Tongkat Ali is a natural supplement that can increase testosterone levels without side effects by stimulating leydig cells in the testicles to produce more male hormones. Taking Tongkat Ali every day is not recommended, and the best way to take it is to follow a cycle of one day on and seven days off, supplementing with other natural testosterone boosters on the off days. This document promotes Tongkat Ali and provides a link to purchase it at a discount from Physician Formulas.