Brand-quality audit Published Jun 30, 2026 Recalibrated Jul 1, 2026

CytoSport (Muscle Milk)

Mainstream sports protein with real NSF powder verification, good value, and a messy but mostly historical transparency and safety record.

Composite trust

69 /100 Mixed

Quality

60 /100

Mixed

Formulation

76 /100

Adequate

Transparency

48 /100

Poor

Safety

62 /100

Mixed

Value

84 /100

Strong

Sentiment

83 /100

Strong

Top strengths

Value: mainstream pricing with NSF Certified for Sport powder verification
Social sentiment: strong retail ratings and major athlete or NFL visibility
Formulation: high protein or 5 g creatine doses in sampled current products
Athlete safety: NSF Certified for Sport coverage on powder products

Key concerns

Transparency: no public COA portal, batch lookup, sourcing map, or current facility-certification package found
Safety history: old FDA warning, heavy-metal litigation history, recalls, and label-claim settlement remain relevant after recency discounts
Clean-label fit: some powders are higher calorie or use sweeteners, flavors, and fortified extras

Badges

NSF certified Third-party tested Effective dosing Athlete-safe Fair value Transparent pricing Community favorite

Axis by axis

What the evidence shows

Quality

60/100 Mixed

Quality starts from 50 and nets to an indicative 60 after current NSF Certified for Sport positives are offset by old heavy-metal and spoilage incidents. The current athlete-safety testing signal is real, but public COAs, current NSF GMP facility verification, and batch-level contaminant results were not found in this audit.¹⁵⁶²⁰²³

Formulation

76/100 Adequate

Formulation starts from 50 and nets to an indicative 76. The strongest positive is effective headline dosing across the sampled line, while the main limits are lack of brand-specific clinical trials and a formula style that can include more calories, fats, sweeteners, flavors, and fortified extras than minimalist protein powders.⁷⁸¹²¹⁵³⁵

Transparency

48/100 Poor

Transparency starts from 50 and nets to an indicative 48. Ownership, labels, and NSF testing disclosures are clear, but the brand loses ground for old but documented labeling and disclosure disputes plus the absence of public COAs, sourcing detail, and current facility transparency.⁵¹⁶¹⁸²¹²⁶

Safety

62/100 Mixed

Safety starts from 90 and nets to an indicative 62. There is no recent last-2-years safety event found, but CytoSport has a documented historical FDA warning, heavy-metal litigation history, a 2016 Muscle Milk spoilage recall, a 2021 Evolve allergen recall, and a 2020 label-claim settlement, all applied with recency discounts and legal-status caveats.¹⁸²⁰²³²⁵²⁶

Value

84/100 Strong

Value starts from 50 and nets to an indicative 84. CytoSport earns strong value credit because Muscle Milk pairs mainstream pricing and broad availability with NSF Certified for Sport on powders, although it is not the cheapest or cleanest-label protein option.¹⁵³²³⁴³⁵

Sentiment

83/100 Strong

Social sentiment starts from 60 and nets to an indicative 83. Muscle Milk is broadly recognized, reviewed positively enough at retail, and supported by major sports partnerships, but it is not the clear Reddit or clean-label enthusiast favorite.²⁸²⁹³⁶³⁷³⁸

The rubric

How every score was built

Each axis opens at a category baseline, then moves only on dated, cited evidence, never a gut call. That is the whole difference from a star rating: every one of these 29 adjustments is a receipt you can check.

