Nana is not a doctor but I cut my blood pressure meds in half and some days dont take at all.

I have my particular vitamin intake but I think the deciding factor was pink Himalayan salt.
My blood pressure actually dropped too much, and I found that what was making the difference was my afternoon popcorn treat covered, COVERED in the Pink Himalayan salt.
Never never use that iodized shit.

I have tested it out and I know for sure that it was lowering my blood pressure by changing only that daily.
Now idk if it will work for you or not, but it affected me that way.
They say stress is a big culprit too.
Try grounding/earthing as much as possible and espson salt baths.