Skip to content

Free shipping orders > $99

Optimum 100% CASEIN PROTEIN, 4lb

5 reviews


Flavour: Chocolate Peanut Butter
Sale price$84.95


100% Casein Protein 4lb

Time Release to Support Muscle Growth at Bed-Time and Beyond!

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. Because of their unique time-released qualities, caseins are aptly described as anti-catabolic or muscle-protecting proteins.

*Ingredients my vary slightly per flavor.


The products and the claims made about specific products on or through this site have not been evaluated by or the Canadian Food Inspection Agency (CFIA) and the Department of Health Canada (Health Canada) and are not approved to diagnose, treat, cure or prevent disease. The information provided on this site or any information contained on or in any product label or packaging is for informational purposes only and is not intended as a substitute for advice from your physician or other health care professional. You should consult with a healthcare professional before starting any diet, exercise or supplementation program, before taking any medication, or if you have or suspect you might have a health problem. is not responsible for any statements or claims that various manufacturers make about their products or the general information provided for each product on this website. We cannot be held responsible for typographical errors, product formulation or label changes. Please consult with your own physician or health care practitioner regarding the suggestions and recommendations made on and especially before using any product sold on this website.

Payment & Security

American Express Mastercard PayPal Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

You may also like

Recently viewed

Customer Reviews
5.0 Based on 5 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Dale S.
Great product and great price

This stuff is hard to find now. But not with you. Thank for coming through

Kaitlin C.
Canada Canada

Love it

Ron C.
Canada Canada

Good love using this before bedtime

Steven S.
Canada Canada
Great tasting

Chocolate peanut butter was really good! Such an underrated flavor !

Mike N.
Ottawa, ON
Excellent quality casein

I've tried the extremely expensive ON Platinum Tri-Celle Casein before. After finishing a tub of this cheaper one in their lineup, I've found that in real world results there's no practical difference. Save your cash and go with this one! The taste is pretty good, and the consistency is tolerable/not too thick (like a lot of casein products out there unfortunately). If you'd prefer a natural version with no artificial sweeteners then Optimum has one of those out there too (not available on Supplement Source though), but be warned it mixes up VERY thick.

Free shipping on orders over $99*

Not only do we offer Canada's best supplements for less, we also have teamed up with Canada Post, Purolator and UPS to offer you the best shipping rates.  You know we love you! Click for more details. Blog

Want to know the latest gossip in the industry?  How about the scoop on that new ingredient to hit the market?  Maybe a new diet-friendly recipe?  Check out our blog for all the latest!

Questions? We are here to help.

Need a quick answer about our products or services? Shoot us an email at

100% Secure Payments

Visa, Mastercard, Amex, PayPal, E-transfer 

Your trust is our #1 priority.