How to Read a Dietary Supplement Label Like a Toxicologist

The parts of a label

Federal rules set out what a dietary supplement label must carry: a statement of identity (the name and the words dietary supplement), net quantity, a Supplement Facts panel, a list of other ingredients, and the name and place of business of the manufacturer, packer or distributor ^[1]. The Supplement Facts panel itself follows a format set in federal regulations ^[2]. Knowing this structure tells you where to look for each piece of information, and what is missing.

Serving size first

Every number on the panel is per serving, so start there. NerveHoney's serving is two capsules, and a bottle holds 30 servings. A product whose serving is three or four capsules may look stronger per serving and weaker per capsule; one with a serving of one capsule may need two a day in the directions. Check that the serving size and the directions agree.

Then work out the cost per serving, which is the honest way to compare prices between products of different sizes.

Amounts and Daily Values

For vitamins and minerals, the panel shows an amount and a percent Daily Value. For herbs, there is no Daily Value, so the panel shows a dagger symbol and a note that the Daily Value is not established. That is normal, not a red flag.

What matters for herbs is whether each one has an amount at all. NerveHoney lists 145, 110, 100, 50 and 45 mg. Many products instead list a single proprietary blend weight with the ingredients beneath it in descending order, which tells you which herb is most abundant but not how much of any of them you get.

Plant part, form and ratio

For botanicals, three details decide what the milligrams mean.

Other ingredients

This line lists everything that is not an active ingredient: capsule material, fillers, flow agents, colors. NerveHoney's are microcrystalline cellulose (a plant fiber filler), hydroxypropyl methylcellulose (a vegetable capsule) and magnesium stearate (a flow agent). These are standard and generally harmless. Watch this line for allergens, gelatin if you avoid animal products, artificial colors, and stimulants that sometimes appear here rather than in the panel.

Claims and the disclaimer

Supplements may make structure or function claims, such as supports healthy nerve function, but not disease claims, such as treats neuropathy. A structure or function claim must carry the disclaimer that the FDA has not evaluated it and that the product is not intended to diagnose, treat, cure or prevent any disease ^[3].

Read claims last, after the facts. If the label is modest and the sales page promises nerve regeneration, the label is the more reliable document. NerveHoney's bottle says Advanced Support; its sales page goes much further.

What the label will not tell you

• Whether the product contains what it says. The FDA does not test supplements before sale; manufacturers must follow good manufacturing practice rules ^[4], but verification is up to them.
• Whether the doses work. There is no minimum effective dose on a label.
• Whether it is safe with your medicines. That needs a pharmacist.
• Where the herbs were grown, or how they were tested, unless a certificate of analysis is published.

For those questions, look for third-party testing seals from recognized programs, ask the seller for a certificate of analysis for your lot, and check ingredients against NIH resources ^[5].

Third-party seals and certificates of analysis

Because the FDA does not check supplements before sale, independent testing programs fill part of the gap. Seals from recognized programs indicate that a lab has checked that the product contains what the label says, in the stated amounts, and is free of specified contaminants. They do not say the product works. A certificate of analysis, or CoA, is a lab report for a specific lot, listing identity tests, potency and contaminant results such as heavy metals and microbes.

NerveHoney's label carries no third-party seal, and the seller publishes no CoA. That is common in direct-response supplements and not proof of a problem, but it means you are relying on the manufacturer's word. You can ask the seller for the CoA for your lot number; a company confident in its testing usually provides one ^[4].

Label words that mean less than they seem

• Natural. Not a regulated term for supplements. Corydalis is natural, and so is its liver signal.
• Clinically studied ingredients. Often means some study exists on the ingredient, at some dose, for some purpose, not on this product.
• Doctor formulated. Unverifiable unless the doctor is named, and says nothing about evidence.
• Made in an FDA-registered facility. Registration is a legal requirement for food facilities, not an approval ^[6].
• Pharmaceutical grade. Has no defined meaning for herbal supplements.
• Advanced formula. A marketing phrase; NerveHoney's bottle uses Advanced Support.

Expiration dates and lot numbers

Two small details on the bottle are easy to overlook. A lot or batch number ties your bottle to a production run, which is what a certificate of analysis or a recall notice refers to; keep it with your receipt. An expiration or best-by date tells you how long the maker guarantees the stated amounts, since herbal compounds degrade over time, faster in heat and humidity. A missing lot number makes problems harder to trace. Check both when the bottle arrives.

A ten-second checklist

1. Serving size and servings per container
2. Every active ingredient has an amount
3. Plant part named for every herb
4. Form and ratio or standardization stated
5. No surprises in other ingredients
6. Claims limited to structure and function, with the FDA disclaimer
7. A real company name and address

NerveHoney passes 1, 2, 5 and 7, partly passes 3 and 4, and its bottle passes 6 while its sales page does not. See the full panel in our ingredient ledger.