The Supplement Checklist I Use Before Every Purchase

Before every supplement purchase, I use the same checklist. It is not complicated — but it stops me from buying products that are not worth the money, or that are not safe for me. The supplement checklist I use before every purchase is here.

Check one: the question. What am I trying to do? Correct a deficiency? Fill a gap in my diet? Support a specific health goal? A supplement that corrects a deficiency works — for people who are deficient. Check whether you are deficient — before you buy a supplement to correct it. Ask your doctor whether a test is worth doing.

Check two: the label. The front of the bottle is marketing — the back is the product. Check the ingredients, the doses, the form, the warnings. An ingredient studied at 500 mg a day, present at 50 mg in the product, is not evidence for the product — it is evidence for a different dose. Check the dose — and check it against the research.

Check three: the certificate. Does the brand test every batch — and publish every certificate? A brand that tests, and publishes, is giving you something verifiable. A brand that does not is asking you to trust it — without evidence. Check the certificate — batch, date, testing. If there is no certificate, there is no proof — only a claim.

Check four: the study. Does the review cite a study of the same ingredient, the same form, the same dose, in a comparable population, measuring a clinical outcome? A review that cites a study of a different dose, in a different form, in a different population, is a review without evidence. Check the study — not the citation count.

Check five: the doctor. Some supplements interact with medicines; some affect blood tests; some are unsafe for people with certain conditions. A five-minute conversation, with a complete list in front of you, is worth far more than a difficult conversation afterwards. Tell your doctor what you take — and ask whether the dose is right for you.

Check six: the baseline. Before you start, write down how you feel — in a sentence, with a date. A baseline is the only way to judge whether a product has worked. Set a review date — six weeks, eight weeks, twelve weeks — and decide, on that date, whether to continue.

Check seven: the record. Write down the product name, the brand, the dose, the batch number, the date you started, and your baseline. A record is five minutes to set up, and a minute a week to maintain. If a recall is issued, the batch number tells you whether you are affected. If a side effect appears, the batch number helps the brand and the regulator identify the problem.

Check eight: the price per dose. A bottle that lasts a month, at the studied dose, is better value than a bottle that lasts three months, at a quarter of the dose. A product that is expensive, at a low dose, with no testing, is poor value — however good the marketing. Check the price per dose — and compare products on that basis.

Eight checks — question, label, certificate, study, doctor, baseline, record, price per dose. Eight checks — and the evidence, not the marketing, decides.

Independent reviews can help you use the checklist. Thesupplementrating.com publishes evidence-led reviews that start with the label, check doses against research, examine testing disclosure and state their limits plainly — and its safety checklist covers the five checks that matter most before you buy. A botanical eye-health review shows the method in practice: label first, dose second, evidence third, verdict last.

The supplement checklist I use before every purchase is eight checks. Question, label, certificate, study, doctor, baseline, record, price per dose. Let the evidence, not the marketing, decide.