OPTIMUM NUTRITION

Gold Standard 100% Casein Protein Powder

A micellar-casein powder, checked here in Cookies & Cream with a 924 g, 28-serving tub. The checked panel declares 24 g protein per 33 g serving, allowing comparison with a dietary protein gap rather than assuming a bedtime shake is necessary.

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Optimum Nutrition Gold Standard 100% Casein Protein Powder Cookies & Cream black tub labelled 924 g and 28 servings.
Supplements & protein

Product features.

A good fit for Comparing a milk-derived casein shake with other ways to meet daily protein needs.

  • The checked ingredients identify micellar casein as 88% of the powder and name milk among the allergens.
  • The Cookies & Cream table declares 24 g protein per 33 g serving, making the nutrient amount available for comparison.
  • The photographed tub identifies the flavour, 924 g net weight and 28 servings, distinguishing the selected pack from larger tubs.
  • Casein supplies dietary protein for normal muscle maintenance; the useful amount depends on total food intake and the training goal.
The trade-off

Contains milk and soy, plus sweeteners. Flavour-specific nutrition differs, and a slow-digesting protein does not establish an added benefit from compulsory bedtime use.

Read the ingredient evidence.

Casein protein — Casein supplies complete protein; human research does not establish universal superiority of bedtime timing. Benefits, women’s context & cautions

These findings concern the stated ingredient or studied preparation. The finished formula and retail version may differ.

Check the exact version, pack size and seller terms before buying.

The details that matter.

Checked flavour
Cookies & Cream
Photographed pack
924 g; 28 servings
Checked serving
33 g powder provides 24 g protein
Protein source
Micellar casein, 88% of the listed powder
Added minerals
94.8 mg magnesium and 2.5 mg zinc per checked 33 g serving
Sweeteners
Sucralose and acesulfame K
  • Check milk and soy allergens and the received flavour ingredients; the brand also lists possible cross-contact allergens.
  • The retailer includes older 908 g box text while the main photograph and current manufacturer table say 924 g. Confirm the pack supplied.
  • Count protein in the whole diet. A milk allergy or prescribed protein restriction requires individual assessment.
  • Use each flavour's own nutrition panel; the amounts here describe Cookies & Cream rather than every option.

Cycling & duration.

Ingredient timeframes describe the cited preparation; they do not establish a cycle for every finished formula.

Casein protein

On/off pattern
No on/off cycle is required for a protein food; use depends on the dietary gap.
Duration & evidence
There is no fixed course. A small daytime-versus-bedtime casein study followed training for 10 weeks; that was not a maximum safe-use period.
When to review
Reassess total daily protein when diet, training, body weight or a prescribed nutrition plan changes.
  • Bedtime use is optional; the comparison trial did not establish a need to reserve casein for a particular daily window.
  • A milk allergy or medically restricted protein intake changes suitability regardless of how long a supplement has been used.

Duration sources: Daytime versus nighttime casein: 10-week training study · ISSN: protein and exercise position stand. Checked 2026-11-06.

Read the guide to supplement cycling, courses and review periods

How we assessed it.

Exact Amazon UK destination, product photographs and published specifications checked on 6 November 2026. Descriptions distinguish observed label details from retailer claims and conflicts. Gram Health has not physically tested this product.

Retailer source: Amazon UK: Optimum Nutrition Gold Standard Casein, Cookies & Cream · Details checked 2026-11-06.

Optimum Nutrition UK: Cookies & Cream 924 g casein table

ISSN: dietary protein and exercise context

These features explain the choice; individual fit, taste and health suitability can differ. Current stock, price and seller terms belong to the specific listing.

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