Points	What moved the score
Quality baseline 50 60 Mixed
+9	NSF Certified for Sport coverage across powder portfolio ¹²³⁴⁵ Current as of 2026 official and NSF directory pages. Pattern calculation: PepsiCo states all Muscle Milk powder products are NSF Certified for Sport, and sampled NSF listings confirm Genuine Protein Powder, 100% Whey, and Pro Series Creatine. Because this appears broad for powders but not the full ready-to-drink portfolio, I applied 90% of the +10 upper value, rounded to +9. · full weight
+8	Third-party testing disclosed through NSF Certified for Sport ⁵⁷⁸ Current product pages. NSF screening is disclosed, but product-level COAs and full contaminant panels are not public, so this uses the low end of the +8 to +12 range. · full weight
−5	Historical independent heavy-metal concern in protein products ²⁰²¹²² 2010 to 2012, more than 10 years ago. Base contamination quality concern selected at -20 because Consumer Reports and related litigation concerned heavy metals, then discounted 25% for age: -20 x 0.25 = -5. · 25% weight
−2	Historical voluntary spoilage recall affecting Muscle Milk drinks ²³²⁴ June 2016, slightly more than 10 years ago as of 2026-07-01. Base minor voluntary recall quality penalty selected at -8 because it was a packaging spoilage issue with no reported illnesses, then discounted 25%: -8 x 0.25 = -2. · 25% weight
—	Not scored No public batch COA portal, ISO 17025 lab scope, complete manufacturing-site list, or current public contaminant-testing panel was found. The audit verified sampled NSF product listings but did not exhaustively enumerate every SKU and lot.
Formulation baseline 50 76 Adequate
+14	Effective dosing in sampled current product line ⁷⁸⁹¹⁰¹¹¹³¹⁴ Current labels and product pages. Pattern calculation: 7 of 7 sampled current products had meaningful headline doses, including 25 g to 50 g protein per serving or 5 g creatine monohydrate. That is 100% of the sampled set, so I awarded near the top of the +10 to +15 range: +14. · full weight
+5	Fast and slow protein combinations with plausible recovery rationale ⁷⁸¹⁰ Current product pages. Awarded low to mid range within +5 to +8 because Muscle Milk uses whey and casein-style milk proteins for mixed digestion speeds, but I did not find brand-owned clinical trials on current products. · full weight
+5	Functional protein forms and creatine monohydrate ³⁹¹⁵ Current and 2026 sources. Awarded +5 because sampled products include whey isolate or concentrate, ultra-filtered milk in reformulated shakes, and 5 g creatine monohydrate. This is not the full premium-ingredient award because branded trademarked inputs were not found as a broad pattern. · full weight
+4	Headline active amounts disclosed rather than hidden in proprietary blends ⁷⁸⁹¹⁰¹¹¹² Current labels and product pages. Partial +4 because total protein, creatine, calories, carbohydrates, and key nutrients are disclosed, but protein sub-fractions are not fully quantified. · full weight
+3	2026 ready-to-drink reformulation reduced artificial-ingredient burden ¹⁵ May 2026, within the last 2 years. Awarded modest +3 because the reformulated shake line claims ultra-filtered milk and no artificial sweeteners, flavors, or added colors, but this improvement applies to ready-to-drink shakes and not necessarily all powders. · full weight
−5	Calorie, fat, and additive tradeoffs in powder formulas ¹²²⁸²⁹³⁰³¹ Current labels and 2024 to 2026 expert reviews. Low severity negative because sampled powder products are not underdosed, but expert reviewers flagged higher calories, carbs, fat, sucralose, artificial flavors, large serving sizes, and mixed taste or texture feedback. · full weight
—	Not scored This was a sampled label audit, not a full SKU-by-SKU line audit. I did not find brand-specific randomized trials, amino acid assay data, or full protein-fraction quantities for each formula.
Transparency baseline 50 48 Poor
+10	Ownership and brand structure are clearly disclosed ⁵¹⁶ Current official Muscle Milk page and 2019 transaction release. Awarded +10 within the +8 to +12 ownership disclosure range because PepsiCo, Gatorade, Hormel, and the Muscle Milk acquisition history are disclosed clearly. · full weight
+8	Testing disclosure through NSF Certified for Sport on powders ¹⁵⁷⁸ Current. Awarded +8 within the third-party testing disclosure range because NSF status is disclosed, but public COAs and batch-specific lab results were not found. · full weight
+4	Clear public nutrition and product labeling via SmartLabel and product pages ⁷⁸¹¹¹²¹³¹⁴¹⁷ Current. Awarded +4 within the +3 to +5 clear labeling range for accessible nutrition panels, product FAQs, and contact channels. · full weight
−5	FDA warning letter for misleading milk and nutrient-content labeling ¹⁸¹⁹ June 2011, more than 10 years ago. Base misleading-label penalty selected at -20 because FDA called specific labels false or misleading, then discounted 25% for age: -20 x 0.25 = -5. · 25% weight
−8	2020 court-approved class settlement over protein, lean, and fat-content allegations ²⁶²⁷ Final approval in October 2020, 5 to 10 years ago. Base transparency penalty selected at -15 because the allegations concerned label and advertising representations. Discounted 50% for age: -15 x 0.50 = -7.5, rounded to -8. The settlement resolved allegations, and CytoSport denied wrongdoing according to settlement reporting. · 50% weight
−5	Historical Proposition 65 and related nondisclosure settlement allegations involving heavy metals ²⁰²¹²² 2010 to 2012, more than 10 years ago. Base misleading or nondisclosure penalty selected at -20, discounted 25% for age: -20 x 0.25 = -5. CytoSport denied the allegations according to settlement reporting. · 25% weight
