There are two ways to consume molecular hydrogen:
inhalation and hydrogenated water.
Hydrogen inhalation machines can be a good option because they provide a lot of molecular hydrogen.
The problem with hydrogen inhalation is that most of the benefits are limited to the respiratory system, specifically the lungs, which makes it harder to get the holistic health benefits that hydrogen can provide.
The other option, hydrogenated water, is the more common method.
When you drink hydrogen-enriched water, the molecular hydrogen is easily able to get into the bloodstream and move throughout the whole body, providing holistic health benefits.
This is why you want to have a higher concentration of molecular hydrogen. The more hydrogen you have, the easier it is to improve your health.