Are both Promix and Transparent Labs actually grass-fed?

Yes. Both brands source their whey from grass-fed cows in family-run dairy operations. Promix sources from small American family farms in Pennsylvania and the Midwest. Transparent Labs sources from grass-fed Irish dairy. Both brands disclose their sourcing publicly and publish third-party Certificates of Analysis. If grass-fed sourcing is a hard requirement, either brand qualifies.

Which has cleaner ingredients?

Transparent Labs has the edge on label minimalism. The 100% Grass-Fed Whey contains five ingredients: grass-fed whey isolate, cocoa, stevia, sea salt and natural flavor. Promix Grass-Fed Whey Isolate uses six ingredients including monk fruit and stevia. Both avoid artificial sweeteners, artificial colors and proprietary blends. The difference is marginal but Transparent Labs publishes more aggressive testing data.

Which is cheaper per gram of protein?

Promix is cheaper. Promix Grass-Fed Whey Isolate 5 lb at $89.99 works out to $0.048 per gram of protein. Transparent Labs 100% Grass-Fed Whey 2.5 lb at $59.99 works out to $0.070 per gram of protein. The 5 lb bulk advantage gives Promix a clear win on per-gram math. Transparent Labs is positioned at a premium price tier even within the grass-fed segment.

Is Transparent Labs actually transparent about sourcing?

Yes. Transparent Labs publishes detailed third-party lab Certificates of Analysis for every product batch on transparentlabs.com. The brand also discloses the specific cow-source country (Ireland), the milk-collection process, and the manufacturing facility location (Utah). The brand name was a marketing claim that has held up under scrutiny for over a decade.

Where can I buy these brands?

Both brands sell primarily through their own direct sites. Promix is on promixnutrition.com plus Amazon and limited iHerb listings. Transparent Labs is exclusively on transparentlabs.com with no Amazon retail presence (this is intentional, to maintain price control and direct customer relationships). If you want subscribe-and-save deals, both brands offer 15-25% off for recurring monthly orders.

Promix has the slight flavor edge. The Dutch Chocolate and Vanilla Bean variants are mainstream-shake palatable, sweetened with stevia and monk fruit but balanced enough that you can drink them daily. Transparent Labs Mint Chocolate Chip is a standout flavor that no other clean-label brand matches well, but the standard Chocolate and Vanilla can taste 'cleaner' (less sweet, more whey-forward) in a way that takes some adjustment. If you prefer dessert-shake taste, go Promix. If you prefer minimal sweetness, go Transparent Labs.

Promix vs Transparent Labs 2026: Premium Grass-Fed Whey Compared

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