Gold Standard 100% Casein
Optimum Nutrition Gold Standard 100% Casein is a casein protein powder with 24 g of protein per 34g (About 1 Scoop). It scores 63/100 on the TBPP Quality Score. We found no third-party testing certification.
Nutrition per serving
Chocolate Supreme flavor, from the label.
| Serving size | 34g (About 1 Scoop) |
|---|---|
| Protein | 24 g |
| Calories | 120 |
| Carbohydrates | 4 g |
| Sugar | 1 g |
| Fat | 1 g |
| Sodium | 260 mg |
| Protein by weight | 71% |
| Leucine | Not verified |
| BCAAs | Not verified |
How it scored
63 of 100 points. How we score
| Criterion | Points | Why |
|---|---|---|
| Protein density | 22 / 30 | 71% of each scoop is protein |
| Third-party testing | 0 / 25 | No verified independent testing program |
| Label transparency | 20 / 20 | Fully disclosed formula, no amino spiking |
| Sugar | 10 / 10 | 1 g sugar per serving |
| Ingredient simplicity | 6 / 10 | Mix of natural and artificial flavors or sweeteners |
| Verified label data | 5 / 5 | 7 of 7 label values verified |
Formula and label
| Type | Casein |
|---|---|
| Protein sources | Micellar Casein |
| Third-party testing | None found |
| Sweeteners | Acesulfame Potassium, Sucralose |
| Proprietary blend | No |
| Added free amino acids | No |
| Dietary | None listed |
| Allergens | Milk, Soy |
| Made by | Optimum Nutrition (Glanbia) · USA |
| Sold at | Optimum Nutrition (official store) |
Price
$57.49–$97.49 for 4 lb. About $1.08 per serving, or $1.13 per 25 g of protein.
Sizes: 2 lb, 4 lb
Flavors (4)
- Chocolate Supreme
- Creamy Vanilla
- Cookies & Cream
- Chocolate Peanut Butter
Sources
- https://www.optimumnutrition.com/en-us/products/gold-standard-100-casein-protein-powder
- https://www.optimumnutrition.com/en-us/products/gold-standard-100-casein-protein-powder.js
- https://www.optimumnutrition.com/cdn/shop/files/US_GS_Casein_4lb_Chocolate_NFP.jpg
Nutrition and ingredients from the brand's US Chocolate Supreme 4 lb label image (34 g serving, 53 servings); label also lists magnesium 85 mg and zinc 11 mg (added as magnesium oxide and zinc sulfate), and brand states 9 g naturally occurring EAAs. BCAA and leucine not stated by brand. Brand page says 'Banned substance tested' without naming a program, so no certification listed. Prices are brand-store list prices on 2026-10-13. Other retailers not verified in this pass.
Good to know
Last checked 2026-10-13. Labels change, so check the package before buying if you have allergies. If you are pregnant, nursing or buying for a child, ask your doctor before adding a supplement.