For Nattokinase, I would suggest NOW Foods as I trust their quality.
For cholesterol in general, we are going to be coming out with Cholesterol Support XT in the next couple of months. I did a test run on the ingredients earlier this year and I had posted my bloodwork before and after and it was pretty significant. I've had issues with my cholesterol being naturally higher than you would think it would've been based on my diet and it worked great. We had a lot of people asking us to use Red Yeast Rice in the formula and I wouldn't because its something I'm not personally comfortable taking or selling to people and I think it should always be a single ingredient item for people that really need it and have exhausted other options.
My bloodwork change on my cholesterol in 4 months earlier this year was significant enough that my doctor had me have it rechecked bc they thought it was an error, so I took that as a compliment haha.