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What does E1+E2 stand for?

E1+E2 stands for estriol/estrone + estradiol: E3


This definition appears rarely

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To date, there is no research indicating whether or not the risks associated with oral CEE are also linked to compounded oral BiEst (estriol + estradiol) and TriEst (estriol + estrone + estradiol.
None of the synthetics, animal source or bio-identical hormones are “natural” – all are highly processed chemicals. Despite what proponents of “natural” hormone enthusiasts tell you, I’ve found that synthetic, animal and bio-identical hormones share most of the same benefits and side effects. Botanical estrogens may be slower to work and not as strong, but are often effective and safer. Furthermore, there are multiple types of human estrogen, but most practitioners don’t test estrogen or test only 1 o2 types. Some of the best studied are estriol, estrone, estradiol.
This is a horse hormone that is labeled as equillin. There are no traces of this hormone equillin in the table of human hormones. The second component in Prempro is called Provera stated progesterone - but its really not human progesterone or progesterone at all. Human estrogen is actually a blend of three different molecules. Estriol, estrone and estradiol.
When discussing estrogen it is important to note that “estrogen” is an umbrella term for many different estrogens including estriol, estrone, and estradiol. All three of these estrogens are produced in the body and have physiological effects. In the past, estriol was believed to have little physiological significance due to its weak estrogenic activity when compared with estrone and estradiol. Nonetheless, research suggests that estriol’s weakness may confer certain beneficial effects in contrast with more potent estrogens.