TLS is a good name in USA. It is now in maximum countries in the world. Vitamins will always prevents diseases, Because it has immune power. All types vitamin counts under TLs brand, vitamin a, vitamin b, vitamin c, vitamin d and many more. TLS vitamins is always helpful for all. Regular having it, or by prescription that must be depends on doctors. Vitamin does not have any draw-backs. https://luv2s.com/