Posted 11/25/2021 19:21 (#9341644 - in reply to #9340580) Subject: RE: Vitamin source
Depends on who you talk to. Minimum 25 to prevent rickets. Minimal 40 for health. Recommend 60 in fall heading into winter so it does not drop below 40.
I have seen a study that showed benefits up to around 80 as I recall. Wife and I both tested basically 75 a few weeks ago which is right where I want to be. It doesn't seem to cause problems with some people testing above 100.
There is a thread over on Kitchen Table with links to a bunch of good resources.