How to Read a Supplement Label: Every Line Explained

BioMedic Africa Editorial Desk Published 29 August 2026 · Last updated 29 August 2026 · Editorial policy

The serving size line

Everything else on the label is expressed per serving, so this is the first line to find. A serving may be one capsule, two, or a scoop.

A pack of sixty capsules with a two-capsule serving is a thirty-day supply, not a two-month one. This is the most common way that apparent value disappears on closer reading.

The amount per serving column

For vitamins and minerals, this should give a weight in milligrams or micrograms and often a percentage of a reference intake. For minerals specifically, look for the elemental amount: 500 mg of magnesium oxide supplies roughly 300 mg of magnesium, and absorbs poorly.

For botanicals, look for either a plain weight of dried plant material or an extract with a ratio such as 10:1. A 300 mg 10:1 extract is not the same as 300 mg of powder — it represents 3 g of raw material.

The form of each ingredient

Form determines absorption and tolerance. Vitamin D3 raises blood levels more effectively than D2. Magnesium glycinate is gentler than oxide. Calcium citrate absorbs without stomach acid; carbonate does not.

For herbal ingredients, the botanical name and plant part are the equivalent detail. Moringa leaf and moringa root are different products, and only one belongs in a supplement.

Proprietary blends

A proprietary blend gives one total weight for several ingredients without saying how much of each. It is legal in many markets and it makes evaluation impossible.

The commercial argument is recipe protection. The practical effect is that a blend can be almost entirely its cheapest ingredient, and nothing on the label would reveal it.

The rest of the pack

A complete label also carries a batch or lot number, an expiry date, storage instructions, the manufacturer or importer name and address, and any national registration number required in your country.

Missing batch numbers and expiry dates are a serious warning sign. So is a label with no address for anyone responsible for the product.

• Batch or lot number and expiry date, legibly printed
• Manufacturer or importer name and physical address
• NAFDAC number in Nigeria, FDA registration in Ghana
• The prescribed complementary medicine disclaimer in South Africa
• Storage instructions — relevant everywhere in a hot climate

Language that should stop you

Some phrases indicate a product marketed outside the rules: cures, treats, guaranteed results, no side effects, miracle, secret formula, doctor-approved without a named doctor, and clinically proven without a citation.

None of these tells you the product is unsafe. All of them tell you the seller is willing to say things they may not lawfully say, which is a reasonable basis for choosing someone else.

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