Molecular hydrogen or H2 gas is a very small neutrally charged molecule that has the ability to cross cell membranes and the blood-brain barrier. This gives it the unique ability to access DNA and mitochondria within the cell where it has protective action.
Free radicals are uncharged or unstable molecules, which make them highly reactive and extremely likely that theyâ€™ll pull apart pieces of other molecules to gain stability. In their search for stability, they can damage your body. Sometimes this can result in chain reactions. Antioxidants are molecules that safely stabilize free radicals and reduce the amount of damage that can be done.