Vitamin D deficiency
Vitamin D deficiency is very common. Patients are to buy their own vitamin D over the counter at the pharmacy or some bigger supermarkets, they shouldn't be too expensive.
For a mild deficiency (blood levels 30-50), the recommended dose is 1000iu VitD, 2 tablets daily for 4-6 months. For severe deficiency (blood levels 15-30), the recommended dose is 1000iu but 4 tablets daily for 3 months, then recheck blood levels.
Patients with slow kidneys or kidney stones should be checked sooner.