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.
At-a-glance
| Product | Best for | Score |
|---|---|---|
| Optimum Nutrition — Gold Standard 100% Whey | Best mainstream whey concentrate + isolate blend | 8/10 |
| Dymatize — ISO100 Hydrolyzed | Best hydrolyzed whey isolate | 8/10 |
| Momentous — Essential Grass Fed Whey | NSF Certified for Sport — highest third-party testing bar | 8.2/10 |
| Transparent Labs — Whey Protein Isolate | Cleanest label without artificial sweeteners | 8.8/10 |
| MuscleTech — Nitro-Tech Whey Gold | Widely available isolate blend at moderate price | 6.8/10 |
| Garden of Life Sport — Organic Plant-Based Protein | Best plant-based pick | 7.8/10 |
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.