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Evidence-ranked supplement protocols for PCOS, anxiety, joint pain, and more. Clinical doses with drug interaction checks.

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245+ Evidence-Based Pages
27 Supplement Categories
Cost Per Clinical Dose (Not Per Pill)
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Most supplement sites compare products by price per pill. We compare by cost per clinically-effective dose — the price to take the amount actually studied in clinical trials. A cheap product that underdoses the active ingredient isn't a good deal.

Popular Guides

Best Magnesium Supplement All forms ranked. Best value: $0.24/day. Vitamin D Dosage Guide 42% of adults are deficient. D2 vs D3, K2 pairing, dosing. PCOS Supplements Evidence-ranked protocols for hormonal balance. Supplements for Anxiety GAD-7 reduction of 4.5 points within 2 weeks. Statin CoQ10 Depletion 92M Americans on statins. CoQ10 reduced 16-54%. Can't Sleep? Magnesium glycinate: -17 min sleep onset (P=0.0006).

Free Tools

Supplement Audit Check what you're taking for form, dose, quality, and cost. Supplement Lookup Search 207,000+ verified labels from the NIH DSLD. Stack Builder Custom stack with interaction checks and one-click cart. GLP-1 Calculator Nutrient depletion risk for Ozempic, Wegovy, and Mounjaro.

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Medical disclaimer: This website provides educational health information based on published clinical research. It is not medical advice and does not replace consultation with your physician. Always discuss supplement changes with your doctor, especially if you take medications or have a health condition. Methodology.

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Rankings are determined by cost per effective dose and clinical evidence, not affiliate commissions. Read our methodology.