Recent blood tests indicate low Vitamin D levels. The doctor recommended over the counter Vitamin D minimum of 1,000iu per day. Started taking D3 5,000iu per day. Researched same, as suffering from Cronh's Disease that absorbtion can be poor so decided to take 5,000iu daily. Noted from reports that it is necessary to take Magnesium and K2 as well. Would like to know what dosages of Magnesium and K2 are recommended.