Sourcing uridine from China

Uridine classification and duty

Read from the UK Trade Tariff on 1 October 2026, heading 2934 covers nucleic acids and their salts and other heterocyclic compounds. Its named uridine line is 2934 99 90 55, covering CAS 58-96-8 with purity by weight of 98% or more. The supplied data contains only this named uridine line.

The named line carries 6% duty for goods from China, with no anti-dumping or countervailing duty and no suspension shown. The record attaches controls labelled as exports of dangerous chemicals and waste, rather than import controls. Ask your customs broker to confirm their applicability to the transaction.

Give the broker the chemical identity, purity specification, composition and intended use to confirm the commodity code. Do not assume material below the named purity threshold or a formulated product belongs on this line. See the wider heterocyclic compounds guide for the rest of the heading.

Specify uridine identity, assay and intended use

Specify uridine by name and chemical identity, with an agreed assay method and reporting basis. Set acceptance criteria for related substances, water and residual solvents appropriate to your process. Ask for batch-specific analytical results and chromatograms, an English safety data sheet, storage instructions and retained samples.

For chemical supply, ask HSE to confirm UK REACH registration requirements as annual imports of the substance approach one tonne. For use as an active substance in human medicines, confirm MHRA registration and the Chinese factory's supporting documentation before ordering.

For food or supplement use, establish the ingredient's novel-food status and suitability for the proposed use before purchase. Novel foods need authorisation before being placed on the Great Britain market. A supplier's description of uridine as food grade does not establish its regulatory status.

Worked duty example

Illustrative example, not a quote: Illustrative order: 20 kg of uridine, purity by weight of 98% or more under 2934 99 90 55, invoiced at £3,500 free on board, with £990 of freight and insurance to the UK. The customs value is £4,490. Duty at 6% is £269.40. Import VAT at 20% is charged on the customs value plus duty, £4,759.40, so it is £951.88. Import taxes total £1,221.28; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £269.40 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: compare the label, purchase specification and batch certificate; commission an identity test against a suitable reference material.

Assay: check the reporting basis and analytical method, then independently test representative batch samples for assay and related substances.

Condition: inspect seals, liners and containers for damage, moisture ingress, contamination and unexpected changes in appearance.

Traceability: match every container to its batch certificate and sample record; keep received material separate until your agreed acceptance checks pass.

What goes wrong

An assay reported on a dry basis can appear to meet a specification written for material as received. An area-percentage chromatogram can also be mistaken for a quantitative assay. Agree the method and calculation basis before comparing suppliers, and investigate differences between the certificate and independent results.

Another purchasing error is treating uridine, a phosphate derivative and a finished supplement as interchangeable. Require the exact identity and composition in the purchase order, and obtain written agreement before the factory changes its manufacturing route or supplies a substitute.

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.