Electrolysis is the only method of hair removal recognized by the U.S. Food and Drug Administration (FDA) as permanent. Unlike laser hair removal, which is cleared only for permanent hair reduction and relies on pigment in the hair, electrolysis works by directly destroying the cells responsible for hair growth. Because it does not depend on hair color or skin tone, electrolysis is effective for all hair types and all skin types.
Electrolysis is performed by a trained professional, known as an electrologist. During treatment, a very fine, sterile metal probe—about the width of the hair itself—is gently inserted into the natural opening of the hair follicle. The skin is not punctured. A controlled electrical current is then delivered to the base of the follicle to disable the structures that produce hair, including the bulge region, outer root sheath, bulb, and dermal papilla. Once these growth cells are destroyed, the follicle can no longer produce hair.
Modern electrolysis is performed using three primary modalities: galvanic, thermolysis, and the blend. Each method is effective. The choice of modality depends on factors such as hair texture, follicle shape, treatment area, skin sensitivity, and the electrologist’s training and technique.
Galvanic Electrolysis: The Chemical Method
Galvanic electrolysis is the original form of permanent hair removal. It was first reported in 1875 by Charles Michel, a St. Louis ophthalmologist who used the method to treat ingrown eyelashes.
How galvanic electrolysis works
Galvanic electrolysis uses direct current (DC). When the current is applied, it interacts with the body’s natural salt and water within the follicle to create sodium hydroxide (commonly referred to as lye). This chemical reaction occurs only inside the follicle and gradually destroys the hair-producing cells.
Galvanic electrolysis is best suited for
- Coarse or stubborn hair
- Curved, distorted, or deep follicles
- Hair that has resisted other methods
Because the chemical action can spread throughout irregular follicle shapes, galvanic electrolysis is especially effective when precision placement alone may not reach all growth cells.
Considerations
Galvanic electrolysis is the slowest modality, often requiring several seconds per hair. Because it uses direct current that travels through the body, individuals with certain medical conditions or implanted devices may need medical clearance before treatment.
Thermolysis: The Heat Method
Thermolysis was developed in the early 1920s by French physician Henri Bordier. Today, it is the most commonly practiced electrolysis modality worldwide.
How thermolysis works
Thermolysis uses alternating current (AC) at high frequency. This energy causes rapid vibration of water molecules surrounding the probe tip, creating localized heat within the follicle. The heat coagulates and destroys the hair growth cells at the base of the follicle.
Thermolysis is best suited for
- Fine or straight hair
- Larger treatment areas such as legs, arms, or back
- Clients seeking faster treatment sessions
Thermolysis is extremely fast—often treating a follicle in fractions of a second—making it efficient for clearing many hairs in a single session.
Considerations
Because the heat is highly localized, accurate probe placement is essential. The effectiveness of thermolysis relies heavily on the electrologist’s skill, experience, and ability to match settings precisely to the client’s hair and skin.
The Blend Method: Dual-Action Electrolysis
The blend method was patented in 1948 by Arthur Hinkel and Henri St. Pierre. It was developed to combine the strengths of galvanic electrolysis and thermolysis into a single treatment.
How the blend works
The blend method uses both direct current (DC) and alternating current (AC). The thermolysis component generates heat, while the galvanic component produces sodium hydroxide. The heat accelerates the chemical reaction, allowing the lye to form more quickly and thoroughly within the follicle.
The blend method is best suited for
- Coarse, deep, or distorted follicles
- A wide range of hair types and growth patterns
- Clients who need a balance of speed and thorough follicle destruction
Many practitioners consider the blend method to be one of the most versatile and reliable options, particularly for challenging hair.
Considerations
The blend method is generally faster than pure galvanic but slower than pure thermolysis. Sessions may take slightly longer, but many clients and electrologists value the method’s consistency and effectiveness.
Choosing the Right Electrolysis Modality
All three electrolysis modalities—galvanic, thermolysis, and blend—are capable of producing permanent hair removal when performed correctly. The most important factors in achieving successful results are the training, experience, and judgment of the electrologist, along with proper treatment planning and adherence to the hair growth cycle.
Sensitive areas such as the face or upper lip may benefit from the controlled approach of galvanic or blend electrolysis, while larger areas often require the speed of thermolysis. Many electrologists are skilled in more than one modality and may adjust techniques throughout the course of treatment.
A professional consultation allows the electrologist to evaluate your hair, skin, medical history, and goals, and to recommend an individualized treatment plan. With consistent sessions and expert care, electrolysis offers a proven, inclusive, and permanent solution for unwanted hair.
