100% Gold Standard Casein Protein
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$79.95
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RRP $84.95
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Description
Optimum Nutrition Gold Standard 100% Casein is a slow digesting protein powder made from micellar casein, the fraction of milk protein that forms a gel in the stomach and releases its amino acids over several hours rather than in one quick wave. That is why it is usually taken before bed or between meals rather than straight after training, where a whey powder makes more sense. Each heaping scoop supplies 24 g of protein. It comes as five packs: Chocolate Peanut Butter in both a roughly 821 g tub and a 1.75 kg tub, Cookies and Cream in roughly 821 g, Vanilla in roughly 821 g, and Chocolate in roughly 848 g. The stretch between dinner and breakfast is the longest a training person goes without protein, and casein is the powder people reach for to cover it, or to hold a long gap between meals during the day.
Product Strengths
- Each heaped scoop adds 24 g to the day's protein intake.
- 24 g of micellar casein protein per heaping 34 g scoop.
- Slow release protein: casein thickens in the stomach and is broken down gradually, which is why it is commonly used at night or between meals.
- Includes Aminogen, a protease enzyme blend added to the formula.
- Low in fat at 1 g and low in sugars at 1 g per serve.
- Four flavours across this pack: Chocolate Peanut Butter, Cookies and Cream, Vanilla and Chocolate.
- Two tub sizes: the smaller tub at about 821 g to 848 g and the larger Chocolate Peanut Butter tub at about 1.75 kg.
Suitable For / Not Suitable For
Suitable for: Active adults and athletes.
Not suitable for: Anyone with an allergy to the listed ingredients; Vegans, because it contains a dairy ingredient; Pregnant or breastfeeding women, unless advised by a health professional; Children, because it is for adults only; Anyone avoiding soy.
Nutrition Information
| Per serve, one heaping scoop (34 g) | Amount |
|---|---|
| Calories | 120 |
| Protein | 24 g |
| Total fat | 1 g |
| Saturated fat | 0.5 g |
| Cholesterol | 15 mg |
| Dietary fibre | 1 g |
| Total sugars | 1 g |
The panel is a United States Nutrition Facts panel, so energy is stated in Calories rather than kilojoules, with a per cent Daily Value column. A US Daily Value is not an Australian Recommended Dietary Intake and the two should not be read as the same thing. Read the pack for sodium, total carbohydrate and calcium.
Ingredients
- Micellar casein.
- Cocoa powder, processed with alkali, in the chocolate flavours.
- Natural and artificial flavour.
- Salt.
- Gum blend: cellulose gum, xanthan gum, carrageenan.
- Lecithin.
- Acesulfame potassium and sucralose.
- Protease, the Aminogen enzyme blend.
The ingredient list above is the chocolate flavour of the Gold Standard 100% Casein range, so the cocoa line will not appear on a vanilla or cookies and cream pack. Check the list on the tub you receive.
Allergens
Contains milk and soy. Casein is a milk protein and the lecithin is soy derived, so it is not suitable for anyone with a dairy or soy allergy, not suitable for anyone avoiding lactose entirely, and not suitable for vegans. Always review label for full list of ingredients.
Suggested Use
Add one heaping scoop to about 250 mL to 300 mL of water or the beverage of your choice, cover and shake for 25 to 30 seconds. It can be taken at any time of day, including before bed.
Warnings
This is a protein food, not a medicine, and it is not a substitute for a varied diet. Not suitable for children except under medical or dietetic supervision. If you are pregnant, breastfeeding, or have a kidney condition, talk to your doctor or dietitian before adding a concentrated protein powder to your diet. Keep out of reach of children.
Storage
Store in a cool, dry place, out of direct sunlight, and keep the lid firmly closed. Use the scoop provided and keep it dry.
Disclaimer
Always read the label and follow the directions for use. This product is not a substitute for a balanced diet. This information is general in nature and is not a substitute for advice from your doctor or dietitian.
Optimum Nutrition Gold Standard 100% Casein is a slow digesting protein powder made from micellar casein, the fraction of milk protein that forms a gel in the stomach and releases its amino acids over several hours rather than in one quick wave. That is why it is usually taken before bed or between meals rather than straight after training, where a whey powder makes more sense. Each heaping scoop supplies 24 g of protein. It comes as five packs: Chocolate Peanut Butter in both a roughly 821 g tub and a 1.75 kg tub, Cookies and Cream in roughly 821 g, Vanilla in roughly 821 g, and Chocolate in roughly 848 g. The stretch between dinner and breakfast is the longest a training person goes without protein, and casein is the powder people reach for to cover it, or to hold a long gap between meals during the day.
