There are “alternative medicine” sources that describe using vitamin C to induce abortion. None of them seem more than anecdotal “I’ve taken megadoses of vitamin C ten times and I’ve never gotten pregnant!” A quick search of medical literature doesn’t show anything of importance and obstetricians don’t warn their patients about vit. C.
I’ve looked at the literature on Plan B and its proponents make claims for both prevention of implantation and for no such thing but there is nothing definitive - I wish there were.
My own thought is that it shouldn’t prevent implantation by making the uterine lining inhospitable, because progesterone naturally rises after ovulation in any case.
Good points.
I’ve read quite a bit about ascorbic acid in high doses being used to attempt abortion. All anecdotal since I don’t know anyone personally who has done this, nor would I want to. I think it’s more of an herbalists drug of choice, along with black cohosh and a few others.