> The toxicity of DNP was known from the beginning of the 20th century. The cataract epidemic came on suddenly in the spring of 1935, probably because of a product with a larger dose. The cataracts caused by DNP appear within a few hours or days of taking the drug, and disappear spontaneously when the drug is stopped, more quickly with [[vitamin C]] supplement. The FDA used the cataract outbreak to get new powers. The production of permanent cataracts by estrogens and glucocorticoids hasn’t led to any action at all by the FDA. [(Reference)](https://archive.ph/o/OJZkW/https://raypeatforum.com/community/threads/ray-peat-email-advice-depository.1035/page-13%23post-164556)