Hydrogen is the smallest element in the known universe. Because of this, hydrogen gas can penetrate through the wall of plastic containers and escape through the seal of aluminum cans and pouches.

Japanese scientists led research into the potential benefits of molecular hydrogen. Consequently, the market is flooded with hydrogen water products in both plastic and aluminum containers. In 2015, the Japanese Consumers Affairs Bureau tested the hydrogen concentration in those products, finding that they did not contain as much hydrogen as their label claimed.

A simple answer to the questions is, “Make hydrogen water and drink it as soon as practical.”