I have maintained a regular regimen with vitamins most of my adult life. I recently changed over to the Catalyst 4 Fitness brand multi-vitamins and within a few weeks my skin texture has improved. It doesn’t get as dry and seems more supple. My nails are healthier and growing like crazy. And OMG, my hair? WOW! It is so much thicker and stronger. It is amazing the difference. If it does that much on the outside, imagine what it is doing on the inside!