Lift heavy weights
Sprint or do high-intensity interval training
Get enough sleep
Reduce excess body fat
Eat enough calories
Eat enough dietary fat
Ensure adequate zinc intake
Ensure adequate vitamin D intake
Manage chronic stress
Avoid overtraining
Limit alcohol intake
Treat sleep apnea if present
Address low testosterone if present
Review medications with a clinician
Avoid finasteride and similar 5-alpha-reductase inhibitors if medically appropriate to stop
Avoid saw palmetto and other DHT-lowering supplements
Maintain a balanced diet with sufficient protein
Get regular sunlight exposure
Correct nutrient deficiencies
Consult a healthcare professional before using hormones or supplements