How We Evaluate Supplements at Supplement Skeptic

Every Supplement Skeptic review follows the same path: we read the formula before the marketing, check each dose against the human studies, weigh the price and refund terms, and only then write a verdict. A product earns a positive frame only when the evidence, the dosing, the price, and the claims all line up.

Two people write these reviews. I cover the practical and buyer-facing categories; Dr. Rhett Calder, a retired internist, covers men’s health and the more clinical topics. Different voices, one method. Here is exactly how it works.

We read the label before the sales page

This is the rule that shapes everything else. The Supplement Facts panel is the only part of a product that has to tell the truth in a regulated format. The sales page is where the story lives. So we start with the panel — the ingredients, the per-serving doses, the serving size — and form a first impression before a single headline has a chance to influence it.

We check the dose against the studies

For each hero ingredient, we ask one question: does the dose here match the dose used in the human studies that found an effect? We compare against references like the NIH Office of Dietary Supplements fact sheets and the published trials themselves. An ingredient at its studied dose is meaningful. The same ingredient at a tenth of that dose is a name on a label.

This is where proprietary blends fail immediately. If the panel hides per-ingredient amounts behind a single blend weight, we cannot verify the dose — and a formula we cannot verify cannot earn our confidence.

We weigh price the way a buyer actually pays

Supplements are bought monthly, often for half a year, so the bottle price is the wrong number. We calculate price-per-day and project the real cost of a meaningful trial period. We also read the refund policy before recommending anything, because a “60-day guarantee” only matters if it covers opened bottles. The Federal Trade Commission flags subscription traps and misleading guarantees as common problems, so we read the checkout terms as carefully as the formula.

We hold claims to the rules

A dietary supplement cannot legally claim to cure, treat, or prevent disease. We use structure/function language and expect honest products to do the same. When a page promises to reverse or cure a condition, we note it as a compliance and trust failure, regardless of how good the ingredients are. The Mayo Clinic guidance on evaluating supplements reflects the same caution we apply.

The verdict scale

Each review lands on a 0–10 rating and one of four verdicts:

• Recommend — evidence, dose transparency, price, and claims all hold up.
• Conditional — a reasonable buy for a specific person or use, with a stated caveat.
• Skeptical — not a fraud, but the dose math or the marketing pulls the wrong way, and there is usually a better-value alternative.
• Avoid — enough red flags on the formula and the page that we would steer you elsewhere.

The verdict is a buying decision, not a vibe. If one of the four pillars breaks, the verdict says where.

What we do not do

We do not take the sales page’s word for an effect. We do not rescue a weak product with “results not typical” fine print. And we do not let a long ingredient list stand in for a properly dosed one. A single ingredient at its studied dose beats twenty sprinkled across a blend every time.

Safety always comes first

When an ingredient interacts with common prescriptions — as many glucose, blood-pressure, and blood-thinning-adjacent botanicals do — we say so plainly and point you to your clinician. No review here is a substitute for medical advice. The goal is to help you spend money well and avoid harm, not to replace your doctor.

You can see the method in action across the site. We applied it to Sugar Defender in blood sugar, Joint Genesis in mobility, Critical T in men’s health, and ProDentim in dental care — and the ranked fields live in our roundups, starting with blood-sugar support.