Are there any shampoos or conditioners that help split ends?

I have split ends and i straighten my hair every day. I was wondering if there are any products like shampoos, conditioners, any treatment things i can do. and if i use a spray that helps not burn your hair when you straighten it, will that help? I really want healthy hair and i want long hair again but split ends are keeping it from growing faster. I was thinking about maybe using biotin vitamins because i want longer nails too...and i was wondering if they would help..and i'm 12 too so i didn't know if i am able to take them....