In discussion of these posts with my chemist / pharmacy student son, it
seems unlikely that soy lecithin would have any significant estrogenic
activity.
Soy lecithin capsules should contain mostly fatty acids, triglycerides, and
phospholipids; none of which are known to be estrogenic.  Soy lecithin
contains very small amounts of isoflavones (the estrogenic component of
soy), but not enough to have any clinically significant estrogenic effect.
For example, the USDA lists the total isoflavone content of soy lecithin as
15.7 mg/100g
(see p. 24 of link:
https://www.ars.usda.gov/SP2UserFiles/Place/12354500/Data/isoflav/Isoflav_R2.pdf).

 A person taking 1.2 g QID would get only  75 ug of isoflavones a day.  By
comparison, a 120 g serving of tofu (see p. 29 of the same isoflavone
database) has 37 mg of isoflavones, or ~500 times the isoflavone content of
the patient's current soy lecithin regimen.  Note that the exact
composition of lecithin supplements is not regulated, and may contain
varying amounts of isoflavones.

So soy lecithin was probably not the cause of the spotting nor a
significant estrogenic cancer risk, but as other posters have mentioned egg
lecithin or sunflower lecithin should work just as well as soy lecithin.
Just note that egg and sunflower products also have trace amounts of
isoflavones...

Helen Hoctor, BS, RN, CLS  on the bay in Lewes , DE

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