When you don't have enough hydrogen in the body, the rate of energy production will be reduced. Hydrogen plays an important role in energy production in the body. Hydrogen also protects the body from free radical damage.
Your body has no need for free hydrogen. In fact, there is very little hydrogen in the air. Hydrogen is a component of nearly all organic compounds, but is not useful to the body in the free gaseous form. Hydrogen does not capture free radicals.