Protein · Formula check
Did Optimum Nutrition Gold Standard 100% Casein change its formula?
THE SHORT ANSWER · NO CHANGE ON FILE
No confirmed formula change is on file. The label Optimum Nutrition published, dated Sep 21, 2026, was read twice and 50 of 50 fields agreed. Archives have not yet been searched for earlier labels, so this is not proof the formula never changed.
- Current labelSeen Sep 21, 2026
- Earlier labels foundNone yet
- Archive searchNot done yet
- Label read twiceEvery field matched (50 of 50)
A missing earlier label is not proof that nothing changed. Source: Optimum Nutrition, optimumnutrition.com (opens in a new tab), seen Sep 21, 2026.
The labels, dated
One dated label on file. Each one has a source you can open.
A change counts only between labels of the same product, flavor, size and sales channel, both dated.
Current labelSeen Sep 21, 2026
Chocolate Supreme panel, 5 dosed lines · Optimum Nutrition
optimumnutrition.com (opens in a new tab)
Tastes different?
Check your tub against this label. Line by line.
Turn your tub to the Supplement Facts panel. If an amount differs, you hold a different label from the one read here. If every line matches, the label does not explain the difference.
| Declared line | Current label, Sep 21, 2026 |
|---|---|
| Calcium | 500 mg |
| Iron | 1.5 mg |
| Potassium | 230 mg |
| Magnesium | 85 mg |
| Zinc | 11 mg |
Serving on the label: 34g (About 1 Scoop) per serving. Read from Optimum Nutrition, Chocolate Supreme, dated Sep 21, 2026.
Signal Verified, here
What we checked. And the gaps, printed.
- Checked: Label read twice50 of 50 fields agreed on the Chocolate Supreme panel from optimumnutrition.com, dated Sep 21, 2026.
- Not yet: FlavorsRead: Chocolate Supreme. 3 of 4 flavors on the store are not read yet.
- Not yet: Where it's soldBrand's own store only. Retail labels have not been compared.
- Not yet: Earlier labels1 dated label on file. The archive search is not complete, so an earlier label may exist.
- Checked: MarketUS market only.
- Checked: Kept currentRechecked within 365 days. If it is not re-verified by Sep 21, 2027, the status comes off.
Not checked yet
- 3 of 4 flavors on the brand's store (2026-09-21) have no panel read yet.
- Retail labels have not been compared with the brand's own store.
- Earlier labels may exist that the Record has not recovered; a missing observation is not proof nothing changed.
Labels read from the brand's own store (DTC) channel only. Other channels may sell a different label. The panel is declared product-wide; flavor-specific panels read: Chocolate Supreme. US market only.
Label read twice. Both readings agree. Not a laboratory test, safety certification, or endorsement of the product. How Signal Verified works
Method
How this page was made.
What FormulaSignal did
- Read the label Optimum Nutrition published for Chocolate Supreme, dated Sep 21, 2026, twice and independently: 50 of 50 fields agreed.
- Kept that label with the day each was seen and its source.
- Counted a change only between two dated labels of the same flavor, size and sales channel: 0 confirmed changes on file.
- Printed every gap the Record knows about, above, instead of leaving it out.
What it did not do
- No look inside your tub. A product record does not establish what a particular container holds, and label dates are not manufacture dates.
- No taste test and no lab test. Every figure is what a label or a brand's own page declares, not what was measured in a tub.
- No score and no winner. Differences are measured and shown; nothing is rated.
- No payment and no preview. No brand paid to appear, and none saw this page before it was published.
- No health advice. Whether an ingredient or an amount suits you is a question for a clinician.
Evidence
Sources you can open. Each one dated.
Brand's own pageSep 21, 2026
The label shown here, read twice: 50 of 50 fields agreed
Optimum Nutrition · optimumnutrition.com (opens in a new tab)
Questions
Optimum Nutrition Gold Standard 100% Casein: formula questions
Did Optimum Nutrition Gold Standard 100% Casein change its formula?
No confirmed formula change is on file. The label Optimum Nutrition published, dated Sep 21, 2026, was read twice and 50 of 50 fields agreed. Archives have not yet been searched for earlier labels, so this is not proof the formula never changed.
My Optimum Nutrition Gold Standard 100% Casein tastes or feels different. Is it a new formula or a bad batch?
A label can answer half of that: whether the formula on the label changed. Compare the Supplement Facts panel on your tub with the label dated Sep 21, 2026 on this page (it declares Calcium 500 mg, Iron 1.5 mg and Potassium 230 mg per serving). If your amounts differ, you hold a different label from the one on file. If they match, the label does not explain the difference. FormulaSignal does not test what is inside a tub.
What did FormulaSignal check, and what not yet?
Checked: the Chocolate Supreme label from Optimum Nutrition, dated Sep 21, 2026, read twice with 50 of 50 fields matching. Not yet: 3 of 4 flavors on the brand's store (2026-09-21) have no panel read yet; Retail labels have not been compared with the brand's own store; Earlier labels may exist that the Record has not recovered; a missing observation is not proof nothing changed.
Will I find out if Optimum Nutrition Gold Standard 100% Casein changes its formula later?
Optimum Nutrition Gold Standard 100% Casein is re-checked within 365 days, and it is on the monitoring schedule so the next label change is looked for. Save it to your Locker free to keep its dated label beside the one you take. A change counts only when two dated labels of the same flavor, size and sales channel differ.
Keep reading
More on Optimum Nutrition Gold Standard 100% Casein.
Other Optimum Nutrition formula checks
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- Did Optimum Nutrition Platinum Igniter change?No change on file
- Did Optimum Nutrition Pre-Workout Amped change?No change on file
- Did Optimum Nutrition Creatine [+] change?No change on file
- Did Optimum Nutrition Gold Standard 100% Plant Protein change?No change on file
- Did Optimum Nutrition Gold Standard 100% Whey change?No change on file
Every formula check · How to tell if a formula changed · En español
Take Optimum Nutrition Gold Standard 100% Casein?
Know before you reorder.
Save it to your Locker free with this dated label. If a newer label differs from yours, you see both, dated, instead of finding out from the taste.