Testosterone is the total amount of testosterone that is present in your body. In women, testosterone is produced by the ovaries and adrenal glands. It governs many essential functions, such as sex drive (libido), energy levels, healthy bones, healthy brain, muscle mass, strength, and mood. Your Testosterone levels may fall as you age, so low levels can be a sign that you’re peri-menopausal. If you have low testosterone level you have a higher chance of developing osteoporosis, neurodegenerative diseases, cardiovascular disease and skin aging.