Bio-Tech: #1 highest recommendation on Amazon – of any size
Bio-Tech: Lowest cost of all 50,000 IU
Bio-Tech: Low cost for 5,000 IU
Bio-Tech: No known reactions to Bio-Tech Vitamin D
Other suppliers sometimes have both short and long-tem problems
Bio-Tech: Water-soluble, tasteless.
Permits you to add it to beverages, foods
All other suppliers appear to have fat-soluble vitamin D