Although there are many different types of pills, patches, implants and injections, in the final analysis there are only three estrogens:
E1 Estrone
E2 Estradiol
E3 Estriol
Estradiol is about 10 times as potent at Estrone, Estriol is even weaker and is only produced during pregnancy.
Pure Estradiol is what you would be interested in and it is very inexpensive, since no one can patent it. Walmart, for example sells estradiol tablets as part of their $4 / 30 days, or $10 / 90 days generic program.
Oestrogel is pure estradiol in an alcohol gel base. Estradiol Valerate and Cypionate are timed-release injectable forms of pure Estradiol. Over time they degrade from the "ester" to form estradiol.
Substances like Premarin and Ethynl Estradiol are artifical mimics of estradiol. Premarin was used in the Women's Health Initiative study which was discontinued due to adverse side effects. I feel that if they had used pure estradiol the outcome would have been very different.
Randi
Quote from: paxi1334 on November 29, 2013, 01:44:07 PM
by any chance, does the type of the estrogen involved have to do with whether or not it is neuro-protective as opposed to actually causing certain problems?