A supplement that does not work is a common experience — and a frustrating one. You take a product for weeks, or months, and feel no different. What should you do? Here is what to do when a supplement does not work.

The first step is to check the baseline. Before you started, did you write down how you felt — in a sentence, with a date? A baseline is the only way to judge whether a product has worked. Without a baseline, you cannot tell whether you feel better, worse, or the same. If you did not set a baseline, set one now — and judge the product from here.

The second step is to check the dose. Did you take the product at the studied dose — or at a lower dose? A product that contains an ingredient at 50 mg, studied at 500 mg, is not evidence for the product — it is evidence for a different dose. Check the dose against the research — and check whether you took it as directed.

The third step is to check the time. Did you take the product for long enough? A study that tested an ingredient for twelve weeks did not test it for two weeks. A product that needs eight weeks will not work in two. Check the time — and set a review date, before you decide.

The fourth step is to check the form. Did you take the product in the form that was studied — or in a different form? An ingredient studied as a powder, present as a tablet, is not the same — the form affects absorption. Check the form, and the evidence for it.

The fifth step is to check the deficiency. Did you take a supplement to correct a deficiency — or did you take it without one? A supplement that corrects a deficiency works — for people who are deficient. A supplement that corrects a deficiency, taken by someone who is not deficient, does nothing — because there is nothing to correct. Check whether you were deficient — before you decide the product did not work.

The sixth step is to check the interactions. Were you taking a medicine, or another supplement, that affects absorption — or that interacts with the product? Some supplements interact with medicines; some affect blood tests; some are unsafe for people with certain conditions. Check the interactions — and talk to your doctor, if you are unsure.

The seventh step is to check the brand. Did the brand test every batch — and publish every certificate? A product that is not tested may be weaker than the label says — or may not contain what it claims. A product that is tested, and the certificate is published, is a product you can verify. Check the certificate — and check the batch number.

If the product still does not work, after a fair trial — at the studied dose, in the studied form, for long enough, with a baseline, and no interactions — then stop taking it. A product that does not work, after a fair trial, should be stopped — not swapped for another product that makes the same promise. Stopping is not failure — it is a decision, based on evidence.

When you stop, tell your doctor — especially if you are taking prescription medicines, or managing a medical condition. A doctor can help you decide whether to try a different approach — or whether the supplement was never needed. A five-minute conversation, with a complete list in front of you, is worth far more than a difficult conversation afterwards.

Keep a record of what you tried. Write down the product name, the brand, the dose, the batch number, the date you started, and the date you stopped — and why. 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.

Independent reviews can help you decide whether a supplement is worth trying — and when to stop. 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 memory formula review shows the method in practice: label first, dose second, evidence third, verdict last.

A supplement that does not work is not a reason to try another product that makes the same promise. It is a reason to check — the baseline, the dose, the time, the form, the deficiency, the interactions and the brand — and then to stop, if the evidence says stop. Let the evidence, not the marketing, decide.