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Supplement Facts Labels: Active Ingredients and Dose

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

The Supplement Facts panel lists each active (dietary) ingredient with its Amount Per Serving and, where one exists, a...

The Supplement Facts panel lists each active (dietary) ingredient with its Amount Per Serving and, where one exists, a %DV. Read it to confirm the actual dose you're getting, check whether a serving is several capsules, and watch for proprietary blends that give only a combined weight. A dagger symbol means no Daily Value has been established for that ingredient.

Key Takeaways

  • The Supplement Facts panel lists each active ingredient with its Amount Per Serving — the real dose you're getting.
  • Amounts are per serving, and a serving may be several capsules, so check servings per container.
  • A dagger (†) in the %DV column means no Daily Value has been established for that ingredient.
  • Proprietary blends give only a combined weight, hiding how much of each ingredient is present.
  • 'Other Ingredients' lists fillers, binders, and allergens — worth scanning for things to avoid.

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The Panel That Actually Matters

Marketing is on the front of the bottle; the facts are on the back. In the U.S., the FDA requires a Supplement Facts panel that lists the dietary ingredients and their amounts [1]. Learning to read it is the single best way to know what you're really taking. (For a broader walkthrough, see How to Read Supplement Labels.)

Active Ingredients and 'Amount Per Serving'

Each active (dietary) ingredient appears with an Amount Per Serving — the quantity in one serving, in mg, mcg, IU, or similar. Two things to check immediately:

  • Serving size. The amounts are *per serving*, and a serving may be 2 or 3 capsules. A 60-capsule bottle at 2 capsules per serving is only a 30-day supply.
  • The actual dose. Compare the Amount Per Serving to the dose that has actually been studied for your goal — many products contain less than a studied amount (see [Clinically Studied vs Proven](/learn/clinically-studied-vs-proven)).

The %DV Column

Next to many nutrients is a % Daily Value (%DV) — how much one serving contributes to a daily reference intake. A dagger (†) symbol means no Daily Value has been established for that ingredient (common for botanicals and amino acids). For how %DV is calculated and its limits, see Percent Daily Value Explained.

Proprietary Blends: The Hidden-Dose Problem

If you see a 'Proprietary Blend' followed by a single total weight and a list of ingredients, the label is telling you the blend's combined amount but not how much of each ingredient it contains. That makes it impossible to know whether any one ingredient is present at a meaningful dose (see Proprietary Blends Explained).

'Other Ingredients'

Below the panel, Other Ingredients lists non-dietary components — fillers, binders, capsule material, flavors, and allergens. This is where to look for things you may want to avoid.

A Quick Reading Checklist

1. What's the serving size, and how many servings per container?

2. What's the Amount Per Serving of the ingredient you care about?

3. Does that dose match what was studied?

4. Is it hidden inside a proprietary blend?

5. Anything in Other Ingredients to avoid?

Frequently Asked Questions

What does 'Amount Per Serving' mean on a supplement?

It's the quantity of each ingredient in one serving — not per capsule and not per bottle. Since a serving might be two or three capsules, always check the serving size and how many servings the container holds before comparing doses or prices.

What does the dagger symbol mean?

The dagger indicates that no Daily Value has been established for that ingredient, which is common for botanicals, amino acids, and other compounds without a set reference intake. It doesn't say anything about safety or effectiveness — only that there's no official %DV.

Why are proprietary blends a problem?

A proprietary blend lists several ingredients under one combined weight without disclosing how much of each is included. That means a blend could be mostly a cheap filler ingredient with only a token amount of the one you want, and you'd have no way to tell from the label.

Where do I find allergens and fillers?

Look at the 'Other Ingredients' line below the Supplement Facts panel. It lists non-dietary components such as binders, capsule material, flavors, and common allergens — the place to check if you're avoiding a specific additive.

References

  1. U.S. Food and Drug Administration (2024). Dietary Supplement Labeling Guide: Supplement Facts Panel. U.S. Food and Drug Administration.