The remark above could be misleading. Sublingual administration does give a higher peak, it's true, but it
also delivers a higher overall dosage than oral. The reasons for this are well documented: oral administration loses a significant proportion compared to sublingual owing to gastric digestion and liver metabolism.
'One very good study (Price) compared the peak and average estradiol in the bloodstream from taking estradiol pills either orally or sublingually. Six women took a variety of doses of estradiol via both methods, and their blood serum estradiol levels were measured at 0, 1, 2, 3, 4, 6, 8, 12, and 24 hours after they took their dose.
The graph is well worth studying:
http://transascity.org/wp-content/uploads/2013/06/Price_Estradiol.jpg'Assuming the 1-mg dose is taken, then in the case of oral administration the product of time and estradiol level is approximately 480 pg/ml*hr. Calculating the area under the sublingual curve is more difficult. I plotted points from the sublingual estradiol curve, and came up with an estimate of the estradiol function from 1 hr to 24 hours as being 350.54*(HOURS^-0.907). From 0 to 1 hours, I estimated the estradiol level linearly, as 451*HOURS. The area under the curve from 0 to 1 hour is therefore 225.5 pg/ml*hr. To find the area under the more complicated curve from 1 to 24 hours, I used a little calculus and integrated, and ended up with a value of 1,296 pg/ml*hr. Summing the two values gives a result of 1,521.5 pg/ml*hr.
For those keeping score, the total estradiol absorbed by your body when taking the same pill sublingually as opposed to orally is about 3.2 times the dose received when taking oral estradiol.'
If you spread the sublingual administration evenly you are overall getting a much more effective reception of estrogen:
http://transascity.org/wp-content/uploads/2013/06/Estradiol_Dose_Comparison.jpgThe full academic paper is here:
http://www.sciencedirect.com/science/article/pii/S0029784496005133and here:
http://www.ncbi.nlm.nih.gov/pubmed/9052581However in order to even out the peaking issue I use two different methods of administration: sublingual and gel.