Besides it being sulfate free it's 100% vegan and it makes my hair look healthy after all the abuse I put it through. Without this stuff my hair would probably just crack off from all the flat ironing I do to it. I also love that it doesnt cause my hair color to fade as well. I used to use the repair line but now I use the Strength Cure line.
I'm currently trying vitamins myself because I've read so many success stories. My friend had cystic acne and he cleared his skin up using a variety of treatments including vitamins.
However, the stories I've heard/my friend did not use a multivitamin, so I'm taking Vitamin A, Vitamin E, Vitamin C, Vitamin B12 (not necessarily for skin) and Zinc once a day. You might have better luck taking the vitamins separately!