Find the panel first
Before the front, before the badges, before the reviews. If there is no photograph of one on a listing, ask the seller for one before you buy rather than after.
The One Document That Makes A Supplement Checkable
Everything on the front of a bottle was chosen by a marketing department. One panel on the back was not, and it is the only part you can actually use.
Quick answer
A Supplement Facts panel is required on dietary supplements sold in the United States under 21 CFR 101.36. It must carry the serving size, the number of servings per container, the name and amount per serving of every dietary ingredient, the percent of the Daily Value where one exists, and an other-ingredients line. Each of those answers a practical question a buyer actually asks, and without the panel none of them can be answered from the label at all.
A supplement label has two halves
The first half is the front. A wordmark, a colour scheme, a photograph or an illustration, a tagline, and two or three phrases about what the product supports. Every element of it was chosen by somebody whose job is to sell the bottle.
That is not a criticism. It is what packaging is for, and a brand with no front panel would sell nothing. But it means the front of a supplement is an argument rather than a record.
The second half is the Supplement Facts panel. Its content, its order, its units and in places its typography are set by federal regulation. The manufacturer chooses what goes in the capsule; the panel format decides how it must be described.
That distinction is the whole reason the panel is worth more than everything else on the bottle put together. It is the only part written to a format the seller did not choose.
What the panel has to carry
21 CFR 101.36, in ordinary English. Most summaries stop after the second row.
| Line | What it does for a reader |
|---|---|
| Serving size | Converts a container into a supply. Two capsules, one scoop, one tablet. Without it, a capsule count is just a number of objects. |
| Servings per container | Follows from the first, and is what lets you work out a cost per day. |
| Each dietary ingredient, by name | Says what is actually in it, in a fixed order, using recognised names rather than marketing ones. |
| The amount per serving | The single most useful number on any supplement. It is what lets an amount be compared with a study. |
| Percent Daily Value | For ingredients that have one. It puts the amount in proportion to a published reference intake. |
| A footnote | For ingredients with no established Daily Value, marked with a dagger. This is where that symbol lives. |
| Other ingredients | Everything present that is not a dietary ingredient: the capsule shell, fillers, flow agents. It is where allergens and gelatin turn up. |
Seven lines. Between them they answer how many, how long, what, how much, compared with what, and what else is in there.
About the product behind this blog
Livpure is a liver supplement in 60-capsule bottles with no Supplement Facts panel in anything supplied to us. Six ingredients are named and not one carries an amount. We publish the gap rather than filling it.
Order NowRead the label firstWhat a reader can do with it in thirty seconds
Turn the bottle round and count two things. How many ingredients carry a weight, and how many are inside a proprietary blend with only a total. Write the ratio down. That one number tells you more about a product's disclosure than any amount of front-panel copy.
Then look at the serving size and multiply. A label showing 500 mg per serving at two capsules a serving is 250 mg a capsule, and a bottle of sixty is thirty servings. That arithmetic takes ten seconds and it is the difference between a supply figure and a pile of capsules.
Then look for standardisation on anything described as an extract. A percentage of a marker compound is what turns milligrams into a comparable dose, and its absence is the second most common gap in this category.
Then read the other-ingredients line, which is the part almost nobody reads and the part most likely to contain something that matters to you personally: gelatin, soy, a colour, a sweetener.
That is the whole method. It works on any supplement in any aisle, and it takes less time than reading the front.
The ratio is the shortcut
Ingredients with a printed amount versus ingredients without. A product where the answer is six and zero has told you nothing. A product where it is seventeen and zero has told you everything. Most sit in between.
What a proprietary blend does to all of this
A proprietary blend is the common way a panel gives less than it looks like it gives. Under 21 CFR 101.36(c) a blend declares the total weight of all its dietary ingredients and lists them in descending order of predominance by weight, and individual amounts are not required.
It is legal, it is widespread, and it protects a real commercial interest: a formula that took work to arrive at should not be copyable off the back of a bottle.
The side effect is that the buyer cannot evaluate the product either. If ten ingredients share 600 mg, the tenth could be 60 mg or it could be a trace.
One thing survives. Descending order is a mathematical statement: the ingredient in position n cannot exceed the total divided by n. That gives you a ceiling for every position, which is not an amount but is not nothing, and it is the only arithmetic a blend permits.
Which is worth saying plainly: a blend is a weaker disclosure than a full panel and a much stronger one than no panel at all. At least a blend gives you a total.
And what is left when there is no panel
Nothing, is the short answer, and it is the reason this post exists on this particular website.
Without a serving size, a capsule count is not a supply figure and a price is not a cost per day. Without amounts, no ingredient can be compared with any study, and no interaction can be weighed by a pharmacist. Without an other-ingredients line, the capsule shell is unknown, which means a vegetarian claim cannot be checked and an allergen cannot be ruled out.
Without the footnote convention, a dagger on the front of a bottle has nowhere to point.
The product this site sells has no Supplement Facts panel in anything that was supplied to us. We have built the whole site around that absence rather than around the marketing that was supplied instead, and this post is the general version of why.
If you take one thing from it, take the habit: before you read anything else on a supplement, find the panel. It is the part that has rules attached, and it is the part a seller cannot write freely.
Three habits worth keeping
Photograph the panel you have
Keep the photographs of everything you take in one album on your phone. It survives the bottle being thrown away and it is the most useful thing you can hand a pharmacist.
Count, do not read
Ingredients with an amount against ingredients without. Ten seconds, one ratio, and it cuts through everything else on the packaging.
A complete panel is not a verified one
Everything in this post is about what a panel discloses, not about whether the disclosure is accurate. A perfectly compliant panel can carry amounts nobody has tested. NCCIH's note that some milk thistle products contain silymarin substantially different from what the label states is a reminder of exactly that. A panel is a floor, not a verdict — but a floor is considerably better than nothing.
Where the panel came from
The Dietary Supplement Health and Education Act of 1994 created the modern category. Before it, the boundary between a food, a supplement and a drug was contested in a way that produced a great deal of litigation and very little clarity for shoppers.
The bargain it struck was straightforward. Supplements would not need pre-market approval of their formulas or their claims, which is a substantial liberty. In exchange, they would have to disclose what they contained in a standard format, and certain claims would have to carry a statement making the absence of approval explicit.
The Supplement Facts panel is the disclosure half of that bargain. It is the part of the deal the buyer got.
Which is why a product without one is not simply badly labelled. It is a product taking the liberty without the disclosure that was supposed to come with it.
What the panel still does not tell you
It is worth being even-handed, because a panel is not a guarantee of anything.
It does not tell you whether the amounts printed are the amounts present. That requires testing, which the panel does not represent.
It does not tell you whether the ingredient works, at that amount or any other. That is what the research is for, and for many supplement ingredients the research does not converge.
It does not tell you whether an extract is standardised unless the label chooses to say so, and many do not.
And it does not tell you who made it, unless the distributor line happens to name a manufacturer, which is not required and frequently does not happen.
So the honest summary is that a panel is necessary and not sufficient. It is the floor below which a product cannot be assessed at all, which is precisely why its absence is the most serious thing this desk has found on any label.
For a worked example of an ingredient that has a Daily Value and no printed amount, see Molybdenum: The Mineral Almost Nobody Is Short Of, and for the numbers most liver supplement studies report instead of a panel, ALT And AST.