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Optimum Nutrition 100% Casein Protein

Optimum Nutrition 100% Casein Protein

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Optimum Nutrition 100% Casein Protein

Instantised Blend of Slow-Digesting Casein Proteins
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Today Only $99.99 Regular Price $149.95
or 6 x $16.67
or 4 x $25.00
Nutritional information
Nutritional Information

Product Information

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.


  • 24 g Instantized Blend of SLOW-DIGESTING CASEIN-Based Proteins
  • Rich in Highly Anti-Catabolic MICELLAR CASEIN
  • Over 9 g of BCAAs, Glutamine, and Glutamine Precursors per Scoop
  • AMINOGEN Enhanced



Use ON 100% Casein Protein first thing in the morning, immediately before bed, in place of small meals, and/or any other time when delayed protein absorption is desired. To encourage a positive nitrogen balance, consume approximately 1 gram of protein per pound of body weight per day from a combination of high protein foods and supplements. For even better results, consume your daily protein allotment over several small meals spread evenly throughout the day.


Container: 2 Lbs.
One Serving: 1 Heaping Scoop
Servings Per Container: 29

Delivery & Returns
Standard Shipping

Standard shipping (Monday to Friday excluding public holidays) is a flat rate of $1.99.

Approximate delivery times once your parcel has been dispatched are as follows*:

Auckland - 2 business days
North Island - 2-3 business days
South Island - 2-3 business days

Rural deliveries can sometimes take an extra few days.

*During sale and holiday periods dispatch and delivery may take longer with larger volumes of orders. No deliveries on weekends and public holidays.

Evening Express Auckalnd (Pace) - $11.50

Order before 3pm Monday to Friday (excluding public holidays) and your order will be delivered between 6-9pm that evening. This shipping option will only be displayed for valid Auckland addresses at check-out. 

If ordering on the weekend, your parcel will be shipped the next business day for delivery that evening. If there is no one home to sign for the parcel or it can't be left in a safe place, your pacel will via transferred to the depot for standard NZ Post delivery.


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