Promix vs Naked Nutrition
Two of the cleanest grass-fed whey brands in America, both priced at a premium, both built around small-farm sourcing. We pit Promix Original Whey against Naked Whey to find out which one is actually the better buy.
Overview: Promix Nutrition
Promix launched in 2011 from a Pennsylvania kitchen with a focus on small-farm grass-fed dairy sourcing. The brand's founder, Albert Matheny, is a registered dietitian and SoHo Strength Lab co-founder, which gave Promix early credibility with the New York fitness audience. Promix Original Whey uses whey concentrate from cows raised on small American family farms (Pennsylvania, Wisconsin, Midwest), sweetened with organic cane sugar or stevia depending on flavor, with no artificial colors or fillers.
We currently track four Promix SKUs: Original Whey (chocolate, vanilla, cinnamon bun, iced coffee), Whey Isolate, Casein, and a plant blend. Pricing runs about $59.99 for a 2.5 lb bag of Original Whey at standard prices, or about $54.99 on subscribe-and-save. Promix sells direct through promixnutrition.com plus a limited Amazon presence.
Overview: Naked Nutrition
Naked Nutrition is the originator of the modern single-ingredient whey movement. Naked Whey contains literally one ingredient: whey protein concentrate from grass-fed cows on small California dairy farms. No artificial sweeteners, no flavors, no soy lecithin, no acid or bleach processing. Flavored versions add only organic cocoa or organic vanilla plus organic coconut sugar. The brand publishes per-batch lab tests on its site for total transparency.
We track seven Naked SKUs spanning Naked Whey (Unflavored, Chocolate, Vanilla), Naked Casein, Naked Mass, Naked Vegan, and Naked Whey Isolate. Pricing runs about $89.99 for a 5 lb tub of Unflavored Whey at standard prices, or about $79.99 on subscribe-and-save. Naked sells primarily direct through nakednutrition.com plus selected Amazon stock.
Head-to-head comparison
| Metric | Promix Original Whey (2.5 lb) | Naked Whey (5 lb) |
|---|---|---|
| Tub size | 1,135 g / 2.5 lb | 2,270 g / 5 lb |
| Servings per tub | 32 | 75 |
| Protein per serving | 26 g | 25 g |
| Total protein per tub | 832 g | 1,875 g |
| Lowest tracked price | $54.99 (subscribe) | $79.99 (subscribe) |
| Cost per serving | $1.72 | $1.07 |
| Cost per gram of protein | $0.066 | $0.043 |
| Sweeteners (flavored) | Organic cane sugar or stevia | Organic coconut sugar |
| Artificial flavors | None | None |
| Per-batch testing | Yes, third-party | Yes, third-party |
| Flavor count | 4 (Chocolate, Vanilla, Cinnamon Bun, Iced Coffee) | 3 (Unflavored, Chocolate, Vanilla) |
| Sourcing | Small US family farms | California small-dairy co-ops |
| Retailer reach | promixnutrition.com, Amazon (limited) | nakednutrition.com, Amazon (limited) |
Value Score breakdown
This is closer than the headline pricing suggests, but Naked still pulls ahead at the bulk-size level. The 5 lb Naked tub costs less per gram of protein than the 2.5 lb Promix bag, simply because of the size advantage. If you compare like-for-like sizes (Promix 5 lb when available vs Naked 5 lb), the gap closes to single-digit percentage points.
Both brands run subscribe-and-save discounts (10 to 15%) that lock in lower pricing. Both also do major-holiday promos (Black Friday, Memorial Day) that drop prices another 15 to 25%. If you can time a Naked Black Friday purchase, the 5 lb tub will land around $69.99 and the per-gram math becomes hard to beat in the grass-fed tier.
For more context on grass-fed whey pricing, see our Best Grass-Fed Whey 2026 guide.
