Check every one of your patients vitamin D levels with a serum 25(OH)D assay. I live in a very sunny part of the country yet 90% of my patients are vitamin D deficient or flirting with the lower end of the range. Current recommendations are to start with 50,000iu of vitamin D3 a week to get levels into the normal range. The range is very wide at 30-100 ng/mL. From my experience, 50,000iu of vitamin D3 weekly will only increase the levels 20 points at best. Consider using 10,000iu daily instead. I consistently see this increasing patients to more optimal levels of 50-60 ng/ml. Consider dosing with 160mcg of Vitamin K2 along with the Vitamin D to prevent calcification of the vascular system as well.