Chemical raw materials contain a large number of substances harmful to human body, such as hexavalent chromium and arsenic, which will go deep into the fur during leather processing, even if a large amount of lime and industrial acid are used for washing and reduction, the residues cannot be completely removed. For example, the content of heavy metals (chromium, arsenic, gong, lead, etc.). ) generally exists in a large number of blue alum skins (tanned leather) and cannot be removed by cleaning. As long as the content of heavy metals in gelatin or hollow capsules exceeds 5ppm (five parts per million), it can generally be said that the gelatin raw material of capsules is doped with blue alum skin; Excessive heavy metals will lead to nervous system poisoning, dizziness, insomnia, diarrhea, dermatitis and other symptoms, and it is easy to accumulate in the liver and kidneys.
China Pharmacopoeia stipulates that the raw material gelatin used in the production of medicinal capsules should at least meet the standard of edible gelatin. According to the industry standard of edible gelatin, edible gelatin should use animal skin, bone and so on. As raw materials, it is forbidden to use any industrial waste after tanning in tanneries.