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Gold Standard 100% Casein

  • 24 grams of high quality slow digesting micellar casein
  • Slowly digested casein for round the clock protein coverage
  • Low in sugars and fat

Product Overview

REPAIR WITH GOLD STANDARD 100% CASEIN™ Support Muscle Growth & Repair Overnight

Gold Standard 100% Casein™ is a slow digesting protein that supports muscle growth and repair while you sleep. Each serving is packed with 24g of protein which provides a prolonged supply of amino acids overnight. SUPPORT MUSCLE GROWTH AND REPAIR OVERNIGHT. From runners to rugby players and tennis players to triathletes, whenever any type of athlete trains or competes their muscles need preparing and repairing to put them in the best shape next time out.

Casein is best enjoyed in the evening.Enjoy before bed to support muscle growth while you rest. Suitable for vegetarians.


Ready to mix casein protein powder with sweeteners. Suitable for vegetarians.


  • 24 grams of Pure Micellar Casein with 0.5 g of fat and no added sugars

  • Slowly digested casein for round the clock protein coverage

  • Protein Supports Muscle Growth and Maintenance

  • Enjoy before bed to support muscle growth while you rest

Suggested Use

Mix 1 rounded scoop in 300-360 ml of cold water. You can also add a serving to smoothies, protein balls, muffins, porridge or other meals as another great way to get a protein hit in the kitchen.

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 Jun 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.