A protein bar carries a Nutrition Facts panel and a protein powder often carries a Supplement Facts panel. The visual similarity hides a regulatory distinction that changes what the numbers mean.
The product category determines the panel
Foods and beverages sold as conventional food carry Nutrition Facts. Products marketed as dietary supplements, including many powders, capsules and drinks, carry Supplement Facts instead.
The choice is not cosmetic. It follows from how the manufacturer positions the product, and it pulls a different set of labeling requirements along with it.
This is why two nearly identical powders on adjacent shelves can present their contents in different formats.
Supplement Facts can list ingredients without established values
Nutrition Facts is restricted to a defined list of nutrients with recognized reference values. A conventional food label cannot simply add a row for a botanical extract.
Supplement Facts can list any dietary ingredient, including herbs, amino acids and compounds with no established daily reference amount. Those rows show a quantity and a dash where the percentage would be.
The dash is informative. It signals that no reference value has been set, not that the amount is trivial.
Proprietary blends group amounts together
A Supplement Facts panel may declare a group of ingredients as a proprietary blend, listing the total weight of the blend and the ingredients in descending order by weight.
The individual quantities are not disclosed. A blend can therefore be dominated by its cheapest component while still naming the ingredient a buyer is looking for.
Descending order remains the one useful signal, because it establishes the ranking even when the amounts are hidden.
Pre-market review works differently
Conventional foods and drugs face different approval pathways, but neither resembles the supplement route. Dietary supplements are not approved for safety and effectiveness before sale.
Responsibility for ensuring a product is safe and accurately labeled sits with the manufacturer. Regulatory action generally follows problems in the marketplace rather than preceding sale.
Structure and function statements on the front of the package are permitted under this framework, which is why they are phrased around supporting a normal process rather than treating a condition.
Reading the panel as evidence of process
A panel that names specific ingredients with individual amounts, identifies the plant part and extract form for botanicals, and avoids blends is disclosing more than one that does not.
None of that establishes that the contents match the label, which is a manufacturing question rather than a labeling one.
Anyone taking prescription medication, managing a diagnosed condition, or considering a supplement during pregnancy should raise it with a physician or pharmacist, since interactions are decided case by case.