Product Strengths
- Each heaped scoop adds 24 g to the day's protein intake.
- 24 g of micellar casein protein per heaping 34 g scoop.
- Slow release protein: casein thickens in the stomach and is broken down gradually, which is why it is commonly used at night or between meals.
- Includes Aminogen, a protease enzyme blend added to the formula.
- Low in fat at 1 g and low in sugars at 1 g per serve.
- Four flavours across this pack: Chocolate Peanut Butter, Cookies and Cream, Vanilla and Chocolate.
- Two tub sizes: the smaller tub at about 821 g to 848 g and the larger Chocolate Peanut Butter tub at about 1.75 kg.
Suitable For / Not Suitable For
Suitable for: Active adults and athletes.
Not suitable for: Anyone with an allergy to the listed ingredients; Vegans, because it contains a dairy ingredient; Pregnant or breastfeeding women, unless advised by a health professional; Children, because it is for adults only; Anyone avoiding soy.
Nutrition Information
| Per serve, one heaping scoop (34 g) | Amount |
|---|---|
| Calories | 120 |
| Protein | 24 g |
| Total fat | 1 g |
| Saturated fat | 0.5 g |
| Cholesterol | 15 mg |
| Dietary fibre | 1 g |
| Total sugars | 1 g |
The panel is a United States Nutrition Facts panel, so energy is stated in Calories rather than kilojoules, with a per cent Daily Value column. A US Daily Value is not an Australian Recommended Dietary Intake and the two should not be read as the same thing. Read the pack for sodium, total carbohydrate and calcium.
Ingredients
- Micellar casein.
- Cocoa powder, processed with alkali, in the chocolate flavours.
- Natural and artificial flavour.
- Salt.
- Gum blend: cellulose gum, xanthan gum, carrageenan.
- Lecithin.
- Acesulfame potassium and sucralose.
- Protease, the Aminogen enzyme blend.
The ingredient list above is the chocolate flavour of the Gold Standard 100% Casein range, so the cocoa line will not appear on a vanilla or cookies and cream pack. Check the list on the tub you receive.
Allergens
Contains milk and soy. Casein is a milk protein and the lecithin is soy derived, so it is not suitable for anyone with a dairy or soy allergy, not suitable for anyone avoiding lactose entirely, and not suitable for vegans. Always review label for full list of ingredients.
Suggested Use
Add one heaping scoop to about 250 mL to 300 mL of water or the beverage of your choice, cover and shake for 25 to 30 seconds. It can be taken at any time of day, including before bed.
Warnings
This is a protein food, not a medicine, and it is not a substitute for a varied diet. Not suitable for children except under medical or dietetic supervision. If you are pregnant, breastfeeding, or have a kidney condition, talk to your doctor or dietitian before adding a concentrated protein powder to your diet. Keep out of reach of children.
Storage
Store in a cool, dry place, out of direct sunlight, and keep the lid firmly closed. Use the scoop provided and keep it dry.
Disclaimer
Always read the label and follow the directions for use. This product is not a substitute for a balanced diet. This information is general in nature and is not a substitute for advice from your doctor or dietitian.
Casein Protein
The slow-release protein for overnight.
Casein clots in your stomach, so it releases its amino acids slowly rather than all at once. That's why people take it before bed, to keep their body building through the night.
Christina HanleyBHSc (Nutritional Medicine), Health Content Lead
Checked this page October 2026
See what we checked
Is this the right protein powder for you?
Common questions
What's the difference between casein and whey?
Both are milk proteins, but they behave differently once you drink them. Whey stays liquid in your stomach and passes through quickly. Casein clots into a gel, so it releases its amino acids over several hours. In the one trial that tested them head to head overnight, the two worked the same, so casein is a genuine slow-release protein, but not a proven better one.
Is micellar casein the same thing as casein?
Yes, just filtered rather than treated with acid. Australia's permitted ingredients list (Schedule 1) has CASEIN at item 1229 and CALCIUM CASEINATE at item 1071, and there's no separate entry for 'micellar casein'. It's covered by the general CASEIN entry, because it's the same protein, gently filtered from milk rather than separated out with acid the way caseinate is.
How much, and when
Food sources
The evidence, and its limits
The Australian rules
Not sure this is the right form for you? Ask one of our naturopaths. It is free and takes 10 minutes.
Casein Protein is one form of Protein Powder. Always read the label and follow the directions for use. General information only, and not a substitute for advice from your doctor or one of our naturopaths.