How do I know if my supplements are good quality UK?

Seven signals ranked by how hard each is to fake: the certificate nothing can fake, the audited facility, the logo in a database, and the label the regulations write

How do I know if my supplements are good quality in the UK is a question a buyer answers by reading signals off a tub, and the only question that matters about a signal is whether a bad product could send it, so this guide ranks the seven signals a tub gives off in order of how hard each is to fake and tells a buyer to read them from the top. Signal one, the hardest to fake, is a certificate of analysis for the batch number printed on the tub, issued by a laboratory that appears on the national accreditation body's register for the laboratory standard, listing the analytes the category is exposed on, heavy metals for a mineral or a mushroom, identity and purity for creatine, the amino acid profile for a protein, with results against stated limits and a date after encapsulation. A bad product cannot send this signal: a laboratory on the register has been audited for the competence of its methods and the honesty of its reporting, the batch number ties the document to the tub, and a brand that forges one has committed a different kind of offence from selling a weak capsule. The signal is obtained by one message quoting the batch number and is either in the reply within a working day or it is not. Signal two is the facility standard, GMP or BRC, stated on the label or confirmed on request: it attests to the process rather than the product, that the facility is audited for hygiene, traceability, cleaning between runs and record keeping, and it is hard to fake because the audit is by a third party and the certificate is checkable with the scheme, but it is a signal about where the tub was made rather than what is in it, which is why it ranks below the certificate.

Signal three is the certification programme logo, the banned-substance programmes above all, which attests that a batch of the product was tested for the substances on the prohibited list and is hard to fake because the logo is checked against the programme's public database by lot number; it ranks third because it tests for one category of risk and says nothing about dose, metals or identity, and because the logo on a range's marketing can be present when the lot number in hand is absent from the database. Signal four is the label's mandatory particulars, which the food supplements regulations require on every tub: the words food supplement, the names of the categories of nutrients or substances, the portion recommended for daily consumption, a warning not to exceed it, a statement that supplements should not replace a varied diet, a keep-out-of-reach-of-children statement, and the amounts per portion, alongside the operator's name and address under general labelling law. A label with all seven is a label that someone who knew the regulations wrote, and a label missing any is a careless one, which is a signal about the company's attention rather than the tub's contents, hard to fake only in the sense that a company that does not know the regulations does not know what to fake. Four signals from the top, each one a thing a bad product finds difficult, and a buyer who finds the first has an answer and need not read further.

The three signals a bad product sends easily, why the shelf is read from the wrong end, the worked example's seven signals in order, and the honest answer

The three signals at the bottom of the ranking are the ones a bad product sends as easily as a good one, and they are the ones the shelf is built to make a buyer read first. Signal five is the brand's own statements: premium, pharmaceutical grade, lab tested, clinically dosed, clean, pure, each of which costs nothing to print, none of which is a regulated term, and all of which are present on the worst tubs in the category in larger type than on the best; a statement is a reason to ask for the document that would make it true and is not the document. Signal six is the reviews: the average, the count and the wall of five stars, which can be bought, incentivised, clustered by a launch campaign or generated, and which even when honest describe how a product felt rather than what it contained, since no reviewer has run a mass spectrometer on their tub; the pattern of reviews sorted by date tells more than the average, and the brand's replies to the one-star ones tell more than the pattern, but the signal sits sixth because a bad product can have excellent reviews for years. Signal seven, the easiest to fake, is the packaging and the price: a heavy matte tub, an embossed label, a foil seal, a minimalist typeface and a price three times the category's, which signal that a brand has spent money on the signal and nothing else, and which a bad product can send perfectly. The shelf is designed to be read from the bottom of the ranking up, packaging first, price as a proxy for quality, statements in large type, reviews as the clincher, and a buyer who reads it that way has been told by the packaging what the certificate would have told them if they had asked for it, which is often something different.

