A quick google yields rbc mag <6.0 is deficient. 6.5 is optimal. Claims weren't linked to any studies.
I can work on it while getting iron and ferritin up. I think d3 will have to wait.
I think I've got to find a way to supplement just iron as my big iron rich foods are usually zinc rich too and I don't want high zinc! I've read the lactoferrin should work with iron supplement if ferritin is too low so I'm trying just the lactoferrin on its own and will add iron if nothing weird happens. If weirdness prevails, I'll get checked for hypothyroidism even though I don't think I have that issue.
Lactoferrin bonus? It's antibacterial, anti-viral, and antioxidant. Couldn't find anything about it being bad or good for msers.
Back to work, you!