How to Read a Supplement Label

Start with serving size. A capsule may be one serving, but a powder may be 10 g. If the label says 'per serving' and you take two capsules, you get double the dose. Next, scan the %NRV column. A value of 50% NRV for vitamin C means 40 mg, not 500 mg. For minerals like magnesium, 100% NRV is 375 mg in the EU. If the %NRV is missing, the product may be marketed as a food supplement without full nutritional declaration, which is a red flag for EU compliance.

Then check the ingredient forms. Magnesium oxide is 60% elemental magnesium by weight but absorbs poorly. Magnesium citrate delivers less elemental magnesium but is better absorbed. The same applies to zinc picolinate versus zinc sulfate. A label that lists 'proprietary blend' without quantities is a black box. You cannot verify doses, and regulators in the US and EU increasingly challenge such labels. For a brand owner, this means your contract manufacturer must disclose every active quantity per serving.

Two products can list '500 mg vitamin C' and perform differently. Ascorbic acid is the standard form. Sodium ascorbate is buffered and gentler on the stomach. Calcium ascorbate is non-acidic. The label must state the exact form. If it only says 'vitamin C', that is legal in some markets but unhelpful. For a US or EU brand, specifying the form on the label builds trust and reduces returns. The same logic applies to B12: cyanocobalamin is stable and cheap; methylcobalamin is active but costs 5-10 times more per kilogram.

Bioavailability also depends on excipients. A tablet with dicalcium phosphate as a filler may bind minerals and reduce absorption. A capsule with rice flour is inert. Look for 'other ingredients' listed in descending order by weight. If magnesium stearate is first, the product contains more lubricant than active. That is not necessarily unsafe, but it signals a low-cost formulation. For a retail SKU with a 1,000-unit MOQ, you can specify a clean label: no titanium dioxide, no artificial colours, and a short excipient list.

Certification logos are not decoration. A GMP certificate must be issued by a recognised body, such as NSF, SGS, or a national competent authority. ISO 22000 covers food safety management. HACCP is a prerequisite. Halal certificates must come from a recognised authority; a self-declared logo is worthless. Organic claims in the US require certification. In the EU, the organic logo requires EU organic certification. Vegan claims are usually self-declared but can be verified by bodies like the Vegan Society.

Health claims are another red flag. In the EU, only claims from the EU Register of Nutrition and Health Claims are allowed. 'Supports immune health' is permitted for vitamin C and zinc, but 'prevents colds' is not. In the US, structure-function claims must carry a disclaimer: 'This statement has not been evaluated by the FDA.' Never claim FDA approval. A facility can be FDA-registered, but that is not an approval. If a label claims 'FDA approved', walk away. For a brand owner, your label review should include a regulatory check per market before you print 5,000 units.

Every claim printed on a supplement label should be traceable to a batch record and a certificate of analysis (COA). At a minimum, a finished batch is tested for identity of each active ingredient, potency against the label claim, microbial limits (total aerobic count, yeast and mould, E. coli, Salmonella), heavy metals (lead, arsenic, cadmium, mercury) and disintegration or dissolution time. Identity testing is usually done by HPLC, FTIR or titration, depending on the raw material. Potency results are expressed as a percentage of label claim, and a common internal specification is 95 to 105 percent at release, with tighter limits for vitamins that degrade quickly.

Testing happens at three points: incoming raw materials, in-process or bulk powder, and finished goods. Raw material COAs from the supplier are not sufficient on their own; a contract manufacturer should re-test at least the critical actives and any material with a history of adulteration, such as botanical extracts. Finished-goods testing confirms that blending, drying and compression did not reduce potency or introduce contamination. Disintegration testing matters for tablets and capsules because a product that does not break down within the pharmacopoeial window (typically 15 to 30 minutes depending on the method) will not release its actives.

The COA you receive should list the batch number, manufacturing and expiry dates, the test method used, the specification range, the actual result and a pass or fail statement, signed by a qualified person. A COA that only states 'conforms' without numeric results is weak evidence. Ask whether the laboratory is internal or third-party accredited, and whether micro and heavy metal results are from the same batch or carried over from a previous one.

