Aromatase inhibitors are used to limit the amount of Testosterone being converted to Estrogen. The way Als (aromatase inhibitors) work is by blocking the conversion of androgens to estrogen in the adrenal glands, skin, muscle, and tissue, blocking this pathway suppresses estrogen. In young men going through puberty this can help the epiphyses (growth plates) to stay open for longer by limiting estrogen which causes the epiphyses to close, thus adding a possible few extra inches to height as well as an increase in testosterone because of it not being converted to estrogen. In women Als may be used to induce ovulation if struggling to become pregnant, but it also can be used to help treat certain forms of breast cancer specifically hormone receptor-positive breast cancer. There are risks of taking Als but only if you exceed the amount you are taking or dose too often (although there is no risk of overdose), without enough estrogen in your body it will cause bone loss, other side effects which rarely occur (less than 1 in 10,000 patients) could cause blisters or ulcers, liver dysfunction, allergic reactions.