Is it alright to take Stresstabs and Hair, Skin & Nails Dietary Supplement?

High Potency Advanced Stresstabs - with B-Vitamins, C + E, plus Zinc for Immune Support.. And GNC Women's Hair, Skin & Nails Formula - Dietary Supplement... I was given both the vitamins by someone and told I should take them both daily, because I'm so stressed out, and my hair use to be soo thick, and now it's thin as heck.. But I hate taking any kind of meds or vitamins.. So, I'm a little worried.. I don't want to O.D. or anything.. They both contain a lot of the same things.. And I'm an 18 year old female, in case that contributes in.