Doctor ran a US family practice clinic with 8,000 patients, most of whom achieved 80 ng ± 10 ng of Vitamin D
In priority order, after Vitamin D, he often added
He typically used 5,000 IU vitamin D pills - and just varied the number of piils per week to get to 80 ng - which varied a lot across his patients
Most patients felt improvement in a few weeks with 10,000 IU daily (2 pills)
The addition of Magnesium was especially helpful with