Just wanted to add magnesium can affect your BP (lower) and that I was taking a multivitamin once a day along with a Nac/zinc/quercetin supplement and then 1000iu of vitamin D3 and K2 a day also. Don't take the zinc and magnesium at same time but you can take one of them w/the D3. D3 needs K2 to help with absorption but also needs zinc and magnesium to work but they compete with each other so take them apart by a hour or 2. I think the magnesium was the key because I had already been taking the other stuff for awhile but it wasn't til after adding the magnesium that I noticed the difference.