Performance nutrition is a $30 billion market — and the AI answer splits between the brand that sells the most and the brands that disclose the most. New 5W research ranks the 25 by how often the engines name them.
Source: 5W analysis of AI-generated responses across ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews, Q2 2026. Share represents the estimated proportion of brand citations across 60+ tracked consumer prompts spanning whey and plant protein, ready-to-drink protein, pre-workout, creatine, and recovery. Remaining ~21.8% split across ranks 16–25 and unranked brands.
Optimum Nutrition is, by its own Euromonitor-cited claim, the world's #1 sports-nutrition brand — three decades old, owned by Glanbia, and the default the AI engines return when a consumer asks the broad question: "best protein powder." On that query, incumbency wins.
But the 5W AI Visibility Index finds the answer flips the moment the query gets a qualifier. Ask for the "cleanest protein powder," the "most transparent brand," or "protein with no artificial ingredients," and the engines route to Transparent Labs and Legion — direct-to-consumer brands a fraction of the incumbents' size. They earned that citation by publishing full formulas, third-party test results, and dosing rationale that the engines can retrieve and trust.
A third surface belongs to no powder at all. Ask for the "best protein shake" and the answer is ready-to-drink: Fairlife Core Power, Premier Protein. That is the decoupling: there is no single most-cited protein brand — there is a winner for the broad query, a winner for the clean-label query, and a winner for the convenience query. Revenue rank predicts only the first.
"Optimum Nutrition owns the protein aisle, and it owns the default answer. But add one word — clean, transparent, no artificial — and the engine hands the question to a brand a fraction of its size. That brand won the citation by disclosing everything: full formula, third-party tests, dosing logic the model can read and repeat. In performance nutrition, transparency is not a marketing line. It is a retrieval asset — and the brands that publish the most win the queries that matter most."
5W analyzed more than 60 common consumer prompts across six primary sub-categories of the performance-nutrition market, running each prompt five times per engine in clean sessions. We identified which brands AI models consistently surface, which sources feed those citations, and how the answer changes with the qualifier in the query.
Optimum Nutrition, Dymatize, BSN, Ascent, Isopure.
Naked Nutrition, Garden of Life, Orgain, Owyn, and plant blends.
Premier Protein, Fairlife Core Power, Muscle Milk, Owyn.
C4 / Cellucor, Ghost, Ryse, BSN, Transparent Labs.
Optimum Nutrition, Transparent Labs, Legion, and monohydrate makers.
Momentous, Klean Athlete, Legion, Transparent Labs.
Query types tracked. Real-world prompts including "best protein powder," "cleanest protein powder," "best protein shake," "best pre-workout," "best creatine," "most transparent protein brand," "best protein for muscle gain," and 50+ variations covering recommendation, comparison, and clean-label intent.
Citation sources tracked. Fitness and consumer editorial, independent testing and lab-analysis content, registered-dietitian coverage, reference sources, and brand-owned content.
| # | Brand | Category | AI Visibility | Notable |
|---|---|---|---|---|
| 1 | Optimum Nutrition | Whey / multi-category | Category-dominant | Owned by Glanbia; Gold Standard Whey; the default citation for the broad "best protein powder" query. |
| 2 | Transparent Labs | Clean-label / DTC | Clean-label leader | Direct-to-consumer; full-disclosure formulas and third-party testing; owns "cleanest" and "most transparent" citations. |
| 3 | Premier Protein | Ready-to-drink | RTD co-leader | BellRing Brands; high-protein shakes with mass-retail reach; owns much of the "best protein shake" surface. |
| 4 | Ghost | Lifestyle performance | Lifestyle-brand tier | Lifestyle-driven sports-nutrition brand; collaboration marketing fuels constant earned coverage and citations. |
| 5 | Legion | Clean-label / DTC | Clean-label challenger | Direct-to-consumer; evidence-led, naturally sweetened formulas; cited heavily in clean-label comparisons. |
| 6 | Fairlife Core Power | Ready-to-drink | RTD co-leader | Fairlife, a Coca-Cola company; filtered-milk protein shakes; a fast-rising "protein shake" citation. |
| 7 | Dymatize | Whey / isolate | Performance-whey tier | BellRing Brands; ISO100 hydrolyzed isolate; cited in higher-end whey and isolate queries. |
| 8 | Muscle Milk | Ready-to-drink | Legacy-RTD tier | Owned by Hormel; a long-standing protein-shake brand; broad recognition, narrowing citation share. |
| 9 | Quest Nutrition | Bars / powder | Protein-snack tier | Owned by Simply Good Foods; best known for protein bars; cited across snack and powder queries. |
| 10 | Momentous | Clinical / NSF-tested | Clinical-grade tier | NSF Certified for Sport positioning; cited heavily in "third-party tested" and athlete-grade queries. |
| 11 | Ascent | Native whey | Native-whey tier | Native whey with a clean-ingredient story; cited by enthusiasts in higher-quality whey comparisons. |
| 12 | C4 / Cellucor | Pre-workout | Pre-workout leader | Nutrabolt; one of the most recognized pre-workout brands; anchors the pre-workout citation set. |
| 13 | BSN | Whey / pre-workout | Legacy-performance tier | Owned by Glanbia; Syntha-6 and N.O.-Xplode; legacy recognition with a thinner modern citation footprint. |
