The water molecule has two hydrogen atoms, chemically bound to the oxygen atom. This is different from the hydrogen gas molecule (H2), which is just two hydrogen atoms bound only to each other.
Here’s an example: we need oxygen (O2) to live, so why can’t we just get our oxygen from drinking water H2O? It’s because the oxygen is chemically tied up in the water molecule. We need available oxygen gas, (O2) that is not bond to other atoms or molecules. By the same token, we need the available hydrogen gas (H2).
This is why water is not explosive or doesn’t burn. Although, it contains hydrogen, which is flammable, and oxygen, which fire needs to burn, the hydrogen and oxygen are bonded together to form water (H2O). Thus, water is not flammable-in fact; H2O is what we use to extinguish fires.
Furthermore, virtually everything has hydrogen atoms in it, but those hydrogen atoms are chemically tied up with other things. For example, a water molecule has two hydrogen atoms that are chemically tied up with the oxygen. Or, a sugar molecule like glucose contains 12 hydrogen’s, but those hydrogen’s are all bound to other carbon and oxygen atoms. In hydrogen water, the hydrogen that is shown to be therapeutic is the available dissolved hydrogen in its diatomic form, called molecular hydrogen.