Average blood levels of calcidiol in people with abundant exposure to sunshine range from 40 to 65 ng / mL.62 These levels are most likely perfectly safe when intakes of vitamins A and K2 from organ meats and animal fats are just as abundant as the sunshine. (westonaprice.org)
The research cited above, moreover, suggests that vitamin D would be stored in adipose tissue at these levels and released when calcidiol levels drop, as they would during the winter in temperate climates — an added bonus for those who wish to obtain their vitamin D from foods like cod liver oil and fatty fish rather than from supplements during the winter. (westonaprice.org)
The modern criteria for judging nutritional vitamin D status, however, is the level of calcidiol in the blood. (westonaprice.org)