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Optimum Nutrition 100% Casein Protein Optimum Nutrition
100% Casein Protein

8.5/10 13 reviews


Sometimes slower is better-especially when it comes to the rate of protein digestion. While rapid protein absorption is desirable immediately before or after exercise, delayed release is probably more beneficial throughout the remainder of the day. Casein proteins are pH sensitive and gel in the acidic environment of the stomach. As a result, it can take more than twice as long for caseins to be broken-down into their amino acid subcomponents than whey and other proteins. Casein is the most abundant protein present in milk. It is considered a high quality protein because it is easily assimilated and it supplies sufficient quantities of amino acids that cannot be synthesized by the body.

Another benefit is increased satiety (feeling of fullness or satisfaction). Casein exerts a slight pressure on the stomach walls. In effect, this pressure signals to the brain to stop eating because the stomach is full. Casein is the most slowly digested and absorbed type of protein. This helps create a "timed-release" effect, providing a steady stream of amino acids to your muscles over a long period of time. The net result is a greatly enhanced anti-catabolic environment which is much more friendly to growth and recovery.

Bodybuilders and athletes looking to build lean muscle, prevent muscle breakdown, and reduce recovery times, and individuals interested in improving the quality of their sleep can greatly benefit from casein.
Casein Research
Perhaps the most interesting kernel on casein to come from the scientific community is the Boirie study, which found that casein managed about a 31% increase in protein synthesis (to whey's 68%)... but also reduced whole-body protein degradation (catabolism) by 34%. More importantly, researchers found that casein contributed to a positive nitrogen balance an average of 7 hours after ingestion.

The Biorie study has since spurred further research of casein. Another study looked at the effect casein might have on body composition when used as part of a 12-week weight-training program. Participants were separated into two groups, each of which maintained a balanced diet including 75 grams of protein per day. The difference was in the sources of protein used: while the first group relied on whey-based drinks to reach their daily protein requirements, the second group made use of milk protein isolates (80% casein, 20% whey). At the end of the study, the milk protein isolate group had lost more fat (15.4 lbs. vs. 9.2 lbs.), gained more lean mass (9 lbs. vs. 4.4 lbs.), and gained more upper and lower body strength than the whey group.

Additional studies, though not as influential, have indicated casein may lower "bad" LDL cholesterol levels and increase "good" HDL cholesterol levels at the same time. In people whose immune systems were weakened by illness or disease, casein appears to demonstrate anti-viral and immune system-enhancing properties. Casein has even been linked to decreases in inflammatory factors in cardiovascular disease.

Customer Review

Product note
8.5 out of 10
0 10 Based on 13 users reviews
Detailed reviews summary
Product (8.8)
Taste (8.3)

17-09-2015 12:26:33
Casien protien has been the best thing i have tasted for the value of money. The flavour are all very nice so when i have my shake before bed it may aswell be a milkshake but with the added protien. It supplys a constant stream of amino acids to my muscles which provides me with added growth as i sleep. Also, it makes me less hungry when i wake up the next day which is good because it is fullfilling my diet need.

14-06-2015 09:52:54
Optimum Nutrition has become my go-to for all things protein powder and its 100% Casein Protein is not going to change that. It mixes well into water and milk in a standard shaker. The "Cookies and Cream" flavor mixed into a little almond milk had become a favorite in my household.
best casein protein out there. I also like strawberry flavor too. I wish i got the a 4 lb version because the 2 lb goes way too quick due to my consumption

01-04-2015 21:18:52
I have tried this product in the past in the banana flavor, this is a very high quality casein from a trusted reputable brand it stacks well with gold standard whey post workout and this post bed to provide a constant supply of amino acids to the muscles.

The texture is thicker than whey which is to be expected from a casein based product but it mixes flawlessly also the banana flavour is not overpowering or sickly like some other brands versions which makes it easy to use on a regular basis without getting sick of.

When i used to use this before sleep i noticed less DOMS the next day and also less hunger in the morning recovery was more improved.

10/10 great quality milk based casein product that is more versatile than whey and makes great protein dessert that is very filling and great as a pre bed snack.


16-03-2015 23:20:20
I don't feel the need for to spend money casein protein products, even though I have tried this product and it's brilliant, it's useful for slow digestion of orotein for recovery trough the night and it can also useful for a late night drink hit before bed or even a a quick and convenient Wayne getting in calories that you missed throughout the enitire day. As it's an ON product of course it mixes smoothly really quickly and tastes great.

17-11-2014 12:24:46
ON's 100% Casein Protein is one of the most reasonably priced casein protein supplements on the market. If you're an avid fan of their whey protein, it's worth giving this one a shot.

I'll end on a pleasant note: from time to time you may find that consuming a protein supplement will initiate the escape of foul and unpleasant odors from one of your body's orifices. If you ever suffer from this affliction, try taking another brand and/or form of protein.

Even if you're happy with the results of a particular brand/form of protein, it's probably best to rotate your supplements (just as its important to have a wide variety of foods in your diet) to keep your body from adjusting to one form of protein.

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896 - 908 grams

28 Servings
£1.02 per serving

10+ In stock

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941 100% Casein Protein, Creamy Vanilla - 908 grams

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1818 grams

59 Servings
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1278 100% Casein Protein, Creamy Vanilla - 1818 grams

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