Retention samples are kept from every batch, usually for the shelf life plus 12 months, stored under label conditions. A stability protocol normally covers 0, 3, 6, 12, 18 and 24 months at 25 degrees Celsius and 60 percent relative humidity, with accelerated conditions at 40 degrees Celsius and 75 percent relative humidity for six months. These data support the expiry date on the supplement label and are the first thing a regulator or major retailer will request.

Packaging choice drives cost, shelf life and retail acceptance. High-density polyethylene bottles with induction seals suit capsules and tablets in counts from 30 to 180; blisters suit pharmacy and travel formats; stick packs and sachets suit powders at 5 to 30 grams per unit. Bottle diameters and cap sizes should be standardised where possible, because non-standard tooling adds to lead time. Desiccant canisters or silica gel sachets are added for hygroscopic formulas, and the label substrate should be chosen for the surface: glossy film for bottles, matte paper for cartons.

For the US market, the dietary supplement label must carry a Supplement Facts panel with serving size, amount per serving, percent daily value where established, and a list of other ingredients in descending order of weight. The statement of identity, net quantity, and the name and place of business of the manufacturer, packer or distributor are mandatory. Structure-function claims require the standard disclaimer that the statement has not been evaluated by the FDA and the product is not intended to diagnose, treat, cure or prevent any disease. For the EU, Regulation 1169/2011 governs nutrition labelling and the NRV percentages differ from US daily values, so a single label artwork rarely serves both markets without revision.

Lot and expiry coding should be applied at packing, not pre-printed on cartons, so that a single print run can serve multiple batches. Common formats are a lot number with a Julian date plus a best-before date in DD/MM/YYYY or MM/YYYY. Carton specifications typically include corrugated board grade, dimensions, gross weight and a barcode, and pallet specifications cover pallet type (Euro 1200 by 800 mm or 48 by 40 inch), layers per pallet, units per layer and stretch-wrap requirements.

Amazon sellers need an FNSKU label on each sellable unit, applied over the barcode or on a separate label, plus carton labels with quantity and expiry. Retail chains often require GS1 barcodes registered to the brand owner, not the factory, and may ask for a packaging specification sheet and dieline approval before printing. Confirm who owns the artwork files and who pays for plate changes, because a late artwork revision is one of the most common causes of missed launch dates.

Sampling usually takes 7 to 15 working days once the formula and supplement label artwork are approved, and stock formulas can be faster. Custom formulas with new flavour systems or novel ingredients may need a second round. Samples are typically supplied free or at cost, with the buyer paying courier charges. Production then runs 25 to 35 working days for standard capsules and tablets, and 30 to 45 working days for gummies, liquids or effervescents, which need additional curing, filling or drying steps.

Minimum order quantities vary by dose form. Capsules and tablets commonly start at 1,000 bottles per SKU, blisters at 10,000 to 20,000 units, and sachets at 30,000 to 50,000 units, because filling lines need a minimum run to be economical. MOQ is lower when the buyer accepts a stock formula and standard packaging, and higher when custom tooling or a new bottle mould is required. Ask whether the MOQ applies per SKU or per order, since mixed-SKU orders can reduce the effective threshold.

Air freight takes 5 to 10 days door to door and suits launches or replenishment; sea freight takes 25 to 40 days port to port depending on the lane, and is the default for full containers. Less-than-container loads add 7 to 14 days because of consolidation. Incoterms matter: EXW leaves all export clearance and freight to the buyer, FOB places loading on board at the named Chinese port on the seller, and DDP means the seller delivers to the buyer's door with duties paid, which is convenient but usually carries the highest unit price.

A standard export document pack includes the commercial invoice, packing list, bill of lading or air waybill, COA for each batch, material safety data sheet where the product contains regulated substances, and a free-sale certificate or health certificate for many destination markets. Phytosanitary certificates apply only to plant-based raw materials and are issued by the local authority, not the factory. Confirm which documents the destination customs broker requires before production starts, because replacing a missing certificate after shipment can delay clearance by weeks.