How Much Vitamin D3 To Take For Hair?

[Outsider626]

I know that doctors recommend 800 IU daily for adults.

However, some studies suggest that a higher daily intake of 1000–4000 IU (25–100 micrograms) is needed to maintain optimal blood levels.

What is a proper dosage for hair?

 

[WheeljackG1]

Not sure what's "proper". I had a pretty bad D deficit. After maybe 4 months of 5000iu most days, 1000 some days, I went from far below average to the minimum required to be considered in the normal range.