Purchased one bottle. So far this product IS making me feel better but I'm giving it 3 stars because I am concerned about the long term use of one of the ingredients: pau d'arco. I have taken this herb before and had been advised that it is not something to take long term. Perhaps I am wrong and I called the company to ask about this but they did not return my call to address the issue so I am posting it here to see if I can maybe get an answer that way? If it IS safe, I would buy it again. If it isn't, I might try to find another vitamin.