I’ve used this vitamin for a couple months now and i’ve noticed significant difference in thickness. I had bleach blonde hair which completely killed my hair and died it back to brown with the hopes it would grow back healthy. My new hair growth is definitely healthier and thicker than before because of this supplement. I have also seen increased growth because my hair rarely grows fast. It also had some great natural vitamins that your body needs. It is worth the price and I will keep buying it!!