HRT stands for hormone replacement therapy
In the Estraval Depot Injection the active ingredient is oestradiol valerate, which is a man-made version of the naturally occurring oestradiol. Oestradiol is the main and most powerful form of the female sex hormone estrogen, and it is responsible for improving female sexual traits and controlling the menstrual cycle.
Hormone replacement therapy (HRT) uses these injections to make up for the loss of estrogen production by the ovaries during menopause or after the ovaries have been surgically removed.
transgender treatment
Male-to-female transsexuals can use these injections as part of a program to change their sexual orientation.