Testosterone production peaks during early adulthood, and is not just for bodybuilders, it is key in building muscle mass and strong bones. Natural testosterone boosters and supplements can also increase libido, and improve one’s mood. The list below cites evidence-based studies to show if the vitamin, mineral, herb or natural remedy causes a positive, negative or no effect in humans. Most supplements/pills can be bought over the counter, through our site or commercial chains like GNC or CVS. Common testosterone boosters include: Ginger, Maca, Tribulus terrestris, Fenugreek, Horny Goat Weed. Side effects include acne, fluid retention, and increased urination.