What is one of the physiological functions of microcurrent therapy related to skin treatment?

Microcurrent therapy is known for its ability to stimulate facial muscles, leading to a firmer appearance of the skin. This treatment utilizes low-level electrical currents that mimic the body's natural electrical signals, promoting muscle contraction in targeted areas. As the muscles are toned and lifted, the therapy contributes to an improved contour of the face, making it look more youthful and vibrant.

The other options do not accurately reflect the physiological functions of microcurrent therapy. For example, decreasing collagen production and enhancing wrinkle formation contradict the goals of skin treatment that seeks to maintain youthfulness. Additionally, reducing blood circulation would not be beneficial and is not a function of microcurrent therapy, which often promotes circulation and lymphatic drainage, leading to healthier skin overall.