Keto XP Other herbs can increase sexual stamina and help prevent premature ejaculation. Another herb, Tongkat Ali, is very effective at boosting your body's production of testosterone. This kind of is the science which involves the use of naturally occurring substances like plants, leaves, minerals, vitamin supplements, flowers, fruits, etc to combat diseases. Read on to find out how this pill increases the girth of the penis. Increase the number of strong erections. #2.Keto XP: Best For Erections.