Gold Standard Natural 100% Casein
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Optimum Nutrition

Gold Standard Natural 100% Casein

Slow Protein Digestion!*
Natural Slow Digesting, Anti Catabolic Miceller Protein!*
8.5 out of 10 (154 Reviews)

Product Overview

Rapid protein use is desirable immediately before and after exercise to help refuel recovering muscles, but delayed digestion and absorption may be more beneficial at other times - including bedtime when your body typically goes for hours without food.* Casein proteins are sensitive and tend to thicken in the stomach. Because of this, it can take more than twice as long for our Gold Standard Natural 100% Casein to be broken down into its amino acid subcomponents than other proteins.* Gold Standard Natural 100% Casein is also free of artificial flavors, sweeteners, and synthetic colors and uses only premium micellar caseins to create a protein that is truly time-released.*

Beyond The Basics

  • No Artificial Flavors, Sweeteners, or Synthetic Colors.
  • Loaded with Micellar Casein.
  • 24 grams of time-released protein per serving.*
  • Contains AMINOGEN® digestive enzymes to enhance utilization.*
  • Nearly 5 grams of BCAAs (Leucine, Isoleucine, and Valine).
  • Nearly 5 grams of Glutamine Precursors in every scoop.

Ratings & Reviews

Overall Rating
154 Ratings
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Verified Buyer

At first I didn't like it at all, I mix it with milk and it was very thick and a very strong vanilla flavor then I start mixing it with water and I could tolerate it after all it's protein and I wasn't going to waste it!!

Verified Buyer

keeps me filled up and taste great


This is a good protein to drink just before bed. As others have mentioned, the chocolate creme doesn't taste anything like chocolate. Keep with it, though, as it will grow on you. I mix mine in a shaker cup with unsweetened, plain almond milk. I add cinnamon and 1 packet of raw monk fruit (0 calories, natural...get at Target or WF), and I leave it in the fridge for the day. It won't be lumpy if you let it sit for a while. This is not one to mix and drink right away because it will have some lumps. Also can add PB2 for extra flavor. I have high metabolism and usually get hungry at night. This helps so I don't wake up starving.

Verified Buyer

I use a mix of casein and whey to mix my own blended protein shakes. While the taste of this protein is not as good as some of the others i have tried, it does not contain sucralose; which is the main reason i switched. I have a shake for breakfast and one post-workout. I blend almond milk, almond butter, protein blend I described above, oat mill, greek yogurt and fresh fruit. This serves as a meal/calorie supplement. I work out 5 days a week and run about 10-15 miles per week. Due to my high activity level, i have to increase my calorie intake to maintain my weight. This provides me with a clean protein supply that works perfect for me.

Verified Buyer

Kept me full during the night, great when mixed with a fast absorbing protein for a optimal release of protein!

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