Product Lookup connects two things that are normally kept far apart: the actual label of a real supplement product, and the clinical evidence behind what's in it. Here's exactly what it does, where its data comes from, and how to get the most out of it.
Product Lookup is not a database we built or maintain. When you search for a product, the search runs live against the NIH Office of Dietary Supplements' Dietary Supplement Label Database (DSLD) — a free, public, government-run database of over 200,000 real supplement product labels. Whatever the manufacturer put on the actual label — ingredients, doses, brand, UPC — is what gets retrieved.
We keep it this way on purpose. Rather than us maintaining our own product database (something that would inevitably go stale, be incomplete, or introduce our own transcription errors), the NIH remains the source of truth for what's in the bottle. Our job is what comes next: connecting that label to the actual evidence.
1. Search by product name. Type a real product's name — brand and product both help narrow results (e.g., "Nature Made Vitamin D3" rather than just "Vitamin D"). Results appear as you type.
2. Select the matching product. Click it to pull the full label — every declared ingredient and its exact dose, straight from the NIH record.
3. Click "Investigate the Evidence." This is where Product Lookup goes beyond the label. It builds a research prompt containing this exact product's ingredients and doses, combined with a standardized evidence-evaluation methodology — the same rigor this site's own books and guides use throughout.
4. Choose how you want to run it. Pick Claude, ChatGPT, or Perplexity for a one-click analysis using your own account, or copy the full prompt to paste into any AI tool you prefer.
5. Read the analysis — and check its sources. The response should lead with an overall verdict, then walk through each ingredient's evidence, dose comparison, and safety profile. Treat the citations as your starting point for verification, not the final word.
Every option runs the identical evidence methodology — only the destination changes:
Analyze with Claude, ChatGPT, or Perplexity — opens a fresh conversation with the research prompt already loaded, using your own account and your own AI usage allowance. This site does not pay for, log, or see your analysis, and never sends your query through an API we control.
Copy Full Research Prompt — copies the complete, unabbreviated methodology and product data to your clipboard, for pasting into Gemini, any other AI assistant, or a tool we haven't listed. This option exists so the site never locks you into one AI provider.
The prompt behind every option asks the AI to evaluate the exact product and dose you looked up — not the ingredient in the abstract. Specifically, it asks the AI to:
Prioritize systematic reviews and randomized controlled trials over observational data, mechanism-only reasoning, or anecdote; compare this product's actual dose against the doses used in the relevant clinical trials; identify established adverse effects, drug interactions, and contraindications; distinguish evidence for correcting a real deficiency from evidence for supplementation in people who aren't deficient; rate the strength of evidence for each major use (Strong / Moderate / Limited / No Benefit / Harm) with a stated reason; and cite its principal sources with publication dates.
This is the same standard applied throughout this site's Top 25 ranking and all three books — it doesn't relax just because the product wasn't one we'd already written about.
NIH label data is manufacturer-reported and voluntary. The NIH itself notes that submitted labels "might be incomplete and/or inaccurate." A product's presence in the database is not an endorsement of that product by NIH, FDA, or HHS — it's simply a record of what a label says.
The AI is a research assistant, not an authority. Treat its analysis as a well-structured starting point, not a verdict to accept uncritically. Verify anything important — especially safety or interaction concerns — against the cited primary sources, and against a pharmacist or physician who knows your specific health situation.
This tool doesn't replace medical advice. It's built to help you ask better questions of your doctor or pharmacist, not to substitute for the conversation.