I am 32 years old, and took Niacin, 3 capsules at one time, because a friend said it would cleanse my body of toxins, and is very healthy. I was 18 years old when I took it... I still have hyperpigmentation all over my body, especially my thighs, arms, torso, and back. I'm not talking about a couple little spots, I am talking about thousands. Since they had appeared, I have been unable to wear short sleeve shirts, or shorts, or tank tops, or anything else that would show them body parts.