Notes on various supplements. Also see the nutrition page.
These are "supplements" that have been around for a long time and so can be deemed safe. Note that, traditionally, there has been no real distinction between supplements and food as medicine. A good diet should already provide most necessary minerals, vitamins, amino acids and so on.
Lab-made supplements. The ones listed are probably safe, but proceed with caution.
One of the most important minerals to supplement.
Avoid – see here. Instead, get vitamin C from fruit and liver, not as ascorbic acid or citric acid.
Avoid – supplementation increases calcium, depletes magnesium, potassium and retinol. Instead, get vitamin D from sunlight and seafood, eggs and cod liver (oil).
Avoid - capsules / fish oil easily turns rancid. Instead, get omega-3 (DHA/EPA) from seafood and bivalves, preferably wild caught.
Avoid - all supplements and plant sources of iron have low bioavailability, and thus accumulates in your blood to a greater extent than heme iron. Get your iron from meat instead. Also see the section about iron in the modern dangers page.