My doctor (who recommended Atkins and is on Atkins maintenance herself) said that only a daily vitamin is really necessary as long as you are eating your veggies , but I also take fish oil, calcium, and a psyllium husk ( for fiber/regularity) tab daily just cause they make me feel good . I know that I probably get more vitamins in my body now on this WOE than I ever did before though, with or without the supplements. Gotta love LC!!