What type of current produces chemical changes through iontophoresis?

Iontophoresis is a process that uses electrical currents to drive ionic solutions into the skin, producing chemical changes in the tissues. The type of current that is specifically used for this purpose is galvanic current. Galvanic currents are direct currents that create a chemical reaction when applied to the skin, which is essential for the iontophoresis technique. This current allows for the penetration of substances, such as vitamins or medications, into the skin more effectively by ion transfer.

Microcurrent, while it is used in various skin treatments, primarily focuses on muscle stimulation and does not produce the chemical changes needed for iontophoresis. Tesla high-frequency current is used for stimulating the skin and disinfecting, but it does not facilitate the chemical reactions associated with iontophoresis. UVA current, which is a type of ultraviolet light, is mainly utilized for its effects on skin conditions and does not pertain to electrical currents or chemical changes at the skin level.

Understanding this context helps to elucidate why galvanic current is the appropriate answer when discussing iontophoresis and its role in producing chemical changes in the skin.