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日本研究者K.Asai提出,食物和其它生物物质中锗的含量自0.1至1ppm,相当于每克食物含锗0.1～1μg。有些药用植物含大量锗。他测定过的一些药用植物的含锗量是(ppm);
Japanese researcher K.Asai proposed that the content of germanium in food and other biological materials should be from 0.1 to 1 ppm, which is equivalent to 0.1 to 1 μg of germanium per gram of food. Some medicinal plants contain a lot of germanium. He measured the amount of germanium in some medicinal plants (ppm);