Is the information clinically validated?

All values are sourced from NIH Office of Dietary Supplements and peer-reviewed nutrition research. RDA values follow the DRI (Dietary Reference Intakes) published by the Institute of Medicine.

Can I look up supplements here?

The encyclopedia covers individual nutrients (vitamins and minerals). For specific supplement formulations, see Supplement Guide in FreeBMIKit.

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Health

Best Free Nutrient Encyclopedia Online in 2026 — All Vitamins and Minerals

Sunil Kalikayi4/7/20264 min read

What the Encyclopedia Covers

Nutrient Encyclopedia covers all 13 essential vitamins and 16 essential minerals with: biological functions, deficiency symptoms, toxicity thresholds, RDA by age and gender, top food sources with amounts, and supplementation guidance.

How to Use It Effectively

Search by nutrient name or browse by category (vitamins, minerals). For each nutrient, read: what it does (function), what happens without it (deficiency), how much you need (RDA), and where to get it (food sources). Use this as your reference when evaluating supplements or dietary changes.

Combining With the Vitamin Deficiency Checker

The encyclopedia provides detailed background knowledge. Vitamin Deficiency Checker helps you self-assess whether your diet and symptoms suggest a specific deficiency. Use both together for the most informed picture.