Quote from: EllieM on February 28, 2014, 01:08:28 PM
there are also the effects of a better estradiol:estrone ratio in the blood, as well as a reduction in hepatic stress. The reason for this is that the first pass through the liver doesn't happen and more of the estrogen circulates through the entire body before the liver gets it. Since the venous blood from the digestive system passes first through the liver before being recirculated, orally taken meds are pre-processed by the liver before the rest of the body gets it, so there is more stress on the liver and more of the estradiol gets "stepped on".
I agree that with sublingual, more estradiol goes directly into the blood without having to first pass through the liver before reaching circulation BUT
1) with sublingual, there's always the risk of swallowing so that still some estradiol might end up going through the liver
2) sublingual gives a better ratio of estradiol:estrone than oral at first but after a few hours, estrone levels end up surpassing those of estradiol (estrone already starts to rise within 10 minutes of sublingual administration), perhaps due to enzymatic conversion in nearby tissues to mouth (as suspected by authors in a study) and due to the swallowing of estradiol which gets converted to estrone in the liver
3) the issue is not so much liver stress as even high doses of oral bio-identical estradiol (or even ethinyl, premarin as confirmed by Harry Benjamin) don't appear to affect liver function (AST, ALT, etc) but much more, clotting factors that are triggered by estrogen in the liver and increase clotting risk. Even then, if one compares hepatic effects of bio-identicals vs estrogens in birth control pills, one quickly realizes that clotting risks should only be very slightly increased by bio-identical estradiol.
Overall, sublingual is not so much beneficial for health reasons but more for the increased levels of estradiol it yields over time compared to oral. Though quite inconvenient compared to oral (you just swallow it) and more likely to cause PMS due to fluctuations although I've never known anyone complain of this (including me), despite taking pills even twice daily. But, I still like to advise anyone taking it sublingually to take it more frequently, just in case.
I personally prefer sublingual over oral and non-oral over either because it's just a more natural way to get hormones and somehow, I think the body must probably respond better when you mimic nature. Pure speculation though.