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Protein powder is one of the few supplements with nearly universal evidence. But not all protein is equal. We rank every product by protein per dollar, leucine content, third-party testing, and what actually matters for muscle protein synthesis -- not marketing claims about "grass-fed" or "cold-processed."
Whey protein is the gold standard for muscle protein synthesis (MPS). It has the highest leucine content (~10-12% by weight), fastest digestion rate, and the most extensive research base. A meta-analysis by Morton et al. (2018) in the British Journal of Sports Medicine showed whey protein supplementation increased lean mass gains by 0.3kg on average over resistance training alone.
Casein digests slower than whey, providing a sustained amino acid release over 6-7 hours. This is theoretically beneficial before sleep, but head-to-head studies show no meaningful difference in muscle gains when total daily protein is matched. Choose based on preference, not perceived timing advantage.
Plant protein (pea, rice, soy blends) has lower bioavailability (PDCAAS 0.89 vs 1.0 for whey) and ~40% less leucine per serving. Joy et al. (2013) showed pea protein produced comparable muscle gains to whey over 12 weeks, but at matched higher doses. If you use plant protein, aim for 30-35g per serving to match the anabolic effect of 20-25g whey.
| Factor | Whey | Casein | Plant |
|---|---|---|---|
| Leucine Content | ~10-12% | ~8-9% | ~6-7% |
| PDCAAS Score | 1.0 | 1.0 | 0.89 |
| Digestion Speed | Fast (1-2h) | Slow (6-7h) | Moderate (2-3h) |
| MPS Peak | Highest | Lower peak, longer | Lower peak |
| Lactose Content | Low (isolate) | Moderate | None |
| Cost per 25g | $0.60-2.20 | $0.80-1.50 | $0.75-1.50 |
| Third-Party Testing | Common | Less common | Growing |
| Best Timing | Post-workout | Pre-bed | Any time |
| # | Product | Score | Verdict | Per Serving | Protein | g/$ | Type | Certification | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | MomentousTop Pick Grass-Fed Whey Protein | 88 | Best in Class | $2.20 | 24g | 10.9 | Whey Isolate | NSF Sport | Review |
| 2 | 87 | Best in Class | $1.32 | 25g | 18.9 | Whey Hydrolysate | Informed Choice | Review | |
| 3 | Optimum Nutrition Gold Standard 100% Whey | 86 | Best in Class | $1.21 | 24g | 19.8 | Whey Blend | Informed Choice | Review |
| 4 | Transparent Labs 100% Grass-Fed Whey Protein Isolate | 84 | Worth Buying | $2.00 | 28g | 14.0 | Whey Isolate | GMP | Review |
| 5 | MyproteinBest Value Impact Whey Protein | 82 | Worth Buying | $0.62 | 21g | 33.9 | Whey Concentrate | Informed Sport | Review |
| 6 | Garden of LifeBest Plant-Based Raw Organic Protein | 75 | Solid Choice | $1.43 | 0g | 0.0 | Plant-Based | NSF Sport | Review |
| 7 | Designs for Health PaleoMeal | 74 | Solid Choice | $4.13 | 17g | 4.1 | Whey Blend | GMP | Review |
| 8 | 73 | Solid Choice | $1.35 | 0g | 0.0 | Plant-Based | USDA Organic | Review | |
| 9 | 72 | Solid Choice | $1.50 | 0g | 0.0 | Plant-Based | USDA Organic | Review |
Premium whey isolate with an excellent amino acid profile. NSF Certified for Sport. The price is steep, but the quality is verifiable.
One of the purest whey isolates on the market. 25g protein with less than 1g sugar and fat per serving. Hydrolyzed for rapid absorption. Informed Choice certified.
The industry benchmark for two decades. 24g protein, solid amino profile, and the best price-to-quality ratio in the whey protein market.
Lives up to its brand name with full ingredient transparency. 28g protein per serving, naturally sweetened, no artificial ingredients. Premium pricing reflects the clean label approach.
