Nutrients
What each nutrient does, how much you need and where to get it.
4 pages
Calcium
How much calcium adults need, where to get it without dairy, and why vitamin D is part of the answer.
Iron
How much iron adults need, why plant sources absorb differently, and why supplements need a test first.
Omega-3 Fats
What omega-3 fats do, how much seafood is advised, and where the supplement evidence actually sits.
Vitamin D
What vitamin D does, how much adults need in the US, and who is most likely to fall short.