Germanium is mostly made from sphalerite zinc ores but is likewise identified to generally be extracted from fly ash coal (created from coal energy crops) plus some copper ores.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? Hello?n m?t s? nguy Hello?m ti?m tàng cho s?c kh?e con ng??i".[6]Cl