Optimum Nutrition Gold Standard Casein 4lb

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Optimum Nutrition's Gold Standard Casein was the industry's first all-micellar casein protein and it's been America's best-selling casein for many years. 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.  Micellar Casein is the slowest digesting form of casein.  It is separated from milk through an ultrafiltration process.  


  • 24 grams of micellar casein instantised blend of slow digesting casein-based proteins
  • Support muscle growth and anti-catabolic effect prevents muscle wasting
  • Perfect slow release and slow digesting protein formula
  • Muscle building and fast recovery
Shipping Information

Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.

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