His target levels for Covid are too low, but he does say:

9:50 “Prolonged exposure to sunlight itself does not cause toxic levels of vitamin D in the body. That’s because there are multiple studies that show that prolonged exposure of the skin to sunlight results in a maximum level of 75ng/ml”— which is right in what many consider to be the 60-80ng/ml sweet spot.

Vitamin D3 (Cholecalciferol) and Vitamin D2 (Ergocalciferol) and Calcitriol | All About Vitamin D

May 21, 2020