I've never been told to take any supplement other than my prenatal which has folic acid in it. I've been taking it since TTC and will continue taking it for as long as I breastfeed. I read that Heidi Klum even takes prenatal vitamins even though she isn't TTC pregnant or breastfeeding because she likes how healthy and how fast it makes her hair and nails grow. It was a quote from her in a parenting magazine, can't remember which one, I've read so many since getting pregnant.