Vitamin A: Food Sources, Deficiency, and Safe Limits
How much vitamin A a tablespoon of liver, cod liver oil or sweet potato actually carries — what deficiency does, and why the 3,000 microgram upper limit matters.
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How Nutrients Are Classified — and What the Reference Numbers Mean
Macronutrients, micronutrients and the thirteen vitamins — plus what EAR, RDA, AI and UL actually mean, and why an intake below the RDA is not a deficiency.
