The most common result of taking a multivitamin is hair that has more strength and is less likely to break. Multivitamins can also help with hair growth, which is why many people take them for this purpose. Some supplements such as riboflavin and biotin can help improve scalp circulation and produce healthier hair. The potential downside to taking a multivitamin is that it contains too much of certain nutrients. While hair growth supplements are specifically designed to help with hair growth, a multivitamin tablets for women contains too much of most nutrients for this purpose.