Methyl Arimatest is a supplement designed by MuscleMeds which is purported to increase testosterone levels in men. The supplement features 7-Arimatase and dihydrotase. While the MuscleMeds website states that the supplement has been tested and proven to increase testosterone, the U.S. Food and Drug Administration has not evaluated the claims.
According to WebMD, testosterone affects sexual health and development. In men, testosterone is made in large quantities by the testicles. In men and women, the adrenal glands produce minor amounts of the hormone, and women's ovaries also produce minor amounts of testosterone. Testosterone levels may vary throughout the day and are typically highest in the morning and lowest in the evening.