Hello, Thanks for choosing health care magic for posting your query. Most common reason for a poor erectile strength in earlier good erectile capacity patient is Psychological Problems. There can be n number of reasons and the same can be confirmed after a detailed interview about these problems. I would advice you to consult a psychiatrist or a sexologist for this reason. Also you are very much in suggesting that body supplements may lead to erectile problems. It would have been good if you could have suggested the contents of these supplements. Hope I am able to answer your concerns. If you have any further query, I would be glad to help you. In future if you wish to contact me directly, you can use the below mentioned link: bit.ly/dr-srikanth-reddy Wish you good health, Dr. Srikanth Reddy M.D.