I am attaching one of the few articles relevant to the matter, called Breast size in relation to endogenous hormone levels. If you can get through the whole thing and half-way understand it, you're doing better than I am!
Thanks for sharing!!!
This article shows why it's critical to be in touch with one's cycles if you want NBE to work. The critical days 5-10 and 18-23 mentioned in the article showed the most growth among those on the pill. For those of us who are not on the pill, these are times we want to exploit! These peak days do change, depending on the length of one's cycle, however! The key to learning the cycle is to take your temperature using a basal body thermometer every morning at the same time and chart these shifts, at least to collect some baseline data. There are programs and apps that are out there that will use predictive analytics over time to give a good sense of when ovulation will hit.
Let's look at some of the article's findings:
"One was that IGF-1 was the strongest determinant of breast size during the follicular phase among never and former users of oral contraceptives." I am having fine results as is, but if I ever had any issues with this, I'd take the supplement L-arginine to help.
"Prolactin levels were also associated with larger breast sizes among non- users in the follicular phase." Goat's rue has a direct, though gentle, effect on prolactin levels.
"During the luteal phase, women with high 17B-estradiol and progesterone levels had larger breast sizes." Licorice root (which I just added to my program with excellent results), can help raise B-estroidiol.
"Higher testosterone levels in the luteal phase were related to smaller breast sizes, and this is in line with androgens' suppressing mammary growth." Hence the importance of an anti-androgen/pro-aromatase like peony.
The unfortunate side of things is that there will be some shrinkage once the cycle ends. In my case, last cycle, I lost about .5", but I had a net gain of .6" despite that loss. So far in this cycle, I have already exceeded my peak measurement from last cycle by 3/8th of an inch and that measurement was taken a couple days ago (day 18 of the cycle).