Maca (Lepidium meyenii) is a plant native to the Andes of Peru and Bolivia, where it has been used as an important food and medicinal crop for at least 2000 years.
Maca Extract is now a common ingredient of several herbal supplements that are designed to improve male fertility and libido and to enhance semen quality, but is there any evidence for the benefits of Maca?
Kanna is the most common English name for the plant Sceletium tortuosum, a small succulent native to South Africa. Kanna has long been famed for it's mood-altering effects, and was traditionally chewed, brewed into a tea or smoked. These days Kanna is now available as a standardized Kanna Extract.
The effects of Kanna vary depending upon the dosage and upon other factors such as whether you have taken other substances, including alcohol. In general most people take Kanna as a daily supplement to reduce stress and anxiety and promote calmness and wellbeing. At lower doses the effects of Kanna include mild relaxation, a reduction in stress, calmness, increased happiness and improved ability to sleep.
Tribulus terrestris (also called puncture vine) is now a very common ingredient of many performance enhancing supplements aimed at bodybuilders and at men who want to get more from their sex lives, and is even taken on it's own in concentrated extract form, but is the plant completely safe for people to use?