Ga – Gallium is found in igneous rocks at 15 ppm; shales as 19 ppm; sandstones at 12 ppm; limestones 4 ppm; fresh water at 0.001 ppm; sea water at 0.00003 ppm; soils at 0.4 to 6.0 ppm to 30.0 ppm; marine plants at 0.5 ppm; land plants at 0.06 ppm; marine animals at 0.5 ppm; land animals at 0.006 ppm.
Gallium was claimed to be essential in1938 and again in1958. Gallium has specific areas of metalloenzymes activity in the human brain and has been reported to specifically reduce the rate of brain cancer in laboratory animals.
British research shows that supplemented diets of pregnant women reduces the rate of brain cancer in children.
1.Spezioli, M, et al.: Gallium Distribution in Human Brain Areas. Biol. Trace Ele. Research. 22:9.1989.
Gallium can bind to the iron transport protein transferrin. Furthermore, differences in serum iron-binding capacity have been suggested as the reason for sex differences in gallium-67 uptake by blood and bone in mice. Radiogallium scanning is a clinically useful procedure for such things as the identification of suspected occult inflammatory foci. Gallium is normally found, albeit in low quantities, in human tissues. Hamilton et al. reported the following concentrations (in micrograms per gram fresh tissue): brain 0.0006 +or- 0.00003, kidney 0.00009 +or- 0.0003, liver 0.0007 +or- 0.0001, lung, 0.005 +or- 0.002, lymph nodes 0.007 +or- 0.002, muscle 0.0003 +or- 0.00004, testis 0.0009 +or-0.0001, and ovary 0.002 +or- 0.0005. Shand et al. found 0.16 mcg gallium per gram of dry fetal liver. Gallium fed at the level of 5 mcg/ml of drinking water for lifetime was slightly toxic to mice. Gallium significantly but not markedly suppressed growth and reduced the life span of females.