(16-12-2014, 15:41)isobasic Wrote: I've always taken it for granted that the body's production of female hormones is completely shut down when taking the combined birth control pill. I know endogenous oestrogen can still be released from fat stores, and the adrenal glands produce testosterone...but the ovaries are shut down, right? or is there just a constant low level being produced that doesn't fluctuate in a way that would cause ovulation? Hope someone can set me straight on this as it means a lot for what is or isn't worthwhile trying for nbe while taking the pill.
Pretty much, unless you count the 7 days off, in that case it's entirely possible. I'd make sure you supplement with vitamin C while on bcp, which will increase E2. But don't forget that the breasts and the liver also produce estrogen (albeit secondary sources), estradiol is produced from testosterone via the P450 enzyme.
Estrogens are produced primarily by developing follicles in the ovaries, the corpus luteum, and the placenta. Luteinizing hormone (LH) stimulates the production of estrogen in the ovaries. Some estrogens are also produced in smaller amounts by other tissues such as the liver, adrenal glands, and the breasts. These secondary sources of estrogens are especially important in postmenopausal women. Fat cells also produce estrogen, potentially the reason why being underweight or overweight are risk factors for infertility.
In females, synthesis of estrogens starts in theca interna cells in the ovary, by the synthesis of androstenedione from cholesterol. Androstenedione is a substance of moderate androgenic activity. This compound crosses the basal membrane into the surrounding grandulose cells, where it is converted to oestrone or oestradiol, either immediately or through testosterone. The conversion of testosterone to oestradiol, and of androstenedione to oestrone, is catalyzed by the enzyme aromatase.
https://eaware.org/ovaries/