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Gold Standard 100% Whey (908g) + Whipped Protein Bar (box) now only for £39.99!  31% savings!

Gold Standard 100% Casein

  • For overnight muscle support & repair
  • 24 g of premium whey protein per serving
  • Now fortified with Zinc & Magnesium
From £34.99

Product Overview

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

GOLD STANDARD 100% CASEIN™ is a slow digesting protein that supports muscle growth and repair while you sleep. Each serving is packed with 24 g of protein which provides a prolonged supply of amino acids overnight.

Our latest formula is now fortified with zinc which contributes to a healthy immune system and magnesium to support normal protein synthesis.


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


  • 24 g of casein protein with low levels of sugar and fat and less than 120 calories

  • Slow digesting casein for round the clock protein coverage
  • 10g of naturally occurring EAAs in each serving
  • Now fortified with zinc and magnesium
  • 100% of the protein from Micellar Casein
  • Available in a range of different serving sizes and flavours
  • Infomed-choice certified product

Suggested Use

Casein is best enjoyed in the evening. Enjoy before bed to support muscle growth & repair while you rest. Mix 1 rounded scoop in 300-360 ml of cold water.

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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A great product

Review by Steve Seeling on Oct 4, 2021
It’s hard to find a good protein powder that all tastes good. This has it all! It’s exactly what I need.

Really nice

Review by Seb on Sep 12, 2021
Very good product, 100% recomend and the flavor (strawberrry in my case) is tasty !

Super tasty

Review by Phil on Sep 5, 2021
Tastiest protein I have tried, has really helped to ensure my body fully recovers between workouts. Means I can push stronger for longer!

Love this product!

Review by Rebecca Atkin on Sep 4, 2021
Works great! It has made all the difference in our workouts!

Too dense and doesnt mix well

Review by Manish on Aug 27, 2021
Does not mix nicely at all. I use a spoon to mix it with a glass of water. Of all the ON, product i have tries this one is the most difficult for me to swallow and mix.


Review by Marcelo on Aug 26, 2021
Good flavour and excellent quality. I totally recommend!

Will buy again

Review by Anonymous on Aug 24, 2021
I got the Cookies and Cream flavour. Tastes good and mixes well, forming a rich shake without being too gloopy or chalky. I'd recommend adding a fair amount of water to make sure you get a consistency that works for you, probably 300+ml; casein likes to form a gel when suspended in liquid (good micellar casein is supposed to do this). Also quite filling!

Excellent taste and consistency

Review by Fawad Karim on Jul 31, 2021
I use ON Casein daily as directed. Great texture and always dissolves completely in about 250ml of water. I really like the taste and its properties of slow release of protein overnight. Great for me as an endurance runner who just can’t get enough protein during the day from meals and whey protein supplements.

Fantastic overnight Protein

Review by Gary Gorman on Jul 29, 2021
I use this product every night to get that constant feed of slow release protein. Absolute game changer and tastes amazing

A bit sweet for my tastes, but otherwise excellent

Review by Anonymous on Jul 20, 2021
I found the "Creamy Vanilla" flavor to be a bit more "white sheet cake" flavored than a true vanilla, and quite a bit sweeter than I would have liked. But otherwise it performs as exactly promised: Mixes quickly and thoroughly, creates a nice rich shake without being chalky, grainy, or unctuous, and the casein keeps you satiated for a decent amount of time. I like to blend mine with frozen fruit or berries for a nice summer smoothie, which is why the vaguely cheap-grocery-store-cake flavor overtones were somewhat disappointing. It's not horrible, especially considering some of the other shake brands I've tried. But as someone who is perpetually on the hunt for a minimally-sweet and more real vanilla tasting protein smoothie base, I likely won't buy this particular flavor again, and I really wish they offered an unflavored option in the casein version.

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