I take cinnamon up until ov and then stop because I find it's really good for EWCM, and so after ov, I probably don't need it. Well, actually I take it and stop a couple of days before ov because it delays my ov until after I stop it for some reason. Ov has gone from CD12-13 to CD15-16 since I started taking it. But, someone on here heard from their doctor that more days before ov is better for the maturity of eggs, so maybe it's a good thing that it delays things. I dunno.
But I've heard that the cinnamon can cause miscarriage too, but you have to be taking lots of it, a sprinkle in your food shouldn't hurt.