2 ms·Can you corroborate their opinion with other sources? It’s not very evidence based.by hombre_fatal 3y agoCan you corroborate their opinion with other sources? It’s not very evidence based.bousenta 3y ago[flagged]mchinen 3y agohttps://vitamindforall.org/letter.html https://vitamindforall.org/letter.html is a letter that goes into why >= 4000 IU daily is recommended based on blood serum levels with more literature review.