There is no specific vitamin that has been proven to help with altitude sickness. However, some vitamins and supplements may help reduce the risk of developing altitude sickness or help lessen its symptoms. These include: Vitamin C: This vitamin helps protect against cell damage and supports the immune system. It can be found in citrus fruits, tomatoes, broccoli, and leafy green vegetables. Vitamin E: This vitamin also helps protect cells from damage and supports the immune system. It can be found in nuts, seeds, and vegetable oils. B Vitamins: These vitamins are important for energy production and metabolism. They can be found in meat, poultry, fish, eggs, milk, and legumes.