What to look for on a supplement label

Supplement labels are dense on purpose. The front uses a short claim and a large name. The details that let you compare one bottle with another are usually on the back, in the Supplement Facts panel and the ingredient list. This piece is about where to look. It is not a review of any brand.

The front of the package and the facts panel

Start on the back. Find the panel titled Supplement Facts. It should show a serving size, the number of servings in the container, and the amounts of the listed ingredients per serving. The front may highlight one ingredient or one phrase. Treat that as a headline, then check whether the panel supports it.

Serving size is not advice

The serving size is the amount the rest of the numbers refer to. If the panel says two capsules, the amounts below that line are for two capsules, not for one and not for the whole bottle. A larger serving size can make a number look more generous. Compare products using the same idea: amount per serving, and how big that serving is.

Form, amount, and other ingredients

The name of an ingredient is not the whole story. Magnesium, for example, may be listed as citrate, glycinate, oxide, or another form. The panel may also list an amount of elemental mineral, an amount of the whole compound, or both. Those are different numbers. Read the line carefully before you compare it with another product.

Below the panel, the other ingredients list shows things used to make the capsule, tablet, or flavor. It is the place to look if you are avoiding a particular additive, allergen, or sweetener. It will not tell you how the product feels to take.

Claims around the label

Phrases such as “supports” are not the same as evidence that a product treats a condition. In the United States, supplement labels are not allowed to claim that a product diagnoses, treats, cures, or prevents a disease, and a structure/function claim is still marketing. If a claim matters to you, look for the specific ingredient, the amount, and a source that is not the brand’s own advertisement.

What a label cannot tell you

• Whether you need the product.
• Whether the bottle contains what it lists, unless you have a separate test in front of you.
• How it will interact with medicines you take.
• Whether a higher number is a better choice.

A clear label is a starting point for a comparison. It is not a conclusion.