−6	Limited sourcing and current facility transparency for a large mainstream brand ⁵⁶¹⁷ Current audit. Applied low end of the premium-brand no-sourcing or no-facility-info penalty because ownership and contact information are clear, but ingredient sourcing, supplier countries, current manufacturing locations, and public batch testing were not found. · full weight
—	Not scored No public COA portal, batch lookup, sourcing map, complete supplier list, or current facility-certification package was found. No direct COA request test was performed, so there is no COA-refusal finding.
Safety baseline 90 62 Mixed
−6	FDA warning letter for misbranding and misleading labels ¹⁸¹⁹ June 2011, more than 10 years ago. Base FDA warning-letter penalty selected at -25 because FDA identified significant labeling violations, then discounted 25%: -25 x 0.25 = -6.25, rounded to -6. · 25% weight
−6	Heavy-metal lab findings and related California settlement history ²⁰²¹²² 2010 to 2012, more than 10 years ago. Base contamination or alleged contamination penalty selected at -24 because Consumer Reports used outside lab testing and related litigation alleged heavy metals. Discounted 25% for age: -24 x 0.25 = -6. CytoSport denied the allegations according to settlement reporting. · 25% weight
−2	2016 voluntary Muscle Milk drink recall for potential premature spoilage ²³²⁴ June 2016, slightly more than 10 years ago. Base minor voluntary recall penalty selected at -8 because it was a packaging spoilage issue, limited to certain code dates, and the notice reported no confirmed illnesses or injuries. Discounted 25%: -8 x 0.25 = -2. · 25% weight
−6	2021 CytoSport Evolve voluntary allergen recall for undeclared soy risk ²⁵ May 2021, 5 to 10 years ago as of 2026-07-01. Base undisclosed-allergen penalty selected at -12 because the recall involved soy cross-contamination risk for allergic consumers, limited lots, and no reported illnesses. Discounted 50%: -12 x 0.50 = -6. · 50% weight
−8	2020 class action settlement over Muscle Milk protein and lean-label allegations ²⁶²⁷ October 2020 final approval, 5 to 10 years ago. Base class-action penalty selected at -15 due to label-accuracy allegations affecting powders and ready-to-drink products, then discounted 50%: -15 x 0.50 = -7.5, rounded to -8. The settlement resolved allegations, and CytoSport denied wrongdoing according to settlement reporting. · 50% weight
—	Not scored This audit used public FDA, court, settlement, recall, and testing sources. It did not include FOIA inspection records, non-public adverse-event reports, or internal corrective-action documentation.
Value baseline 50 84 Strong
+12	Premium is partly justified by NSF Certified for Sport coverage on powders ¹⁵⁷⁸³² Current. Awarded low end of +12 to +18 because NSF Certified for Sport is a real value add for athletes, but the brand lacks public COAs and broad sourcing transparency. · full weight
+12	Market-rate to favorable protein cost in sampled pricing ³²³³³⁴³⁵ Current 2026 pricing pages and 2026 ConsumerLab cost context. Pattern calculation: sampled Muscle Milk prices include direct RTD pricing at $2.33 per 26 g shake, Walmart multipack pricing around $1.36 per 26 g shake, and bulk 100% Whey at $85.99 for 5 lb. ConsumerLab reports most protein products cost about $1 to $2 per 20 g protein, with approved products ranging from $0.62 to $2.86. Sampled Muscle Milk examples fall within or near that market band, so I awarded the low end of +12 to +18 for fair to favorable pricing. · full weight
+6	Transparent direct pricing and subscription or bulk discounts ³²³³ Current. Awarded +6 because Gatorade's direct pages disclose unit prices, order quantities, and discount tiers without evidence of hidden fees in this audit. · full weight
+4	Bulk discounts available for teams and high-volume buyers ³²³³ Current. Awarded +4 within the +3 to +6 range because direct pages show 5% to 25% bulk or subscription-style savings depending on product and volume. · full weight
—	Not scored This value analysis used sampled U.S. pricing from Gatorade and Walmart plus ConsumerLab market context. It did not scrape all retailers, all flavors, warehouse-club prices, or coupon histories.
Sentiment baseline 60 83 Strong
+8	High retailer review signal for sampled Pro Series product ²⁸ Walmart reviews visible in 2026, including reviews from 2025 and 2026. Awarded +8 in the retailer-rating spirit of the Amazon high-rating rubric because the sampled product shows 4.6 out of 5 across 793 ratings, but not the full +12 because this is one retailer and one product page. · full weight
+7	Generally positive expert-review sentiment with clear caveats ²⁹³⁰³¹ 2024 to 2026 reviews. Awarded +7 because Garage Gym Reviews and BarBend describe Muscle Milk as useful, high-protein, and widely available, while also flagging calories, artificial ingredients, taste, and serving-size caveats. · full weight
+8	Strong athlete and sports-marketing presence ⁵³⁸³⁹ 2022 to 2026 official and campaign sources. Awarded +8 because Muscle Milk is an official NFL sports protein drink sponsor and has athlete campaigns with Candace Parker, Julio Rodriguez, Christian Pulisic, and Ilona Maher. This is strong influencer presence, but it is not the same as organic practitioner adoption. · full weight
—	Not scored Direct Reddit thread sampling was limited by search availability, and Trustpilot volume was not found. Social scoring relies on retailer reviews, expert-review sources, official athlete partnerships, and third-party Reddit-summary pages.

