UK Herbal Products with THR Numbers: Read the Medicine Leaflet before Comparing with Supplements
Keep a named traditionally registered herbal medicine and a US dietary supplement on separate product-class records.
We have not performed hands-on testing of the products discussed. Manufacturer references and official guidance support the documented information below; comparison exercises are our editorial guidance.
A botanical search can return a traditionally registered herbal medicine as well as supplements containing a similarly named plant. A THR number on a UK leaflet identifies a particular registration context. It should not disappear when a comparison page groups everything under herbs. This guide examines the documentation distinction without recommending the medicine, comparing effects or advising substitution.
Start with the exact leaflet and registration reference
The consulted Kalms Day patient leaflet identifies a Traditional Herbal Registration holder and manufacturer and gives THR 01074/0235. It also identifies the exact named product and contains medicine-specific information. Save the full leaflet with its revision date rather than extracting the herbal ingredient name alone. The document is not a generic valerian-supplement panel that can be attached to an unrelated bottle.
Understand what type of evidence the scheme uses
MHRA’s THR application guidance describes evidence of traditional use and the registration framework. The government’s Herbal Medicines Advisory Committee explanation distinguishes this from separately demonstrated efficacy and refers to plausibility based on longstanding use and experience. Do not convert the THR reference into a claim that modern clinical trials have established every advertised effect. The scheme’s context and the exact registered product remain essential parts of the record.
Worked example: split an overly broad herbal comparison
Suppose an illustrative shortlist places Kalms Day and a US valerian supplement into a single valerian row with one shared label link. Split it into exact product rows. Keep the UK medicine leaflet and THR reference with Kalms Day, and the US product’s own Supplement Facts panel with the supplement. Add a country and product-class column. Similar plant wording does not turn the two into regional pack sizes of one interchangeable item.
Use the correct documentation for the actual country
A UK registration reference should not be treated as a universal EU authorisation, and a US supplement label should not be used to decide UK medicine status. Ask for the exact current regional documentation if a seller’s listing blurs those categories. This article does not verify the present stock of any seller or recommend purchasing a medicine through a supplement search. Its role is to preserve the registration type, named product and leaflet history so a qualified professional can review the correct information. Do not copy a medicine’s directions into a supplement record or treat a shared botanical as permission to substitute. A clear separation can end the shopping comparison before a purchase, which is useful when the original search mixed product classes.
Compare the trade-offs
| Option | Useful when | Purchase limitation |
|---|---|---|
| Named UK THR product | Full medicine leaflet and registration reference | Preserve exact product and revision date |
| Traditional-use framework | Attribute the MHRA scheme correctly | Do not rewrite it as proof of every clinical claim |
| US botanical supplement | Its own local label and classification | Shared plant wording does not establish interchangeability |
Your purchase checklist
- Keep the exact THR product and leaflet together.
- Distinguish traditional-use evidence from clinical-effect claims.
- Do not generalize UK registration to the entire EU.
Sources and further reading
- Kalms: Day patient leaflet with THR reference and holder
- MHRA: traditional herbal registration application framework
- UK government: Herbal Medicines Advisory Committee and traditional-use evidence
- FDA: US dietary-supplement category context
Reference links concern the stated topic or example. They do not indicate endorsement of this publication. Product versions, local labels, availability and seller terms can change; verify the exact listing before ordering.