Yes that's true. But then I have noticed that enzymes do have some effect when I take them. I can't say if they are dissolving clots but I feel a something going on. Also a lot of foods contain enzymes of various types, often to help in the digestion of that food but it would make sense that they do get absorbed into the bloodstream as well. I'm heading out for a couple of days soon so wont have time to look up enzyme absorption. MIght do that next week if I remember.
