I buy over the counter Niacin to take to boost up my good colestrol (I'm like Jack I don't know how to spell that word, never do). It seems to work so I take two 500 mgs. a day. One after lunch and one at bedtime. I have several prescription drugs I take too and I always pour them into my hand and look at them before I swallow. Yesterday after lunch the Niacin pill looked different. It was white like it should be, it was the length it should be but it was flatter then the round Niacin. Humm I wonder what it is and how it got there? I'm glad I didn't swallow it.