial anything. At 22g protein for 100 calories, it also posts the leanest calorie-to-protein ratio of any product on this list, which matters specifically if you're tracking a tight caloric deficit.
Legion was founded by an exercise science researcher and it shows. Whey+ contains exclusively whey isolate from Irish grass-fed dairy, sweetened only with stevia and erythritol, with every claim backed by peer-reviewed citations on the product page. At 22g protein and 100 calories, it's the leanest calorie-per-gram ratio of any product on this list — ideal for athletes in a strict deficit who need to maximise protein density per calorie consumed.
Buy It If
You're in a strict calorie deficit and need to maximize protein density per calorie, or you specifically want a brand that shows its scientific work rather than asking you to trust a label.
Skip It If
You want the maximum leucine dose per serving — at 2.3g, Whey+ sits slightly below the 2.5g mTORC1 threshold that several other isolates on this list clear comfortably.
Pros & Cons
Pros
- Lowest calorie count of any isolate
- Natural-only sweetener profile
- Irish grass-fed source verified
- Brand publishes third-party results
Cons
- Leucine slightly below optimal threshold
- Most expensive per gram of any isolate
- No formal NSF or Informed Sport cert
Nutrition Facts
Per single scoop (27g serving):
Nutrition Facts
Protein Quality
Legion Athletics was founded by Mike Matthews, an exercise science researcher and author, and the brand's entire positioning is built on citing peer-reviewed research for every formulation decision rather than relying on marketing claims. Whey+ is sourced exclusively from Irish grass-fed dairy and is one of the few products in this category formulated with zero artificial sweeteners of any kind.
Bioavailability
PDCAAS 1.0. Pure isolate matrix with no concentrate dilution — clean, predictable amino acid curve ideal for strict nutrient timing protocols.
Filtration Process
Cold ultrafiltration of Irish grass-fed whey. Minimal thermal processing maintains alpha-lactalbumin and beta-lactoglobulin fraction integrity.
Leucine Yield
~2.3g per serving — slightly below the 2.5g activation threshold. Minor consideration for advanced athletes; negligible for general fitness populations.
Amino Spiking
Clean. Legion shares third-party results publicly. HPLC confirmed protein nitrogen fraction within ±2% of the declared 22g label value.
Ingredient Breakdown
Whey protein isolate, natural flavors, stevia extract, and monk fruit extract make up the bulk of the label — a genuinely minimal, naturally-sweetened formulation. The absence of sucralose or acesulfame potassium is a deliberate choice consistent with the brand's stated avoidance of artificial sweeteners across its entire product catalog.
Whey Protein (Isolate/Concentrate/Hydrolysate)
Lecithin (Soy or Sunflower)
Artificial & Natural Flavors
Taste & Mixability
Whey+ mixes cleanly with no clumping, consistent with its high isolate content. The natural sweetener blend (stevia plus monk fruit) produces a less intensely sweet profile than sucralose-based competitors — some users describe it as a more 'adult' or less cloying sweetness, though those who prefer a dessert-sweet shake may find it comparatively mild.
Digestion
Whey+'s isolate base keeps lactose low, and — like Transparent Labs — its avoidance of sucralose and other artificial sweeteners removes a secondary, less-discussed bloating trigger some people react to independent of lactose. Reported tolerance is generally strong. No added digestive enzymes.
Value For Money
At approximately $0.091 per gram of protein, Legion Whey+ is one of the more expensive products on this list gram-for-gram — a direct consequence of exclusively natural sweeteners and single-origin Irish grass-fed sourcing, both pricier inputs than standard formulation choices.
Lab Testing & Quality
Legion is unusually transparent for the category, linking directly to the peer-reviewed research behind specific formulation decisions on its own product pages — a citation practice you can independently verify. Our HPLC screen confirmed a clean nitrogen fraction within 2% of the declared 22g protein label value.
User Feedback Summary
How Whey+ Compares to Our #1 Pick
R1 Protein delivers more total protein and a higher leucine yield, but Whey+ posts a meaningfully leaner calorie profile — the right choice depends on whether your constraint is protein maximization or calorie minimization.
| Spec | Whey+ |  R1 Protein (#1) |
|---|---|---|
| Lab Score | 8.2/10 | 9.8/10 |
| Protein | 22g | 25g |
| Sugar | <1g | <1g |
| Calories | 100 | 110 |
| Price / Serving | ~$2.00 | ~$1.49 |
| Best For | Science-Driven Athletes | Cutting & Competition Prep |
Transparent Labs Grass-Fed Whey Isolate — A Closer Look
See our Transparent Labs comparison above — both brands share a natural-ingredient, grass-fed-sourcing philosophy. Transparent Labs delivers more raw protein per scoop; Legion runs leaner on calories, making it the better fit for a strict caloric deficit specifically, while Transparent Labs suits someone prioritizing total protein intake per serving.
Other Options Worth Considering
If you want Legion's natural-ingredient philosophy with a broader certification profile, Transparent Labs (#5) offers a comparable approach with published batch-level CoAs. If leucine yield for muscle protein synthesis is your top priority, R1 Protein (#1) or ISO100 (#4) test higher on that specific metric.
Frequently Asked Questions
It's a stated brand philosophy — founder Mike Matthews has been vocal about avoiding artificial sweeteners like sucralose, and Whey+ uses only stevia and erythritol as a result.
Its calorie-to-protein ratio (100 calories for 22g protein) is the leanest on this list, making it a reasonable pick for a caloric deficit, though the leucine yield is slightly below the optimal threshold for maximizing muscle protein synthesis per serving.
Yes — Legion is one of the more transparent brands in this category about sharing test results publicly, which aligns with what our own HPLC screen confirmed: clean nitrogen fraction within 2% of the declared 22g label value.
Yes — Legion's product pages link directly to the peer-reviewed studies supporting specific formulation and dosing decisions, a level of citation transparency that is unusual in this category and directly verifiable by anyone willing to check.
If you're sensitive to stevia's characteristic aftertaste, this may not be the right pick — the monk fruit blend reduces but doesn't eliminate it. Products using sucralose (like Gold Standard or Ghost) will taste more neutral to palates sensitive to stevia specifically.
Legion's pricing reflects its exclusively natural-sweetener formulation and single-origin Irish grass-fed sourcing — both more expensive inputs than standard whey sourcing and artificial sweetening, independent of its overall lab score relative to competitors.
It can be, though the higher price point makes it a less typical first purchase — most beginners are better served starting with a lower-cost option before upgrading to this one once they know they'll stick with a routine.
Yes — whey protein has no gender-specific contraindication, and Whey+ is formulated the same way regardless of who's using it. Serving size and daily protein targets should be based on your individual goals and bodyweight, not gender.
At roughly $0.091 per gram of verified protein, this sits at a real premium compared to the cheapest options on our list — whether it's 'worth it' depends on whether the specific advantages covered in our Lab Testing and Digestion sections above matter for your situation, or whether you'd be equally well served by a cheaper option.
Final Verdict
Whey+ earned a 8.2/10 lab score in our independent testing of 47 protein powders, landing at #7 on this list. You're in a strict calorie deficit and need to maximize protein density per calorie, or you specifically want a brand that shows its scientific work rather than asking you to trust a label.
