is the main estrogen
produced from the ovaries. It is an 18 carbon chain. Sometimes another substance is attached to the "alkyl" group at carbon 3 to allow for different forms of administering the estrogen
such as injectable versus
oral. The valerate that I'm familiar with is an injectable estrogen
. That would make it last longer than "normal" estradiol
. But estrogen
. In comparable dosages, the effects and risks and benefits would be the same.