I have been taking Daily Immunity Booster for over 25 years. My Doctor recommended it to me and said he, himself, took Daily Immunity Booster, and so I decided to try it for myself. I have continued to take it all these years because it has helped me feel more energetic, and I feel that my system is able to absorb these vitamins more easily than others I have taken in the past. I have, every once in awhile, tried another multi-vitamin, but still feel these are digested better.