Walk into a Boots, and the shelves do something quietly confusing. Supplements sit beside over-the-counter medicines, often in the same colour palette, often with similar promises in the marketing copy. To a shopper they can blur into one category: "things you take." To UK law, they are two completely separate things, regulated under different statutes, by different authorities, with different rules on what they can claim to do.
The difference matters more than it looks. It's the reason a vitamin C supplement and a cold and flu medicine — both involving vitamin C — can sit on the same shelf using radically different language to describe themselves.
Two categories, by law
In UK law, food supplements and medicines are distinct legal categories. A product is one or the other; it cannot be both.
A food supplement is a foodstuff intended to supplement the normal diet. It contains a concentrated source of nutrients or other substances with a nutritional or physiological effect, in measured doses — capsules, tablets, drops, sachets. It is regulated as food.
A medicine is a product intended to treat, prevent, cure, or diagnose a disease, or to restore, correct, or modify a physiological function. It is regulated as a medicinal product.
The distinction is about what the product is intended to do, and what it can claim. The same substance can sit in either category at different doses and presentations, depending on how it's positioned.
Who's in charge of what
Food supplements live under food law:
- The Food Standards Agency at a national level.
- Local authority Trading Standards and Environmental Health for enforcement at premises and retail.
- The Food Supplements (England) Regulations 2003 and equivalents in Wales, Scotland, and Northern Ireland.
- Retained EU food law, including the Food Information to Consumers Regulation for labelling.
- The Great Britain Nutrition and Health Claims Register for the health claims that can be used.
Advertising for food supplements falls to the ASA and the CAP code.
Medicines live under a different framework:
- The Medicines and Healthcare products Regulatory Agency (MHRA) is the regulator.
- Medicines require a marketing authorisation before they can be sold.
- Manufacturing is subject to medicinal GMP under MHRA inspection — a separate, more prescriptive standard than food GMP.
- Promotional material is governed by the Human Medicines Regulations 2012 and, for prescription medicines, the ABPI Code.
Two systems, side by side, applying to different products.
The claims gap
This is where the distinction becomes most visible to a shopper.
A food supplement can only carry the health claims authorised on the GB Nutrition and Health Claims Register. They are nutrient-function claims — precisely worded statements about what a nutrient contributes to in normal physiology. A food supplement cannot claim to treat, prevent, or cure a disease. Doing so either pushes the product into being an unlicensed medicine, or puts it in breach of the regulations governing food information.
A licensed medicine can carry claims about treating, preventing, or curing a specific condition, but only within the terms of its MHRA marketing authorisation, and only with the clinical evidence to support it.
Bones illustrate the gap neatly. A food supplement containing vitamin D, vitamin K, calcium, and vitamin C can carry each of those nutrients' authorised claims relating to bones in normal physiology — Vitamin D contributes to the maintenance of normal bones, Vitamin K contributes to the maintenance of normal bones, Calcium is needed for the maintenance of normal bones, Vitamin C contributes to normal collagen formation for the normal function of bones. Tied to nutrients, in the language of normal function. It cannot make claims about treating a bone condition; that would put it in the medicines category instead.
A licensed medicine in the bones space — a prescribed treatment for a diagnosed condition — operates in entirely different language, with its own MHRA authorisation and its own clinical evidence behind it. Same body part, different regulatory category, different rules on what can be said.
What sits between
A couple of product categories deserve a mention because they get confused with both:
Traditional Herbal Medicinal Products are herbal preparations registered under the THMP scheme, marketed for minor conditions on the basis of long-standing traditional use rather than clinical trials. They carry a Traditional Herbal Registration mark — "THR" — and they are not food supplements.
Medical devices are non-medicinal products with a defined medical purpose, regulated under medical device regulations. Some products that look like supplements — certain throat lozenges, some gels — are classified as medical devices.
A food supplement is not a THMP, and a THMP is not a food supplement. Each has its own framework for what can appear on the label.
What this means for reading labels
Three practical points:
A food supplement that claims to treat a condition is making a claim outside its regulatory category. That's worth knowing about a brand, regardless of what's in the product.
A medicine's authorised uses are defined by its MHRA marketing authorisation. A food supplement's authorised claims are listed on the GB NHC Register. They are not interchangeable.
Neither category replaces medical advice. A GP, pharmacist, or registered healthcare professional is the right point of contact for questions about a diagnosed condition or about combining a supplement with prescribed medication.
A note on quality claims
Within the food supplement category, descriptions like "GMP-certified facility," "UK-manufactured," and "small batch" aren't health claims, and so they don't appear on the Register. They are factual statements about the product and its production — and they should be substantiable on request. The ASA has acted against brands that have used such phrases without substantiation.
Where Nutriluxe sits
Nutriluxe is a UK food supplement brand. The Vitamin D3 4,000 IU + Vitamin K2 MK-7 with Calcium and Vitamin C is a food supplement, regulated as a food under UK law. The health claims used on its labelling and marketing are limited to those authorised on the Great Britain Nutrition and Health Claims Register — including the authorised bone-relevant claims for the four named nutrients, in their exact authorised wording. Manufactured in the UK to GMP standards, in small batches, with no unnecessary fillers, coatings, or artificial additives.
For advice on any medicine, supplement, or combination of the two, the right point of contact is a GP, pharmacist, or registered healthcare professional.
References
- GOV.UK. Food supplements. Department of Health and Social Care.
- Medicines and Healthcare products Regulatory Agency (MHRA). How we regulate medicines. GOV.UK.
- The Human Medicines Regulations 2012. UK Parliament.
- The Food Supplements (England) Regulations 2003. UK Parliament.
- Great Britain Nutrition and Health Claims Register. Department of Health and Social Care.
- Advertising Standards Authority and Committee of Advertising Practice. CAP Code.
This article is for general information and educational purposes only. It does not constitute medical, nutritional, or professional health advice, and should not replace consultation with a qualified healthcare professional. Always speak to your GP, pharmacist, or a registered healthcare practitioner before starting any supplement, particularly if pregnant, breastfeeding, taking medication, or with an existing medical condition. Food supplements are not intended to diagnose, treat, cure, or prevent any disease, and are not a substitute for a varied and balanced diet and a healthy lifestyle. Do not exceed the recommended daily dose. Keep out of reach of young children. Health claims relate to the named nutrients as authorised on the Great Britain Nutrition and Health Claims Register. Information is accurate at the time of publication; guidance may change. Nutriluxe accepts no liability for any action taken on the basis of this content