I once purchased Serrapeptase because of all the talk about it, but it really isn't so great.
What it does do is disolve Ehrlichia Tumors so most people love it for what it does to them.
That said Boron is better at this than Serrapeptase: http://curezone.com/blogs/fm.asp?i=1565856#i
I'm afraid of supplementing with metals while still have mercury. (boron is metalloid)
I used Doctor's Best bottle with 270 capsules serrapeptase and I'm very satisfied. It really relieves pain of any kind and I noticed that reduces one of my old scars on my left hand.
I'm just wondering if nattokinase is better :)
I am no expert, but I have done some research on these. My father was to be put on Warfarin/Coumadin, and I did not like that one bit. Nattokinase acts like warfarin... it thins the blood as well as stops plaque from building up on the atreries. Serrapeptase disolves what has already built up.... so you can use both... one to disolve old deposits, one to stop more from adhereing.