Nattokinase and soy sensitivities

I am not allergic to soy, but when it hits my colon in about 18-20 hours I get really sick feeling for a few hours. Soy milk and soybean oil do this to me; however when baked, like pizza crust or cookies, it does not effect me. I haven't had the nerve to try fermented soy and see the effects.

So my question is, does anyone have this problem, and should I try nattokinase, which is derived from soy? I'd rather do lumbrokinase, but lucky me, it's much more expensive!

I would also appreciate brand suggestions.

Thank you.

I have irregular soy sensitivities. I cannot do tofu or in a few hours I am in horrible gas pain.... I mean horrible. But, I have accidentally done soy milk in my coffee and was okay.... maybe the brand? I have no idea.

I just know that the pain is not worth any experimenting for me.

Oh and I did Natto for about a week (no reaction) and then the bottle of pills just sat there until I finally threw them away because they were old.