Run every supplement through these seven questions and you will avoid the vast majority of bad purchases.
Key takeaways
- Base the decision on your diet, lifestyle or test results — not influencer hype.
- Look for doses near the Daily Value or within studied ranges — not mega-doses.
- Insist on a named third-party seal (USP, NSF, Informed-Choice), not a vague “lab tested” claim.
- If a product fails two or more of these questions, skip it.
Who this is for
Anyone about to spend money on a supplement who wants a quick reality check first.
- Do I actually need it? Base the decision on your diet, lifestyle or test results — not influencer hype.
- Is the dose sensible? Look for doses near the Daily Value or within studied ranges — not mega-doses.
- Is it third-party tested? A named seal (USP, NSF, Informed-Choice) on the label, not a vague “lab tested” claim.
- What is the exact form? Glycinate versus oxide, D3 versus D2 — the form changes absorption and effects.
- Could it interact with my medication or conditions? When in doubt, ask your pharmacist — this is what they are for.
- What is the real cost per day? Do the serving maths; the cheapest bottle is often the most expensive habit.
- What is the return policy? Reputable brands stand behind their products.
If a product fails two or more of these questions, skip it.
Your next step
Learn how to read a supplement label like a pro.
Related reading: our complete beginner’s guide to supplements.
Written by the Nourish & Glow editorial team · Published 21 September 2026 · Last reviewed 21 September 2026
General information only — not medical advice. If you have a health condition, take medication, or are pregnant or breastfeeding, speak to a qualified professional before using supplements.
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