Every product that crosses the border needs a tariff classification. It decides the duty rate and which other rules apply at entry. For supplements, getting it right is harder than it looks, because "supplement" isn't a customs category.
This page explains how classification works for supplements moving between Canada and the US, why the code on a supplier invoice isn't enough, and how to keep origin and landed cost separate. It's general information, not customs advice. Your licensed customs broker or trade adviser makes the call for each product.
How the codes are built
Both countries use the international Harmonized System (HS). The first six digits are shared around the world. After that, each country adds its own digits:
- United States: the Harmonized Tariff Schedule of the United States (HTSUS) uses 10 digits.
- Canada: the Customs Tariff uses a 10-digit classification number, made up of an 8-digit tariff item and a 2-digit statistical suffix.
Because the last digits differ, a Canadian code on an invoice can't simply be copied into a US entry, or the other way around. The US International Trade Commission makes the same point: country-specific digits and descriptions can differ.
Start with a full product description
Classification depends on what the goods actually are, not what they're called in marketing. Send your broker the full facts:
- Complete composition, with each ingredient's amount.
- Physical form: capsule, tablet, powder, liquid or gummy.
- Intended use and directions.
- Packaging and how the goods are presented at import (retail-ready, bulk or in measured doses).
- Current label artwork.
Ask the manufacturer to replace vague terms like "health powder" or "natural blend" with the real formula. A broker given only a brand name and the word "supplement" is guessing.
Why supplements are tricky
Similar-looking products can fall under different chapters, depending on the facts. Supplements often come down to a question such as whether the goods are a food preparation (Chapter 21) or a medicament put up in measured doses (Chapter 30). Single vitamins, plant extracts and other ingredients have headings of their own.
The answer turns on composition, form and how the product is presented. It's decided under the legal rules: the General Rules of Interpretation and the section and chapter notes. Searching a product name in the tariff schedule is only a starting point.
Never pick a code for its duty rate
A lower duty rate doesn't justify a code that describes different goods. Classification is a compliance conclusion based on the product. Cost planning follows from it, not the other way round.
Wrong classification can mean back duties, penalties and delays, and it often comes up long after the shipment. Record the reasons for each conclusion, not just the number.
When the answer isn't clear
If the facts support more than one reasonable classification, get a ruling before you rely on it:
- US imports: you can request a binding ruling from US Customs and Border Protection (CBP). CBP's rulings database (CROSS) lets you read past rulings on similar goods. An old ruling for another product can give context, but compare its facts carefully.
- Canadian imports: the Canada Border Services Agency (CBSA) issues advance rulings on tariff classification. Its D-Memorandum D11-11-3 explains the process.
Give the reviewer the actual formula and presentation. A ruling only covers the facts it was given.
Origin is a separate question
Shipping from Canada doesn't make a product Canadian for trade purposes. Preferential duty under CUSMA (called USMCA in the US) depends on the product's rules of origin, which look at where the materials came from and how the goods were made.
Keep evidence of materials and production before you claim a preference. CUSMA doesn't require a set form for the certification of origin, but it does require certain information, and you need records to back it up. The CBSA's origin guidance explains the Canadian side. Ask your customs specialist to check the US side separately.
Keep health product rules separate too
Customs classification, product licensing and labelling are three different questions. Your NPN and Canadian label belong in the product file, but they don't decide the customs code or a preference claim. In the other direction, products entering the US face FDA requirements for food and dietary supplements at entry. See FDA requirements for selling supplements on Amazon.com.
Build a clear landed-cost record
When you review what a shipment really cost, keep each charge separate:
- Product cost and currency.
- Freight, insurance and handling.
- Classification and customs value.
- Origin treatment and supporting evidence.
- Duties, import taxes and other official charges.
- Brokerage, storage and final delivery.
Label estimates and actual charges differently. Compare the customs entry with the broker's invoice, so an official duty isn't confused with the broker's service fee. When a charge changes, find the reason before blaming the tariff code.
A shipment handoff checklist
Before each shipment, the file should hold:
- Product and formula version.
- Destination classification, with the reviewed reasons.
- Commercial invoice and customs value information.
- Origin treatment, if claimed, with evidence.
- Importer of record, broker and the product contact.
- Product-law and carrier checks for the route.
When to review again
Reopen the classification when the formula, manufacturer, packaging or presentation changes. Keep the reviewed file with the shipment documents, so you can explain what you imported and why that treatment was used. Future orders then start from facts you've already checked.
How we handle this
We keep classification, origin and product records together for the products we ship between Canada and the US, and we work alongside your broker rather than replacing them. See how this fits our Amazon operations work.
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