They are all organic nutrients that are necessary in small amounts for normal metabolism and good health.

Free radicals are highly reactive molecules produced by cells during normal metabolism.

No matter what we eat, 5-15g is made in our bodies every day during normal metabolism.

In hypothermia, body temperature drops below that required for normal metabolism and bodily functions.

All body functions will race at many times normal metabolism.

Magnesium is needed for the energy-producing steps in normal metabolism.

Both sorts of minerals, like vitamins, are needed by the body for a normal healthy metabolism.

Most of these oxygen-derived species are produced at a low level by normal aerobic metabolism.

Lead also interferes with the normal metabolism of calcium in cells and causes it to build up within them.

It maintained its normal aerobic metabolism, never entering a reduced-oxygen state.