Every Optimum Nutrition product ranked by value across 12 US retailers: from the iconic Gold Standard 100% Whey to Gold Standard Casein and Hydro Whey. Checked daily.
Founded in 1986 by brothers Mike and Tom Costello in Downers Grove, Illinois, Optimum Nutrition (ON) has spent nearly four decades building what is, by almost any measure, the most-recognised sports nutrition brand in the world. Gold Standard 100% Whey: first launched in the late 1990s: sits in more home pantries and gym lockers than any other protein powder on the planet.
ON's philosophy has always been quality consistency at scale. Each tub is a blend of whey isolate (listed first), concentrate and peptides: a formulation that's been refined, but never radically changed, since launch. That stability is exactly why nutritionists, coaches and beginners keep recommending it: you know what you're getting, batch after batch.
Beyond Gold Standard Whey, ON's flagship lineup includes Gold Standard 100% Casein for slow-release night-time protein, Hydro Whey for premium fast-absorbing hydrolysed isolate, and Pro Gainer for serious bulkers. We track them all: and rank them strictly by what they deliver per dollar.
Across our tracked Optimum Nutrition catalog, the lowest prices show up most frequently at -, with - a close second. Amazon and iHerb tend to lead on the 5lb tubs, while Walmart often wins on Gold Standard Whey 2lb.