Optimum Nutrition

Gold Standard 100% Casein

Optimum Nutrition Gold Standard 100% Casein

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Overall

#154 in

Protein Powder

according to Reddit Icon Reddit

Sentiment score77% positive
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Last updated: Jun 29, 2026

Reddit Reviews

Reddit IconaBlueCreature
4 months ago

The cookies and cream flavoured casein protein from Optimum Nutrition tastes heavenly, like a creamy oreo shake. The whey version tastes terrible though

Reddit Iconastronaute1337
10 months ago

Casein protein works better than whey in creami. I use optimum nutrition

Reddit IconGhazrin
11 months ago

Me too. I've been using their Whey and Casein protein powders for years.

Reddit IconMatej_SI
4 months ago

I'm using Optimum Nutrition Casein with 3.5% milk instead of dinner. It tastes good. But it's expensive as fsck.

Reddit IconOxbridgeDingoBaby
5 months ago

Another vote for ON here - their Casein Chocolate Supreme in particular is absolutely the best powder I’ve used in the Creami, as it always results in super soft and creamy ice cream.

5 months ago

I’d disagree on Casein. I use Optimum Nutrition for both my whey and casein and the latter made so much creamier and softer ice cream than just whey (even with xanthan gum added). Both are chocolate flavoured, but the casein is chocolate “supreme”, so maybe that’s what made the taste difference.

5 months ago

Yes that’s the one mate. I make it with ON Casein (Chocolate Supreme) and my creami’s come out so good. I’m getting a bit tired of chocolate after a month of daily chocolate creami’s, so will be switching to the vanilla flavoured ON Casein once I’m finished with my current tub.

Reddit Iconpizzaparty_bonus
4 months ago

I thought they served different purposes; whey has faster absorption which makes it ideal for post workouts and casein has slower absorption making it ideal for adding protein to shakes or meeting your daily protein goals on certain days when you can’t get it though diet. I use both: Optimum Nutrition Chocolate Supreme (casein) for my breakfast smoothie and pre bed water-based shake Optimum Nutrition Vanilla Birthday Cake (whey) for post workouts

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