Abstract: The invention provides containers for pressuring an aqueous liquid with a gas to increase the concentration of the gas in the aqueous liquid. The container employs one or more moveable sections to reduce the accessible volume of the container, e.g., allowing gases such as H2 to become supersaturated within an aqueous liquid.

Abstract: The invention provides compositions for producing hydrogen rich water, nutraceuticals, cosmetics, pharmaceuticals, and other products. In one embodiment, the invention provides a composition, e.g., a tablet, including magnesium metal, at least one water-soluble acid, and a binding agent. The magnesium metal and at least one water-soluble acid may be present in amounts sufficient to maintain a pH of less than 7, e.g., at a specific time period after reaction, and a concentration of at least 0.5 mM H2 after reaction in 50 mL water in a container e.g., a sealed or an open container, e.g., at least 0.5 mM H2 after reaction in 100 mL water or at least 0.5 mM H2 after reaction in 500 mL water. The composition may also include a lubricant.