Hi,
Welcome to the forum and I am really glad to help you out. None of the methods commonly used for the enlargement/extension of penis are safe and thus should be avoided.
Hence, none of the methods should be used. For e.g., Extenze, one of the commonly used methods has a doubtful role in causing an increase in the size of the penis.
Rather, it has many side effects which include increased body temperature, increased blood pressure, sweating, increased heart rate, nausea, and upset stomach.
My sincere suggestion is to avoid using any method to enlarge/lengthen the penis. I sincerely hope that helps. Take care.