The perceived energy boost from raising vitamin D levels from 3 to 30 ng/mL may be largely due to the placebo effect rather than physiological benefit.

“but I would say the placebo effect is huge when somebody is a vitamin D level of 3 and all of a sudden 30 they're like man have so much more energy I feel great you know but that's more anecdotal but I don't know physiologically they're really getting some benefit yeah”