It is not silly at all !!!!!! Mercury is heavy metal and accumulates in tissues !!!! That is why big fish have it the most - because they are on the top of food chain. They eat a lot of small fish and accumulate mercury from them little by little until they have so much that they become toxic to eat by humans

Mercury is especially damaging to developing embryo - that is why it is not advised to pregnant women to eat a lot of sword fish and other big ocean fish. Now - on the other side, it is proven that babies whose mothers had fish-oil supplementation during pregnancy had babies with higher IQ - this all are not facts from some "alternative medicine" book but from real medical studies. Was many times on TV and radio. For some reason I am health -news fanatic LOL - always was , even when I was in perfect health - medicine always fascinated me .
Anyway -I am blabbing all of this just so you know that I do not tell stuff "of the top of my head " buddy , I really do research about all that stuff and always check at least 10 sources before making any definite conclusion. You are very smart to wonder about your omega capsules !!!! Not silly at all !!!!!!!! I do not know what kind do you use , but if it does not say explicitly on the bottle that they are Mercury free, or "pharmaceutical grade" - they probably ARE NOT MERCURY FREE !!! Now don't panic buddy if you took wrong kind - just stop using them and buy high quality ones , like "Nordic Naturals" .
