How To Read A Supplement Label Properly

Published 2026-10-24

Start with the serving size

Every number on a supplement panel is per serving, and a serving is whatever the company says it is. Two products can quote the same milligram figure while one means one capsule and the other means three. Check the serving first and the count per bottle second, because together they tell you how long a bottle actually lasts.

Then look for the word proprietary

A proprietary blend gives you one combined weight for everything inside it, plus the order the ingredients are listed in, which by law runs heaviest first. That is the entire dataset. No individual amount is published.

Do the arithmetic anyway, because it puts things in scale. A 500 mg blend split evenly between fourteen ingredients is about 36 mg each. It will not be split evenly — the ordering proves that — but now compare 36 mg against the doses used in research: berberine trials run at 900 to 1,500 mg a day, cinnamon studies work in grams, and alpha-lipoic acid studies start around 300 mg.

Two things fall out of that. Botanicals in a blend are almost always well below trial doses. Micronutrients like chromium and biotin, which are needed in micrograms, can easily be supplied at useful amounts.

Extracts and standardisation

Three different things can share one plant name. Whole herb is dried ground plant, cheap and variable. An extract is concentrated, often labelled with a ratio like 10:1. A standardised extract is adjusted so a named compound sits at a guaranteed percentage, and it is the only one of the three you can compare between brands. Almost every clinical trial uses the third kind.

The other ingredients line

The capsule shell decides the vegetarian claim — vegetable cellulose rather than gelatin. A bulking agent like rice flour is there because capsules come in fixed sizes and the formula has to fill one. A flow agent such as magnesium stearate, used at well under one per cent, keeps fill weights consistent on the production line. None of those three is worth worrying about. Colours and sweeteners in a swallowed capsule are worth a second look, because nobody sees or tastes it.

Marks and badges

They are backed by very different things. GMP is audited and says the facility runs to a manufacturing standard — nothing about whether the formula works. Gluten free has an FDA definition and a threshold the company attests to. Natural has no regulated meaning at all, and neither does doctor formulated. A row of university or journal logos under a product headline reads as endorsement whatever the caption says, and those institutions have endorsed nothing.

One question to ask

Not whether it works — nobody answers that usefully. Ask how much of the leading ingredient is in a serving. A brand that tells you is telling you something, and so is a brand that will not.