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Optimum Nutrition Gold Standard 100% Casein

Optimum Nutrition Gold Standard 100% Casein

Slow-digesting bedtime protein from the Gold Standard line.

Protein
24 g
Carbs
3 g
Type
Micellar casein

Per serving, from the label. Formulas can change — always check the package.

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Why it's on our list

Casein digests slowly, which is why lifters take it before bed or between long gaps in meals. Optimum Nutrition's version is the classic: 24 g of micellar casein and 3 g of carbs per scoop, with the same flavor quality as its famous whey.

  • Micellar casein — thick, slow-release protein
  • Flavors: Creamy Vanilla, Chocolate Supreme, Cookies & Cream, Chocolate Creme
  • Popular before bed or mixed into a pudding-style shake

Best for

Questions people ask

How much protein is in one scoop of Optimum Nutrition Gold Standard 100% Casein?

The number on this page comes from the Supplement Facts panel: protein per serving as printed on the label. Scoop sizes differ between brands (roughly 30–40 g of powder), so compare protein per serving and servings per container, not scoop counts.

Does protein powder expire?

Yes — every tub carries a best-by date, usually 12–24 months from manufacture. Powder keeps best sealed, dry and cool; once opened, use it within a few months and keep the scoop dry. Clumping or an off smell means it's past its best.

Whey isolate vs concentrate: what's the difference on the label?

Isolate is filtered further, so per serving it typically shows more protein and less lactose, fat and carbs than concentrate — at a higher price per serving. The label tells you which one you're buying; many popular powders are blends of both.

Protein powder or a protein bar?

Powder usually gives more protein per dollar and per calorie; bars win on convenience. Check the same two numbers on both: protein per serving and calories per serving.

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