The worked example's seven signals are laid out in the same order, because the method must run on the house. {FL}: signal one, a certificate of analysis for the batch number on the tub, testing for lead, mercury, arsenic and cadmium, sent on request; signal two, UK made under GMP and BRC, stated; signal three, no banned-substance programme logo, and the listing says so rather than implying it, so a tested athlete knows where it stands; signal four, every mandatory particular present, the words food supplement, the nutrient category, two capsules a day, the warnings and statements, 300mg elemental magnesium at 80% NRV per portion, and the operator's UK address; signal five, four authorised magnesium claims and no statements beyond them; signal six, reviews for the reader to sort by date on the day, since the house cannot award itself this one; signal seven, a plain tub at 22p a day for 180 capsules, which is the commodity price for the elemental milligrams and signals nothing, which is the point. The honest answer to how a buyer knows their supplements are good quality in the UK is that good quality is a certificate in one hand for the tub in the other, from a laboratory on the register, for the batch on the label, testing for the thing the category is exposed on; that the audited facility, the database-checked logo and the complete label are the next best things and each a reason to ask for the first; and that everything below them on the ranking, the statements, the reviews, the packaging and the price, is what a bad product sends as easily as a good one and what the shelf would prefer a buyer to read instead.

What to check on the label

Questions people also ask

How can I tell if a supplement is good quality?

By reading the signals a tub gives off in order of how hard each is to fake and stopping at the first one present: a certificate of analysis for the batch number on the tub from a laboratory on the national accreditation register, testing for the analytes the category is exposed on; then an audited facility standard, GMP or BRC; then a certification programme logo checked by lot number in its database; then a label carrying every mandatory particular the regulations require; and only after those the brand's statements, the reviews, the packaging and the price, which a bad product sends as easily as a good one.

What should be on a UK supplement label by law?

Under the food supplements regulations, the words food supplement, the names of the categories of nutrients or substances that characterise the product, the portion recommended for daily consumption, a warning not to exceed it, a statement that food supplements should not be used as a substitute for a varied diet, a statement that the product should be kept out of the reach of young children, and the amounts of nutrients per portion, alongside the operator's name and address, an ingredient list, a batch code and a best-before date under general labelling law; a label missing any of these was written by someone who did not know the regulations.

Are NOW supplements good quality?

A large international brand is judged by the same seven signals as any brand, read from the top: the certificate for the batch number on the tub, the facility standard, any programme logo checked in its database, and the label's mandatory particulars, which for an imported product means checking that a UK-compliant label with a UK responsible address has been applied rather than the original market's label alone; on a marketplace the extra question is the listing rather than the brand, whether the seller is the brand's authorised UK route or a grey importer, since the same brand's tub can arrive through either, and the grey-import audit on the marketplace legitimacy page covers it.

Can I trust supplement reviews?

Only as a sixth-ranked signal: reviews describe how a product felt rather than what it contained, since no reviewer has analysed their tub, and the average, the count and a wall of five stars can be bought, incentivised, clustered by a launch campaign or generated; what tells more is the pattern of reviews sorted by date, where a steady accumulation reads differently from a cluster in one week, and the brand's replies to the one-star reviews, where a request for the batch number shows a quality system operating in public; a bad product can carry excellent reviews for years, which is why the certificate ranks first and the reviews sixth.

Does expensive mean better quality in supplements?

No; packaging and price are the easiest signals to fake and rank last, since a heavy matte tub, an embossed label, a foil seal and a price three times the category's signal only that money was spent on the signal, and a bad product can send them perfectly; the commodity price for the elemental milligrams or grams of active is public and low, and a tub at that price with a certificate for its batch, an audited facility and a complete label has sent the four hard signals and none of the easy ones, which is the shape a good product usually has.

Sources

1. The UK Accreditation Service: UKAS accredits testing laboratories to ISO 17025 for defined scopes and publishes a searchable directory of accredited organisations and their schedules of accreditation. https://www.ukas.com/find-an-organisation/
2. The supplement manufacturing standards: Good Manufacturing Practice, the BRCGS Global Standard for Food Safety and ISO 22000 are the facility-level certifications a contract manufacturer holds and a brand may cite. https://www.brcgs.com/our-standards/food-safety/
3. The Food Supplements Regulations' mandatory label particulars: the words food supplement, the names of the categories of nutrients or substances, the portion recommended for daily consumption, a warning not to exceed it, a statement that supplements should not replace a varied diet, a keep-out-of-reach-of-children statement, and the amounts per portion. https://www.legislation.gov.uk/uksi/2003/1387/regulation/7/made
4. The Informed programmes' operator: Informed Sport and Informed Choice are run by LGC, an accredited laboratory group whose sports-supplement testing operates under ISO 17025 laboratory accreditation, with certified products and batches published on a public database. https://sport.wetestyoutrust.com/about

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