Today I purchased 500mg. bottles of niacin (100ct) from Life Extension. They are on sale for $5.40, but I purchased 4 and the price went to $4.73. I actually purchased 12 (large crazy family) and got free shipping over $50.00. This seems like a very reasonable price. Many expressed interest in niacin for alcoholism, arthritis, lowering cholesterol and even schizophrenia. Life Extension is a wonderful company with great products and lots of information. This is where I purchase my Super K, which goes along with vitamin D. Just thought I would pass along a source to purchase quality vitamins. I am taking their BioActive B complex also, with a general 100mg. profile, in a powdered capsule form and I am finding I like that better than a hard pill. I think you can type in Life Extension.com to get to their site. God bless....