I purchased two bottles and got one free of a Viswiss product through Nathans Natural. Before purchasing I looked through the ingredient list and did not find any problems for me. When I received the product I tried one tablet and had a bad reaction. I looked at the ingredients and found that it included Niacin. I am allergic to Niacin. I called Viswiss customer service and told them of the problem. The representative said send the unopened bottles back for a full refund minus shipping and handling, which is guaranteed on the web site. When I... read full review »