How long are liquid vitamins good for once opened?

Hello I ave died my hair so meny times I gone from blonde to brown from brown to red and then I got excluded for having red hair and my headmater took me to a hair dresser and made them die my hair ithey died it with four lost of colour Which is bad :( But know I want to go back to my natural ...

I have ultraa nourish-hair says it has 1200 mcg biotin. I only take one a day and it says take two. Would that be ok? Ive taken it for a month or so now and I'm not sure if its grown a lot from it.

My husband wants me to buy him some vitamins because he says that when he is at work and he leans foward and stands up he gets dizzy every time. He just 30lbs in 1 1/2 months because he stopped drinking and cut back on his eating habits. I told him that he should got to the dr but he doesn't want...

I am wanting to go on a diet. I do water aerobics 3 times a week for 1 hour. I don't really eat that bad but I drink 2 diet cokes a day. I have low iron, I'm like a border line diabetic, I was taking vitamins with iron but it messed up my bowels. I don't have normal bowel Movements. I was...

Has any1 use Andrew Lessman Healthy Hair, Skin and Nails?.. If so can you please let me know what it does and does it work?.. Or do you know of any good vitamins and or supplements that is good for the hair,nail and or skin?......my hair has been dropping very badly and my hair is becomeing...