Too late. Have been on Vit D3 / K2 supplementation for years. Haven't had a cold or flu for.... Years. My Serum level is always on high side of the Bell Curve

Why test ?- Because individual D - level is not tied to dose, we're all very different in how we absorb or generate it.
(K2 "re-directs" calcium into bones, not arteries)
"Deficient" is regarded as <30nmol/L, 50 and you're looking Good, 70 and beyond is Jolly Useful and to be desired. Over 120 and you'll rarely get any 'flu.
The Yanks use a funnier measurement, ng/mL, in which you want at least 30 to feel safe. 70 is great !
Dose advice ranges from 2,000 IU to 10,000IU. Dr Tony FAUCI admits to taking 6,000IU. - He does not have covid (That we know of...) but then again, he appears to be in excellent health - for any age above 50. I think he's 80 - something.
IF you take a Statin, then pills/Cod Liver Oil supplements are useful, as low cholesterol = lower sun-generated Vit D.
How useful ? - higher initial Vit D correlates with milder symptoms / no infection than 'Deficient' numbers. - I'll take every advantage I can get, at my vintage ! Some treatment protocols use high doses of D, 10,000 or more.
Gosh, the things we find on a 4WD forum !
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