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Gold Standard 100% Casein

  • 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.

Overall Rating (4.8)
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Review by Anonymous on June 1, 2024
Verified purchase
First time being Caeain powder and instantly loved it and how it works. Definitely recommend

perfect protein recovery

Review by Adam on May 20, 2024
Verified purchase
This is an amazing product, the chocolate flavour tastes so great and smooth. On workout days I always drink this protein shake before bed and it helps me recover faster for my next workout.

Build muscle

Review by A on May 20, 2024
Verified purchase
Fantastic product that helps me get those extra and most important protein calories drip fed into my muscles over night.

AAA Product

Review by Jobo on Apr 30, 2024
Verified purchase
Excellent product and service!

Late night protein kick

Review by Dan on Apr 24, 2024
Verified purchase
Taste is nice enough, though it needs a really good mix; more so than normal whey. I've definitely noticed the benefit since using it though. An easy win for getting extra protein in

The best

Review by Yusup Orazgylyjov on Apr 21, 2024
Verified purchase
Like always I was using your product, and this time I bought directly from your site and I can say that you are best!!!

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.