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Optimum Nutrition
Gold Standard 100% Casein
Our analysis — editorial take, not from the label
The most widely available micellar casein: 24 g slow-digesting protein per 34 g scoop, thicker in water than whey by design, at a noticeably higher cost per serving.
- Protein
- 24 g
- Protein by weight
- 71%
- Source
- casein
- Servings
- 53
Price tier: Premium · relative cost per full serving across this database
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Figures verified against Creamy Vanilla (34 g scoop, 4 lb tub); four flavors, all sweetened with sucralose.
Label verified: July 2026 · View label source
Label data
Per full serving · 53 servings per container · from the manufacturer's panel
| Protein per serving | 24 g |
|---|---|
| Serving size | 34 g |
| Protein per scoop | 71% |
| Calories | 120 |
| Total carbohydrate | 4 g |
| Total fat | 1 g |
| Source | casein |
| Sweetener | sucralose |
| Micellar casein | 24 g |
| Naturally occurring BCAAs | ≈5 g |
| Aminogen (labeled digestive enzyme) | amount not stated on label |
| Proprietary blend | No |
Primary label source: Optimum Nutrition product page · verified July 2026
Cautions
- Contains milk — not suitable for dairy allergy
- Ingredient list includes a gum blend (cellulose, xanthan, carrageenan) and sucralose — check the label if you're sensitive to either
- Protein powders supplement food, not replace it
Formulated for healthy adults — not intended for anyone under 18. Full health & safety notes
Product details
Where this label sits
Optimum Nutrition Gold Standard 100% Casein is one of the protein powders in the Scoop Sense database. It runs 53 servings per container at the full labeled serving. Everything on this page comes from the manufacturer's supplement facts panel as of July 2026 — never from the marketing page.
Key ingredients & studied doses
- Micellar casein · 24 g. A slow-digesting milk protein studied for a prolonged amino-acid release, which is why it is commonly used between meals or before bed.
- Naturally occurring BCAAs · ≈5 g. Label states nearly 5 g per serving, supplied by the casein itself.
- Aminogen (labeled digestive enzyme) · amount not stated on label. A protease enzyme added to assist normal protein digestion.
Flavors & sweetener
Figures verified against Creamy Vanilla (34 g scoop, 4 lb tub); four flavors, all sweetened with sucralose.
Who it's best for
A standard-ratio powder — fine as a food supplement when total daily protein is what matters. Derived from the label figures above — not medical advice.
How we log this label
Every entry is built the same way: we read the current supplement facts panel, log each disclosed dose, compare it against the amounts used in published research, flag proprietary blends, and state the cautions plainly. The full methodology explains each step.
This label against the research
How we evaluate labelsEach bar shows the amount commonly used in published human research, and where this label's dose falls against it. Research amounts are context, not a recommendation — they are not doses, and nothing here is medical advice.
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Protein24 g
At or above the studied amount0studied range 20 g–40 g50 g
Per-meal doses studied for muscle protein synthesis run about 20–40 g of high-quality protein, with the upper half of that range favoured for larger athletes and older adults.
Source: Jäger et al., Journal of the International Society of Sports Nutrition 2017 — “General recommendations are 0.25 g of a high-quality protein per kg of body weight, or an absolute dose of 20–40 g.”
Common questions about Optimum Nutrition Gold Standard 100% Casein
How much of a Optimum Nutrition Gold Standard 100% Casein scoop is actually protein?
24 g of protein from a 34 g serving — about 71%. The rest is flavoring, fats, carbs, and whatever else the label lists. A higher percentage means less filler per scoop.