Flavor and mixability
Promix Chocolate is one of the standout grass-fed chocolate flavors on the market. It uses Dutch-processed cocoa plus organic cane sugar to land closer to a "real chocolate milk" flavor than the slightly muted Naked Whey Chocolate. Vanilla is similarly rich, and the Cinnamon Bun and Iced Coffee SKUs are widely praised for tasting like real coffee shop drinks rather than chemical approximations.
Naked Whey flavors lean intentionally lighter on sweetness. Chocolate is more "70% cacao dark chocolate" than "milk chocolate." Vanilla is a true Madagascar vanilla bean flavor, slightly grainy from real bean specks. Unflavored is essentially neutral milk taste with faint sweetness from the whey itself. Mixability is good in both brands; neither clumps or foams excessively.
Verdict by goal
Which one should you buy?
If you want the most enjoyable daily drinking experience and you want to support a small US family-farm sourcing model, buy Promix Original Whey. Chocolate is the unanimous top pick. Subscribe-and-save brings the 2.5 lb bag to $54.99, which works out to about $50 per month for one shake per day.
If you want the cleanest possible label, the best per-gram value among grass-fed brands, and a neutral base you can use for cooking and baking, buy Naked Whey. The Unflavored 5 lb tub at $79.99 on subscribe is the most versatile premium whey we track, and the Chocolate version is a fine daily option if you tolerate lower sweetness.
If you cannot decide: buy Naked Whey Unflavored for cooking and Promix Chocolate for shakes. Total cost on subscribe: about $135 for a combined three-month supply. You cover both use cases without compromise.
Common questions about Promix vs Naked
Are both brands actually small-farm sourced?
Yes. Promix uses a network of family farms in Pennsylvania, Wisconsin, and the Midwest, mostly under 200 head per farm. Naked uses California small-dairy co-ops with similar herd sizes. Both publish supplier sketches on their websites. Neither is "industrial dairy" sourcing. This is one of the cleanest sourcing stories you can find in the US whey market.
How do they compare to Transparent Labs?
Transparent Labs Whey Protein Isolate uses 100% grass-fed New Zealand sourcing (Westland Milk Products), which is generally considered the gold standard for grass-fed certification. Promix and Naked use US grass-fed standards, which allow more supplemental feed in winter months. All three are well-regarded clean-label brands. Transparent Labs is more "premium isolate." Promix and Naked are more "minimalist concentrate." Different products, similar quality tier.
Does Promix really not use any artificial sweeteners?
Correct. Promix uses organic cane sugar in most flavored versions (Chocolate, Vanilla, Iced Coffee, Cinnamon Bun) and stevia in select stevia-sweetened variants. No sucralose, no aspartame, no acesulfame potassium. That keeps the carb count slightly higher than competitors (around 6 to 8 g carbs per scoop versus 2 to 3 g for sucralose-sweetened whey) but matches the brand's whole-food positioning.
Which one ships faster?
Both ship from US warehouses (Promix from Pennsylvania, Naked from East Coast and California fulfillment centers). Standard delivery is 3 to 5 business days. Naked offers free shipping over $99. Promix offers free shipping over $79. Subscribe-and-save customers get expedited handling at both brands. Neither is Prime-fast.
Do these brands taste better than mainstream whey?
Different, not necessarily better. Optimum Nutrition Gold Standard and Dymatize ISO100 have 30 years of flavor R&D and use sucralose for high-intensity sweetness. Promix and Naked use organic sugar at lower intensity, resulting in a less sweet, more "milk-and-cocoa" flavor profile. If you grew up on Gold Standard, your first scoop of Naked or Promix may feel underwhelming. Most clean-label converts adapt within a week and prefer the lower-sweetness profile long-term.
Are these whey products safe for daily use?
Yes, assuming no dairy allergy or lactose intolerance. Both brands publish lab tests for heavy metals, microbial contamination and protein content per batch. Both are Informed Choice or NSF tested. Neither contains banned substances or undisclosed ingredients. Combined with adequate protein intake (1.6 to 2.2 g per kg bodyweight per day), one to two scoops daily is well within mainstream dietary guidance.