Testosterone.

Testosterone levels decline by 0.4-2% per year after the age of 30, and approximately 13% of men suffer from low testosterone all their lives. This leads to a decrease in erection and sexual desire. What you need to do to raise testosterone levels: 1. Experience regular physical activity. 2. Normalize the emotional state. 3. Improve nutrition and lose weight. 4. Set up sleep. 5. Sunbathe and take vitamin D - a system-forming element for the production of testosterone.