Supply: The primary ore of germanium is germanite, which can be about 7% germanium. Commercially, germanium is received as a byproduct of metal refining and from some coal ashes.Nghiên c?u c?a FDA ??a ra k?t lu?n r?ng germani, khi s? ??ng nh? là ch?t b? sung dinh d??ng, "th? hi?n m?t s? nguy hi?m ti?m tàng cho s?c kh?e con ng??i".[6]However, lot