Lung capacity is something that can be difficult to improve with vitamins. While a healthy diet is an important part of optimizing your ability to perform at a high level, the actual amount of air that your lungs can inhale is mostly affected by the combination of your natural lung capacity and your conditioning status. For the most part, we are all born with a predisposed size and ability that our lungs will achieve. This can be altered based on our nutrition status as we grow, our exercise (or lack thereof), and how much weight we gain. Other factors, such as smoking and a history of illness
, can also affect how well our body does at taking in and using oxygen. There are many people that use different medications and substances to improve their performance, many of which are not necessarily legitimate and can have long term side effects. The best thing to do if you are trying to increase your ability and performance is to work with a strength and conditioning coach to make sure that you are doing everything that you can to be physically fit. Your doctor
can also help to make sure you are fully healthy. Please speak to your doctor.