Always work with a qualified doctor/nurse practitioner when taking Vitamin D supplements. The daily recommended amount is 600-800 (IU) International Units per by. Taking too much can become toxic, and that is not something any of us need. However, under the care of a trained professional higher doses have been known to benefit many people. Dr. Patrick McCullough recently published a report on the experiences of three patients who were taking a higher dosage of 20,000 to 60,000 a day for many years, and all three of them had significant improvements in their health. One of the patients found that his asthma got better. Another patient found that their skin cancer shrank after taking a higher amount. I think 600 IU a day is not enough, but once again you need to be monitored if you decide to take higher amounts.