Oh and re preventing pregnancy, think of it this way...since we know that blood being too "thick" can prevent implantation, doesn't it simply stand to reason that blood being too thin could also be a problem?? It just seems to be common sense to me that neither extreme is good! And while I don't have a study to prove that yet, I don't like waiting around till someone figures out what I have already observed - people taking lots of blood thinners, whether it's fish oil in IVF rounds, aspirin, or people taking herbs to "aid implantation" - end up having lots of issues in pregnancy with SCH and early losses that are otherwise unexplained.