How long can i take vit a, e, c and b-complex without having a break? what about grape seed extract?

Your entire life: By definition vitamins are substances essential for health. While our bodies can store A & E, we can not store C and B vitamins (except B12) so we need those every single day (from diet and/or supplements). These are all very safe so you never need a break. Grape Seed Extract contains beneficial antioxidants and is also safe and non-toxic, so no break is needed. See http://tinyurl.com/pgxt9ep