For which therapy is galvanic current predominantly used?

Galvanic current is predominantly used in iontophoresis, which is a technique that utilizes electrical current to enhance the penetration of products into the skin. In iontophoresis, the galvanic current helps to push specially formulated serums or medicinal substances across the skin barrier, making them more effective in treating various skin conditions. This method can effectively deliver hydrating agents, anti-aging compounds, or medications deep into the skin, resulting in more visible and pronounced benefits compared to topical application alone.

In the context of the other options, while techniques like microdermabrasion, laser treatment, and chemical peeling may involve various forms of electrical or mechanical processes, they do not specifically rely on galvanic current for their primary function. Each of these therapies has its unique mechanisms and tools designed for exfoliation, rejuvenation, or skin correction, rather than facilitating product penetration through electrical means. Thus, iontophoresis is clearly the therapy that aligns directly with the application of galvanic current.