Optimum Nutrition Gold Standard 100% Casein
Slow-digesting micellar casein — 24g protein for overnight muscle support.
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Nutrition Facts
Nutrition Facts
Amino Acid Profile
Key Details
Pros
- Slow-release micellar casein — ideal before bed
- From the most trusted brand in protein
- Informed Choice certified, banned-substance tested
- 53 servings per 4 lb tub at a fair price
Cons
- Thicker, puddinglike texture is not for everyone
- Contains sucralose and artificial flavors
- Lower leucine per serving than fast whey isolates
AI Analysis
Gold Standard 100% Casein fills the slot most protein users never think about: the hours when you are not eating. Micellar casein clots in the stomach and releases amino acids for up to seven hours, which makes it the textbook choice before bed or between widely spaced meals. Optimum Nutrition pairs that slow-release profile with the same manufacturing reputation that made Gold Standard Whey the best-selling protein in the world.
Each serving delivers 24g of pure micellar casein with 120 calories and minimal fat and carbs. The 4 lb tub holds 53 servings at roughly $1.19 each — reasonable for a certified, single-source casein. Informed Choice certification means batches are screened for banned substances, a feature casein competitors frequently skip.
Be aware that casein drinks thick: mixed with the standard amount of liquid it lands closer to a light pudding than a whey shake, and the Chocolate Supreme flavor leans sweet thanks to sucralose and artificial flavoring. As a primary daytime protein a whey or blend is more versatile, but as a nighttime muscle-support protein this remains the category benchmark.
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