Best Protein Powders, Scored on a Public Rubric
Protein is the fastest-growing supplement category on Amazon and one where third-party testing matters most: a 2018 Clean Label Project study found detectable heavy metals (lead, cadmium, arsenic) in 70% of protein powders tested, including several big-box brands. We weighted that heavily in our scoring. Below are six widely-available protein powders — whey isolate, whey concentrate, casein, and plant — scored on our transparent 6-metric rubric.
Top pick
Optimum Nutrition — Gold Standard 100% Whey
24g protein / 120cal, 5.5g BCAAs, Informed Choice certified on listed batches
At a glance
Tap a row to check price · tap a header to sort| # | Best for | Price | ||
|---|---|---|---|---|
| 1 | | Best mainstream whey concentrate | 8/10 | $79.99$89.99 |
| 2 | | Best hydrolyzed whey isolate | 8/10 | $108.99 |
| 3 |  | NSF Certified for Sport | 8.2/10 | $59.95 |
| 4 |  | Cleanest label without artificial sweeteners | 8.8/10 | $59.99 |
| 5 |  | Widely available isolate blend at moderate price | 6.8/10 | $76.78 |
| 6 |  | Best plant-based pick | 7.8/10 | $41.99 |
Prices pulled from Amazon as of Jul 6, 2026 and are subject to change. The price shown on Amazon at checkout applies.
How we scored
Every product below is scored on six metrics, 0-10 each, with the weighting described on how we review. The criteria specific to this category:
- Independent third-party certification (NSF Certified for Sport, Informed Sport, or Informed Choice).
- Protein per calorie — isolates and hydrolysates score higher than concentrates on this metric.
- No proprietary blends — full amino-acid breakdown disclosed on the label or brand site.
- Sweetener and additive transparency, including whether the sweetener system matches the label claims.
- Price per gram of actual protein, not price per serving or per scoop.
- Digestibility track record — published DIAAS (Digestible Indispensable Amino Acid Score) or practical tolerability data.
What to know before buying
- Daily protein target for general health is roughly 0.8g/kg body weight; most strength-training adults do better at 1.6-2.2g/kg. A powder is a convenience, not a requirement.
- Whey isolate (≥90% protein by weight) is the cleanest per-gram choice if you tolerate dairy. Whey concentrate (~80%) is cheaper and works for most people.
- Plant protein benefits from a blend (pea + rice, or pea + hemp) to round out the amino-acid profile. Pea alone is lower in methionine.
- Beware proprietary blends that list total protein before breaking down each source — often heavy on cheap fillers.
Our picks
Optimum Nutrition — Gold Standard 100% Whey
Key specs: 24g protein / 120cal, 5.5g BCAAs, Informed Choice certified on listed batches
Pros
- Informed Choice certification is batch-level and looks for banned substances
- Blend of isolate (primary) and concentrate keeps cost reasonable
- Widely available, huge flavor range
Cons
- Contains artificial sweeteners (sucralose and acesulfame-K in most flavors)
- Not all flavors are Informed Choice tested — check the certification list
Optimum Nutrition — Gold Standard 100% Whey
- Third-party testing8/10
- Bioavailability9/10
- Clinical evidence8/10
- Value8/10
- Brand transparency7/10
- Form & absorption8/10
Dymatize — ISO100 Hydrolyzed
Key specs: 25g protein / 110cal, hydrolyzed isolate, Informed Choice
Pros
- Hydrolyzed = pre-broken-down, typically easier to digest
- Very low carb and fat per serving
- Informed Choice on listed SKUs
Cons
- Premium price per gram of protein
- Artificial sweeteners in most flavors
Dymatize — ISO100 Hydrolyzed
- Third-party testing8/10
- Bioavailability10/10
- Clinical evidence8/10
- Value6/10
- Brand transparency7/10
- Form & absorption9/10
Momentous — Essential Grass Fed Whey
Key specs: 20g protein / 110cal, grass-fed whey concentrate, NSF Certified for Sport
Pros
- NSF Certified for Sport is the most rigorous consumer-facing certification
- Minimal ingredient list, no artificial sweeteners
- Transparency on farm sourcing
Cons
- Significantly more expensive per gram of protein than mass brands
- Lower protein percentage vs isolate options
Momentous — Essential Grass Fed Whey
- Third-party testing10/10
- Bioavailability8/10
- Clinical evidence8/10
- Value5/10
- Brand transparency10/10
- Form & absorption8/10
Transparent Labs — Whey Protein Isolate
Key specs: 28g protein / 120cal, grass-fed whey isolate, stevia-sweetened
Pros
- Full amino-acid disclosure, no proprietary blends
- Stevia sweetening, no artificial colors or flavors
- Third-party tested with published COAs
Cons
- Stevia aftertaste is polarizing
- Premium per-gram price
Transparent Labs — Whey Protein Isolate
- Third-party testing9/10
- Bioavailability10/10
- Clinical evidence8/10
- Value7/10
- Brand transparency10/10
- Form & absorption9/10
MuscleTech — Nitro-Tech Whey Gold
Key specs: 24g protein / 140cal, whey isolate + peptide blend
Pros
- Isolate-forward blend
- Stocked almost everywhere — rarely out of stock
Cons
- Adds 'peptides' but doesn't fully disclose peptide source ratios — modest transparency
- Artificial sweeteners and colors in most flavors
- Not currently batch-certified by NSF or Informed Sport
MuscleTech — Nitro-Tech Whey Gold
- Third-party testing5/10
- Bioavailability9/10
- Clinical evidence7/10
- Value7/10
- Brand transparency5/10
- Form & absorption8/10
Garden of Life Sport — Organic Plant-Based Protein
Key specs: 30g protein / 170cal, pea + navy bean + lentil + cranberry blend, NSF Certified for Sport
Pros
- NSF Certified for Sport — extremely rare for plant proteins
- Multi-source blend covers amino-acid profile better than pea-only
- USDA Organic
Cons
- Gritty texture typical of plant powders
- Higher calorie count per serving than whey isolate
Garden of Life Sport — Organic Plant-Based Protein
- Third-party testing10/10
- Bioavailability7/10
- Clinical evidence7/10
- Value7/10
- Brand transparency9/10
- Form & absorption7/10
Frequently asked questions
The RDA for adults is 0.8g per kg body weight, but most recent literature for active adults supports 1.2-2.0g/kg for muscle preservation and growth. The 2020 ISSN position stand concluded 1.4-2.0g/kg is safe and effective for resistance-trained individuals. A powder is a convenience — most people can hit targets with food.
Related reading
Sources
- Position of the International Society of Sports Nutrition: Protein and Exercise — Journal of the International Society of Sports Nutrition, 2017
- Clean Label Project Protein Powder Study — Clean Label Project, 2018
- Informed Sport Certification — LGC Sport Science
- NSF Certified for Sport Program — NSF International
Last verified: April 21, 2026. See our editorial policy and how we review for details on scoring and update cadence. Canonical URL: https://trustedhealthgear.com/reviews/best-protein-powder.
Optimum Nutrition — Gold Standard 100% Whey
$79.99 · on Amazon