Nutrient Encyclopedia
Complete guide to all 29 vitamins and minerals — RDA tables, top food sources, deficiency symptoms, toxicity risks, absorption tips, and interactions. Search or browse A-Z.
FAQ
Frequently asked questions about nutrient encyclopedia.
What is the difference between vitamins and minerals?
Vitamins are organic compounds made by living things, while minerals are inorganic elements that come from soil and water. Both are essential nutrients, but they play different roles in metabolism, immunity, bones, nerve function, and energy production.
Can I get all nutrients from food alone?
Many people can meet most nutrient needs through a varied diet, but that depends on age, medical conditions, dietary restrictions, and absorption issues. Some nutrients such as vitamin D, B12 for vegans, or iron in certain groups may still need special attention.
What does RDA mean?
RDA stands for Recommended Dietary Allowance. It is the daily intake level that meets the nutrient requirement of nearly all healthy people in a specific life-stage and sex group.
What is the difference between deficiency and toxicity?
Deficiency happens when intake or absorption is too low to support normal function, while toxicity happens when levels become excessive and start causing harm. Both can produce symptoms, which is why dose matters just as much as avoiding deficiency.
Should I take supplements based only on symptoms?
Not ideally. Symptoms can overlap across many deficiencies and unrelated conditions. This guide is useful for education, but lab testing and clinical evaluation are the best way to confirm a true nutrient issue before supplementing aggressively.