Hi Sally, I am not sure. There is a good site called hairlosstalk, and a section there for women. You may be able to get some information. I have a lot of hair but I loose a lot due to my Graves and an inflamed itchy scalp. You may want to start with a special shampoo (DHT) blocker, Biotin vitamins, olive oil or Emu oil in hair at night, and a vitamin spray on hair. All of which are organic and good for hair and scalp, if you are worried about toxicity.