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  • 24 Grams of Casein Protein per Serving to Help Build and Maintain Muscle
  • Nearly 5 Grams of Naturally Occurring BCAAs per Serving to Support Endurance and Recovery
  • Ideal for Use Between Meals and Before Bed

Product Overview


Casein, a slower digesting and absorbing protein can be used after exercise, between meals or before bed to help support satiety and muscle recovery. GOLD STANDARD 100% CASEIN™ delivers BCAAs to recovering muscles for several hours. By using only premium micellar casein as a protein source, we’ve created a protein powder that sets the GOLD STANDARD® for slow digesting protein support.




  • 24 Grams of Casein Protein per Serving to Help Build and Maintain Muscle

  • 100% of the protein from Micellar Casein, slow digesting for round the clock protein coverage
  • Nearly 5 Grams of Naturally Occurring BCAAs per Serving to Support Endurance and Recovery
  • Low levels of sugar (1 gram) and fat (0.5-1 gram) and less than 120 calories
  • Available in a range of different serving sizes and flavours Informed-choice certified product

Suggested Use

Casein is best enjoyed in the evening. Enjoy before bed to support muscle growth & repair while you rest or have it between meals as an anytime snack in your balanced diet. Mix 1 rounded scoop in 300-360 ml of cold water or milk using a shaker cup and stir, shake or blend for 30 seconds or until dissolved. For healthy adults, consume enough protein to meet your daily protein requirements with a combination of high protein foods and protein supplementation throughout the day as part of a balanced, diet and exercise program.

Nutritional Information

Nutritional information will be shown when a flavour and/or size is selected.

Customer Reviews

Overall Rating (4.8)
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Been using this as my regular Casein for five years

Review by Clint on Oct 29, 2023
Verified purchase
So I'm an old, broke down man. Early forties, never had a taste of the HRT, but I still OHP for reps in the low 2's, bench for reps in the low 3's, squat for reps in the low 4's and deadlift for reps in the low 5's. I've been using ON Casein for half a decade now as my pre-bedtime protein dose (it's fine for a shake, but I make a pudding). Now give me my 5% discount.

Great for cooking

Review by Peter Bushnell on Oct 21, 2023
Verified purchase
If you want the best protein pancakes you need to use ON Casein. Generally cooking and baking works best with casein with a few exceptions. Will always buy Optimum Nutrition as it is the market leader and offers the highest quality. It is the difference between buying best product or the supermarket own brand.

Best flavour so far

Review by Natasha N. Kuhnke on Oct 19, 2023
Verified purchase
Love the chocolate flavour that almost has like a hint of coffee/caramel taste. I take whey in the am and casein in the pm before bed for slow overnight recovery. Love it and will stick to it.


Review by Scott Gebert on Oct 9, 2023
Verified purchase
Great product, love the flavor. Perfect protein drink after an early evening workout just before going to bed. Feeds the muscles while sleeping and aids in quicker recovery time. I will be ordering this product again soon.


Review by Leovy Ancheta on Oct 6, 2023
Verified purchase
Best casein ever!

Good taste

Review by Robert Bourland on Oct 1, 2023
Verified purchase
Easy to drink and good taste.


Review by T on Sept 30, 2023
Verified purchase
Best protein product I’ve used. Mixes really well in porridge and if you add around 150ml of water it makes a protein pudding. Should be advertised more.


Review by Anonymous on Sept 7, 2023
Verified purchase
Response and updates through order process was great.

Great taste

Review by Anonymous on Sept 7, 2023
Verified purchase
The chocolate tastes great and after taking this casien my body changes a lot.

Love this Protein Powder!

Review by Matthew on Aug 29, 2023
Verified purchase
I use the Chocolate Supreme and Creamy Vanilla in drinks and in my home made protein muffins. It taste great and mixes well in the drinks and the muffin mix. It's a great product!