As with anything, check with one's doctor particularly if taking medications when taking any supplements. Vitamin D may be obtained from 20 minutes of sunshine so going outdoors would be a good idea along those lines. In terms of Vitamin C manay say 'any kind will do' while Gregg Braden suggests a certain kind. So again do some research. Some folks say 'check the sources' for any 'funny business or GMOs, etc' and authenticity.' Yet plenty of alternative health folks have suggested this is a big help to our bodies.
None of what I share on this blog is intended to direct one in their health