A sperm count of 15 million per milliliter is right at the lower boundary of the normal range, so please don't worry this is very common and highly improvable. To help boost your count, daily supplements like Coenzyme Q10, Zinc, Vitamin C, Vitamin E, and L-carnitine are excellent for supporting sperm health and motility. If a hormone imbalance is identified, a doctor may prescribe medications such as clomiphene citrate. Additionally, adopting healthy lifestyle habits like regular exercise, a balanced diet, and avoiding smoking can significantly help. I highly recommend consulting a urologist to guide you on the best approach.