Testosterone is a hormone that affects the growth of facial hair, and its levels can vary. Males between 19 and 38 typically have a range of 264 to 916 nanograms per deciliter .
In fact, low testosterone is one of the primary causes of low estrogen in men. In the male body, an enzyme called aromatase breaks down testosterone and releases estradiol as a byproduct. Aromatase is found in estrogen-producing tissues like the adrenal glands, brain, fatty tissue, and even the testicles. A quick look at the best at-home testosterone tests. Best for customer support: LetsGetChecked Testosterone Test | Skip to review. Best for a testing subscription: Everlywell Testosterone Test UDRCWBr.