| 14 | Ryse | Pre-workout / DTC | Modern-pre-workout tier | Fast-growing DTC pre-workout brand; collaboration flavors drive social-led citations. |
| 15 | Naked Nutrition | Minimal-ingredient | Minimalist tier | Direct-to-consumer; few-ingredient protein positioning; cited in "no additives" and clean-label queries. |
| 16 | MuscleTech | Whey / performance | Legacy niche | Owned by Iovate; long-standing mass-retail performance brand; cited modestly in legacy comparisons. |
| 17 | Garden of Life | Plant-based | Plant-protein niche | Owned by Nestlé; organic plant-protein focus; cited in vegan and organic protein queries. |
| 18 | Vital Proteins | Collagen / protein | Collagen-led niche | Owned by Nestlé; collagen leader; cited in recovery, skin, and joint-support adjacency queries. |
| 19 | Orgain | Plant / organic | Organic niche | Nestlé holds a majority stake; organic protein and shakes; cited in organic and clean-label queries. |
| 20 | Owyn | Plant-based RTD | Allergen-friendly niche | Plant-based, allergen-free ready-to-drink protein; cited in vegan-shake comparisons. |
| 21 | Klean Athlete | NSF Certified for Sport | Certified-sport niche | NSF Certified for Sport line; cited in athlete-grade and banned-substance-tested queries. |
| 22 | Body Fortress | Value whey | Value niche | Value mass-retail protein; cited mainly in budget and affordability queries. |
| 23 | Six Star | Value performance | Value niche | Owned by Iovate; value performance line; cited in budget protein and creatine comparisons. |
| 24 | Isopure | Clear / isolate | Clear-protein niche | Owned by Glanbia; zero-carb and clear-protein lines; cited in lean-isolate queries. |
| 25 | Huel | Meal replacement | Adjacent niche | Direct-to-consumer; complete-nutrition and meal-replacement positioning; cited at the edge of the category. |
Three decades of recognition make Optimum Nutrition the brand the engines reach for on the broad, unqualified "best protein powder" query. Incumbency is a real citation asset — it just stops working the moment the question gets specific.
Transparent Labs publishes full formulas, dosing rationale, and third-party test results. That is exactly the structured, verifiable content AI engines retrieve and trust — and it lets a smaller brand own the "cleanest protein" query outright.
The "best protein shake" query routes to ready-to-drink, not powder. Premier Protein and Fairlife Core Power built the editorial and review record around convenience — and own a citation surface the powder brands cannot reach.
Momentous anchored itself to NSF Certified for Sport and clinical-grade positioning. "Third-party tested" is now its own query, and a brand that owns a credential owns the answer that asks for it.
Several long-recognized performance brands have no transparency or third-party-testing narrative. As clean-label queries grow, brands with nothing to disclose are absent from a rising share of the surface.
Body Fortress and Six Star surface mainly in budget queries. A brand cited only when the qualifier is "cheap" cedes recommendation and category-leadership queries to others.
Pre-workout brands that never built a protein, creatine, or recovery presence are cited only inside their original lane — and miss the broader performance-nutrition surface.
Plant-protein brands without a distinctive sourcing or sustainability story blur together. The engines retrieve the brands with a clear differentiator and skip the undifferentiated middle.
"Best protein powder" returns the incumbent. "Cleanest" or "most transparent" returns a different, smaller brand entirely.
Full formulas and third-party test results are exactly the structured content AI engines can retrieve, verify, and repeat.
The "protein shake" query routes to RTD brands, not powders. Format defines a separate answer the powder brands cannot reach.
A 30-year brand owns the broad query. It does not automatically own the clean-label, certified, or comparison queries.
"NSF Certified for Sport" and "third-party tested" are now searched directly — and the brands that hold the credential own the answer.
Lab-analysis and dietitian-reviewed content feed performance-nutrition citations disproportionately.
With the category projected to grow at a 13% annual rate, "best creatine" is a fast-expanding citation lane.
Convenience-format protein is pulling citation share toward the shake brands and away from the tub.
As "good source of protein" becomes a purchase driver across food and beverage, the citation set is widening.
Heavy-metal and label-accuracy coverage is feeding the transparency query — and the brands that disclose most.
Muscle-preservation framing for people on GLP-1 medications is opening a new performance-nutrition citation lane.
Third-party testing is shifting from a premium feature to a baseline expectation the engines surface by default.
For decades, sports nutrition was bought on brand recognition and the gym-floor recommendation. Those still matter. But a growing share of buyers now begin with a specific, qualified question typed into an AI engine: not "protein powder," but "cleanest protein powder," "best protein shake," "best third-party-tested creatine."
The Index shows what that surface rewards: structured, verifiable formula data, a credential the brand owns, a presence in the format that is rising, and a clear differentiator. It does not simply reward scale — the world's largest sports-nutrition brand owns the broad query and loses the specific ones.
AI citation share is the scoreboard. In performance nutrition, the brand AI names is the brand that answers the qualified question — and that visibility is built in disclosure and certification, not in shelf space alone.