Low height should exercise more. Pay attention to calcium supplement. Apple cider vinegar can help the absorption of calcium. But it doesn't have any special help to grow up. So make sure you take calcium supplements. Drink milk every day. Try playing basketball. It will help you grow. We recommend you to buy American Leli for calcium supplement. It's very effective. And it's not expensive. A bottle of 30 dollars (30 tablets). Very cost-effective.