Best for

Competitive athletes who want a widely available protein powder with NSF Certified for Sport verification.[^1][^5][^7][^8]
Shoppers who prioritize high protein per serving, convenience, and mainstream retail availability over public COAs or minimalist ingredient lists.[^7][^8][^11][^32]
Teams, gyms, or high-volume buyers that can use direct bulk pricing and sports-focused products in the Gatorade portfolio.[^5][^32][^33]

Skip if

You require public batch COAs, heavy-metal reports, ingredient-sourcing disclosures, or current manufacturing-site transparency before buying.[^5][^6][^17]
You want a lean whey isolate or very clean-label powder with minimal sweeteners, flavors, calories, and fortified extras.[^12][^28][^29][^31]
You have severe milk, soy, or allergen concerns and are not willing to verify the exact current label and allergen panel before use, especially given CytoSport's historical Evolve soy recall and Muscle Milk's milk-derived ingredients.[^11][^12][^25]

Questions

What shoppers ask about CytoSport (Muscle Milk)

What is the highest rated protein powder on the market?

There is no single universally highest-rated protein powder because rankings differ by testing method, taste, price, and goal. In the sources reviewed, Garage Gym Reviews named Transparent Labs Whey Protein Isolate its 2026 best overall pick, while a Reddit-summary analysis found Optimum Nutrition, Dymatize, and MyProtein leading Reddit powder discussions. Muscle Milk is credible and widely available, but it was not the clear consensus number one in those sources.³⁶⁴⁰

Why do doctors say no to protein powder?

Doctors usually do not say all protein powder is bad. They may caution against it for people with kidney disease, allergies, pregnancy-specific concerns, excessive total protein intake, or products with contaminant risk. Consumer Reports has warned that frequent use of some protein drinks can increase heavy-metal exposure, and ConsumerLab notes protein products vary in quality, cost, and label accuracy.²⁰³⁵

What is CytoSport?

CytoSport is the company behind Muscle Milk. Hormel completed the sale of CytoSport to PepsiCo in 2019, and Muscle Milk now sits in the Gatorade portfolio with ready-to-drink shakes, powders, and related protein products.⁵¹⁶

Does Muscle Milk really work?

Muscle Milk can work as a convenient way to add protein, and sampled products provide meaningful doses such as 25 g to 50 g protein per serving or 5 g creatine in the creatine product. That said, I did not find brand-specific clinical trials proving Muscle Milk is superior to other protein sources, so the strongest evidence is general protein-plus-resistance-training evidence rather than unique Muscle Milk evidence.⁷⁸⁹³⁵

Which is the no. 1 protein powder?

