Advance Physician Formulas
a nutritional supplement company founded in 2003
Supplement Research Updates
Question: According to my blood work my vitamin D3 level was considered deficient (11 ng/ml). My doctor prescribed me 50,000 IU once a week for 8 weeks. After taking the high dosage she instructed me to follow up with taking 2,000 IU daily. I've been feeling horrible. I'm tired, have...