Who was studied?
Results from animals or people with a specific disease may not apply to healthy adults.
What was measured?
A biomarker is not the same as memory, physical function or disease risk.
Which intervention?
Oral precursors, injections and IV infusions cannot be treated as interchangeable.
How durable was the finding?
Was the result sustained, randomized and compared with an appropriate control?
Who benefits from the claim?
Watch for marketing pages presenting early-stage findings as settled clinical results.
What to do next
Write down your clinical question and compare the full terms from more than one source. Confirm professional licensing, specific product, pharmacy, fees and appropriate follow-up. If something is unclear, ask before paying.
Example: put these questions to work
Suppose a headline says “NAD levels rose by 50%.” Before interpreting that number, look for the assay, timing, comparison group, number of participants and whether there was any meaningful change in symptoms or function. Ask if the study was funded by someone who sells the product. The presence of a precise percentage can create a false sense of clinical certainty when the research examined only a laboratory marker.
A worksheet for your own notes
Use the headings from this guide as questions to take to a qualified professional or provider. Write down what you were told and when; do not rely on a screenshot without a date. If the explanation changes between an advertisement and a checkout screen, ask the company to reconcile it before payment. Keep a separate column for things that have not been confirmed.
- Who was studied?: Ask which documents, evidence, costs or clinical decisions would let you answer this point confidently.
- What was measured?: Ask which documents, evidence, costs or clinical decisions would let you answer this point confidently.
- Which intervention?: Ask which documents, evidence, costs or clinical decisions would let you answer this point confidently.
- How durable was the finding?: Ask which documents, evidence, costs or clinical decisions would let you answer this point confidently.
For a fair comparison, collect answers from at least two sources that are actually suitable for your location and clinical question. Document the pharmacy, prescriber, cancellation policy, clinical follow-up and expected recurring charges wherever medication is involved.
A claim to treat with caution
Be cautious when a commercial program uses precise biomarkers to imply outcomes that its clinical studies did not measure. It is reasonable to stop the process if the information you need is not available. The goal is to make an informed, voluntary decision, not to maximize the number of provider applications.
Provider information to compare
These are paid referral links for additional research, not medical endorsements. We may earn a commission if you choose a service. Confirm the actual terms and eligibility with the provider.