Height is primarily determined by genetics. Once your growth plates fuse, typically by age 18 to 21, no supplement or medicine can increase height. Beware of over-the-counter products claiming to increase height; they are ineffective and unscientific. Growth hormone therapy (using generic somatropin) is only medically indicated and effective if a doctor diagnoses a growth hormone deficiency before your growth plates close. To maximise your genetic potential, focus on a balanced diet rich in calcium and vitamin D, regular exercise, and getting 8 to 10 hours of quality sleep daily, which naturally stimulates growth hormones. Consult an endocrinologist for personalised advice.