There is no objective permanent number one. Garage Gym Reviews picked Transparent Labs Whey Protein Isolate as its best overall protein powder in 2026, while Reddit-summary data favored Optimum Nutrition and Dymatize among user discussions. The best choice depends on whether you prioritize testing, price, taste, ingredient simplicity, athlete certification, or digestion.³⁶⁴⁰

What is the #1 protein in the world?

If you mean protein type, whey is often the most popular protein powder type because it is complete and quickly digested, according to ConsumerLab's general protein review. If you mean brand, there is no universal global number one in the evidence reviewed. Reddit-summary data and expert roundups point to different leaders depending on the audience and scoring method.³⁵³⁶⁴⁰

Sources

1. Certified Products Search (2026)
2. Official Certified for Sport Product Certification Listing: Muscle Milk Genuine Protein Powder Strawberries N Creme (2026)
3. Official Certified for Sport Product Certification Listing: Muscle Milk 100% Whey (2026)
4. Official Certified for Sport Product Certification Listing: Muscle Milk Pro Series Creatine Unflavored (2026)
5. About Us: Contact Muscle Milk (2026)
6. NSF GMP Listings Search: CytoSport (2026)
7. Genuine Protein Powder Chocolate 4.94 lb (2026)
8. Pro Series Protein Powder Supplement (2026)
9. Creatine Supplement Powder Unflavored 1.1 lb (2026)
10. Gainer Protein Powder Supplement (2026)
11. Muscle Milk Genuine Chocolate Protein Shake SmartLabel (2026)
12. Muscle Milk Genuine Vanilla Flavor Protein Powder SmartLabel (2026)
13. Muscle Milk Plant Protein Caramel Vanilla SmartLabel (2026)
14. Muscle Milk Plant Protein Chocolate SmartLabel (2026)
15. Muscle Milk Reformulates Its Protein Shakes with Ultra-Filtered Milk (2026)
16. Hormel Foods Finalizes the Sale of CytoSport to PepsiCo (2019)
17. Contact Muscle Milk (2026)
18. Warning Letters: Cytosport Inc 6/29/11 (2011)
19. About Warning and Close-Out Letters (2026)
20. Investigation: Tests Reveal Contaminants in Many Protein Drinks (2010)
21. Second Amended Settlement Agreement, Release, and Consent Judgment: Nasseri v. CytoSport (2012)
22. CytoSport Muscle Milk and Monster Milk Class Action Settlement (2012)
23. HP Hood LLC Voluntarily Recalls Protein Drinks From Its Sacramento Facility Due To Premature Spoilage (2016)
24. Muscle Milk Reviews by ConsumerLab.com with Ratings from Quality Tests (2016)
25. Evolve Issues Allergy Alert on Undeclared Soy in Vanilla Bean and Double Chocolate 4 Pack Protein Shakes (2021)
26. Clay v. Cytosport Final Approval Order (2020)
27. CytoSport and/or Muscle Milk Class Action Settlement (2020)
28. Customer Reviews for Muscle Milk Pro Series Protein Powder Supplement (2026)
29. Lab-Tested: Muscle Milk Review (2026) (2026)
30. Muscle Milk Review (2026), Tested and Reviewed by Experts (2026)
31. Muscle Milk Pro Series Review (2026) (2026)
32. Bulk Protein: Powders and Bars (2026)
33. Muscle Milk Protein Shake Chocolate 11 fl oz (2026)
34. Muscle Milk Pro Series Protein Powder and Similar Walmart Listings (2026)
35. Protein Powders and Shakes Review (2026)
36. Protein Powder Reviews from Reddit (2026)
37. Protein Shakes Reviews from Reddit (2026)
38. Julio Rodriguez and Christian Pulisic Join Candace Parker on Muscle Milk Athlete Roster (2024)
39. Muscle Milk, Candace Parker and National Fitness Campaign Expand Access to Strength (2023)
40. Best Protein Powder (2026): Personally Tested (2026)

Recalibrated Jul 1, 2026 · 29 scored adjustments · 37 distinct citations across 40 sources