Here are some natural testosterone boosters that have been proven to work. 1- Lifting Weights and Exercising 2- Consume protein, fat, and carbohydrates. 3- Stress and cortisol levels should be kept to a minimum. 4- Take a Vitamin D supplement or get some sun. 5- Supplement your diet with vitamins and minerals. 6- Make sure you get enough restful, high-quality sleep.