Product Education

How to Read a Supplement Facts Panel

The Supplement Facts panel tells you almost everything about a product, if you know how to read it. Here is a plain-language walkthrough.

By Cardio Guardian Editorial TeamReviewed by Cardio Guardian Editorial TeamPublished June 17, 20256 min read

The Supplement Facts panel is the most honest part of any supplement — it is where the actual contents are spelled out in a standardized format. If you want to compare two products fairly, this box, not the marketing on the front of the bottle, is where to look. Here is a plain-language walkthrough of each part so you can read any label with confidence.

Serving size

Everything on the panel is “per serving,” so start here. A product might look potent until you notice the serving is several capsules taken together. Cardio Guardian, for example, uses a 3-capsule serving — so the amounts listed are what you get across those three capsules, not per single capsule. Checking the serving size first keeps every other number in context.

Amount per serving

This column lists each ingredient and how much of it is in a serving, using standard units:

• mcg — micrograms
• mg — milligrams
• IU — international units (still seen for some vitamins)

The key thing to check is simple: are the amounts actually listed for each ingredient? A transparent label answers yes. Which brings us to the next point.

Percent Daily Value (%DV)

For nutrients with an established Daily Value, the panel shows what percentage of that value a serving provides. This helps you see how a serving fits alongside the rest of your diet. Where no Daily Value has been set — common for amino acids and compounds like CoQ10 — you will see a dagger (†) and a footnote reading “Daily Value not established.” That is normal and expected, not a red flag.

Watch for proprietary blends

A proprietary blend lists several ingredients under one combined weight without telling you how much of each is inside. That makes it impossible to know whether an ingredient is present in a meaningful amount or just a pinch added for label appeal. A fully transparent label discloses each ingredient’s amount individually — no guessing required.

The “Other Ingredients” line

Below the main panel, “Other ingredients” lists things like the capsule material and any manufacturing aids. It is worth a glance, especially if you avoid particular ingredients for dietary or personal reasons.

Ingredient forms

The specific form of an ingredient matters, and a good label tells you which one is used. “Folate (as L-methylfolate)” or “B12 (as methylcobalamin)” signals the bioavailable, active form the body can use directly. The form is usually listed in parentheses right after the ingredient name. When two products list the same nutrient, the form can be the difference between them.

For more plain-language guides on this topic, browse reading a supplement label. FDA labeling guidance and its rules on structure/function claims sit behind the format described here.

The bottom line

A good Supplement Facts panel hides nothing: a clear serving size, per-ingredient amounts, honest %DV notation, named ingredient forms, and no vague blends. That transparency is exactly what we aim for on the Cardio Guardian panel — you can see every ingredient and amount for yourself and decide on the facts.

Frequently Asked Questions

What is the Supplement Facts panel?

It is the standardized box on a supplement label that lists the serving size and the amount of each ingredient per serving, so you can compare products on facts rather than marketing.

What does a dagger (†) mean on a supplement label?

The dagger points to a footnote reading 'Daily Value not established,' which is normal for ingredients like amino acids and CoQ10 that do not have an official Daily Value.

Why should I be cautious about proprietary blends?

A proprietary blend lists several ingredients under one combined weight without disclosing how much of each is present, so you cannot tell whether an ingredient is in a meaningful amount.

References & Further Reading

1. FDA — Dietary Supplement Labeling Guide
2. FDA — Structure/Function Claims