Which form of current is used by micro currents units?

• A. Direct current
• B. Pulsed current
• C. Alternating current
• D. Mixed current

Answer: (C)

Microcurrent therapy relies on delivering very small electrical signals to skin and underlying tissues to coax muscle activity and tissue response. Using alternating current means the current periodically reverses direction, which prevents the buildup of charge at the electrode–skin interface and avoids constant electrochemical changes in the tissue. This makes the treatment safer and less irritating at microamp levels. It also mirrors the body’s own fluctuating bioelectric signals, so the stimulation can feel more natural and can be modulated (frequency, waveform) to achieve muscle toning, improved circulation, and collagen support. Direct current would push ions in one direction, risking polarization, pH shifts, and skin irritation over time, which is why alternating current is the preferred form for microcurrent units.