Sourcing ascorbic acid from China

Ascorbic acid duty and classification

Heading 2936 covers vitamins, their derivatives and certain mixtures. Unmixed ascorbic acid falls within the vitamin C and derivatives line, 2936 27 00 00. The table shows purchasing grades within that same commodity line, rather than separate tariff subdivisions. See the wider vitamins guide for the rest of the heading.

Read from the UK Trade Tariff on 18 October 2026, the supplied record shows 0% duty for goods from China, no anti-dumping or countervailing measure and no suspension. It attaches an export control for waste. The importer should confirm with their customs broker whether any waste-related requirement affects the proposed shipment, particularly if the material is rejected stock or intended for recovery.

Confirm the composition and intended use through finding your commodity code. Finished vitamin tablets and capsules are usually food preparations or medicines rather than this heading. Do not assume a powder containing carriers or other ingredients has the same classification as unmixed ascorbic acid.

Specify the acid, grade and intended use

Write ascorbic acid explicitly in the purchase specification. Do not accept an ascorbate salt as an interchangeable substitute. Agree food, feed, pharmacopoeia or laboratory grade, assay method, particle size, moisture specification and whether the material contains any coating or carrier. Ask for a batch certificate of analysis and stability data supporting the proposed retest or expiry date.

For supplement manufacture, check the chemical form against the permitted forms and plan the finished supplement labelling. For feed use, confirm with the FSA whether feed additive authorisation is required for the proposed product and use. For pharmaceutical use, obtain the manufacturing and grade evidence described in the wider vitamins guide. Establish the UK REACH position for non-food and non-feed uses before ordering.

If the powder will be sold as a food supplement, do not claim or imply that it treats, prevents or cures disease. Agree sealed, light-proof, moisture-resistant packing and storage instructions with the factory.

Worked duty example

Illustrative example, not a quote: Illustrative order: 10 tonnes of unmixed ascorbic acid under 2936 27 00 00, invoiced at £32,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £34,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £34,500, so it is £6,900. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Identity and assay: test a sample from the shipped batch for ascorbic acid identity and assay against the agreed grade; compare the result with the batch certificate.

Contaminants: arrange batch testing for heavy metals and microbiology, with residual-solvent testing where solvents are used in manufacture. Agree the acceptance specification before production.

Packing: check liners, seals, moisture ingress and damaged drums or bags. Compare batch labels and retest or expiry dates with the certificate and stability evidence.

Sampling: agree representative sampling during quality inspection, retain a reference sample and keep each laboratory result tied to the delivered batch.

What goes wrong

A certificate for a different batch does not establish the quality of the delivery. Substitution of an ascorbate salt changes the chemical form, while a coated or diluted powder may fail an assay intended for unmixed acid. Particle size that differs from the approved sample can also disrupt the buyer's mixing process.

Heat, light and humidity can reduce potency. Damp or poorly sealed packing can leave material unsuitable for the agreed process. Keep suspect batches separate while checking identity, assay and packing damage; resolve the discrepancy before using the powder.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.