 It's coming from most omega-3 fatty acids that are going to be pure or coming from the deepest parts of the ocean. That's why you have tuna and fish like that or salmon because it's coming from cold water, and it's typically not as filled with mercury in those areas. So the deeper waters seem to have less mercury in them, but you still have to be careful, especially if you're pregnant because we know that mercury is not a good thing for pregnancy either.