One ingredient found in almost all tablet or capsule containers is a 'desiccant' - cotton batten or a small canister containing a harmless, water-absorbing compound.

Silica gel isn't a true gel, but a granulated chemical 'desiccant' composed partly of silicon.

Anhydrous sodium hydroxide is another common laboratory 'desiccant' , or substance that removes water.

a small packet of 'desiccant' to absorb any moisture

However, 'desiccants' contain chemical agents that may be toxic to children, pets, and the chemically sensitive.

Unlike cooling-based dehumidifiers, which cool the air to condense moisture, 'desiccants' attract moisture molecules directly from the air and release them into an exhaust air stream.