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GNC

Pro Performance 100% Whey Protein Powder (Chocolate)

Powder · 1 Scoop (35.5g) · 25 servings · $1.40/serving

iHerbAmazon

Best for

Muscle

Ingredients (3)

Whey Protein

100%

Dose

24 g

Target

20–30 g

Form

Not listed

Calcium

130 mg

Trace amount — not scored

Iron

0.8 mg

Trace amount — not scored

Nutrition

Calories, macros & sodium.

  • Sodium80 mg

Other Ingredients (9)

CarboxymethylcelluloseThickener

Carboxymethylcellulose was the second emulsifier (with polysorbate 80) in Chassaing et al. 2015 (Nature, PMID 25731162), which showed mucus-barrier thinning, a microbiota shift toward pro-inflammatory species, low-grade inflammation, and metabolic syndrome in mice. Chassaing 2022 (Gastroenterology, PMID 34774538) tested CMC directly in a randomized controlled human feeding trial and found reduced microbial diversity and bacterial encroachment into the normally sterile mucus layer in a susceptible subset of participants. EFSA's 2018 re-evaluation could not establish a safe level due to data gaps. For a purely textural excipient, the gut-barrier risk profile is unfavorable when safer thickeners are widely available.

SucraloseSweetener

Dose context matters. As a trace excipient in a tablet coating or capsule, the amount is minimal and not a meaningful concern. The evidence below applies to the gram-level intakes typical of sweetened protein powders, pre-workouts, and drink mixes: a 2022 human trial (Suez et al., Cell) showed sucralose disrupts gut bacteria and worsens blood sugar control in healthy adults, and a 2023 study (Schiffman et al.) found that sucralose-6-acetate — a compound formed when sucralose is digested — was genotoxic to human cells in vitro. It remains an artificial sweetener with no nutritional purpose.

Natural FlavorsFlavor

Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

CocoaFlavor

Common food ingredient used for chocolate flavoring in supplements

Guar GumThickener

Natural thickener derived from guar beans

Sea SaltFlavor

Basic food-grade salt used for taste in supplements

Sunflower LecithinEmulsifier

Non-GMO, non-allergenic emulsifier derived from sunflower seeds

How to Take It

Take it anytime

Total daily protein is what matters — the post-workout "anabolic window" has not held up in controlled trials.

With or without food

On the label

Combine 1 scoop with cold water, milk, or your favorite beverage in a shaker cup and enjoy!

General guidance based on the ingredients, not a substitute for the label or your doctor.

Price Check

$34.88

$10$20$50

Near the median of 638 calcium supplements

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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