The value king of whey protein. 21g protein per serving at the lowest price in the tested category. Whey concentrate, not isolate -- but for most people, that is fine.
The best plant-based option for those who need it. Organic, complete amino profile, but plant protein is inherently less bioavailable than whey. Honest about what it is.
A paleo-friendly meal replacement protein using beef protein isolate. Clean ingredient list, no dairy or soy, but extremely expensive for what you get. The 'paleo' branding drives a massive price premium over equivalent protein sources.
A solid plant-based option for the mass market. USDA Organic with 21g protein from pea, brown rice, and chia. Tastes better than most plant proteins, but bioavailability still trails whey.
USDA Organic plant-based protein blend delivering 21g protein per serving from pea, brown rice, and chia. A solid vegan option with clean ingredients, though the amino acid profile and digestibility lag behind whey. Reasonable value for the organic plant protein category.
1.6-2.2g/kg bodyweight per day. The ISSN position stand (Jager et al., 2017) identifies 1.6g/kg as the minimum for optimal MPS. Going above 2.2g/kg shows no additional benefit in most studies.
1.2-1.6g/kg is sufficient for non-athletes. The RDA of 0.8g/kg is a minimum to prevent deficiency, not an optimal target. Most active people benefit from more.
20-40g per meal maximizes MPS per feeding. The 'leucine threshold' requires approximately 2.5-3g leucine per meal to maximally stimulate MPS. Whey achieves this at ~25g; plant protein needs ~35g.
Less important than total daily intake. The 'anabolic window' is closer to 4-6 hours, not 30 minutes. Distribute protein across 3-5 meals for convenience, not because timing is critical.
30-40g casein or slow-digesting protein before sleep can support overnight MPS. Snijders et al. (2015) showed pre-sleep protein improved muscle mass and strength gains over 12 weeks of training.
The amino acid profile of grass-fed vs conventional whey is virtually identical. You are paying 40-100% more for a farming practice, not a better protein.
Standard whey processing temperatures do not denature the protein in any way that affects amino acid content or bioavailability. This is marketing language for a non-issue.
Whey protein already contains ~25% BCAAs. Adding supplemental BCAAs on top of adequate protein intake is redundant. Save your money.
Technically true, but the practical difference in muscle gains vs standard isolate is negligible. You do not need to pay a premium for faster absorption when total daily protein is what matters.
Joy et al. (2013) showed equivalent muscle gains from pea vs whey protein. The key is consuming 25-30% more plant protein per serving to compensate for lower leucine content and bioavailability.
Myprotein Impact Whey Protein at $0.62/serving offers the best protein per dollar with Informed Sport certification. For pure quality regardless of price, Momentous Grass-Fed Whey Protein (score: 88) leads with NSF Certified for Sport verification. For most people, ON Gold Standard offers the best balance of quality and value.
For most people, no. Whey concentrate (80% protein) and isolate (90%+ protein) produce the same muscle gains when daily protein targets are met. Isolate is worth the premium only if you are lactose sensitive (isolate has much less lactose), counting calories precisely, or are a competitive athlete wanting maximum protein density per scoop.
Yes, when total daily protein is matched. Joy et al. (2013) demonstrated equivalent muscle gains from pea protein vs whey over 12 weeks. The catch: plant protein has lower leucine content and bioavailability, so you need about 30-35g per serving to match the anabolic effect of 20-25g whey. If you are vegan, this is not a problem -- just use more.
No, in healthy individuals. A systematic review by Devries et al. (2018) found no adverse renal effects from high-protein diets (up to 2.2g/kg) in people without pre-existing kidney disease. If you have existing kidney issues, consult your nephrologist before increasing protein intake.
Whenever is most convenient for hitting your daily target. The 'anabolic window' is a 4-6 hour range, not 30 minutes. Post-workout is fine, but so is any other time. Total daily protein intake matters far more than timing. If you train fasted, having protein within 2 hours post-workout is a reasonable practice.
We rank supplements across 15+ categories using the same evidence-first methodology. No sponsorships, no affiliate bias -- just science.