Galvanic electrolysis destroys hair follicles through a chemical reaction that converts the body’s own salt and water into a caustic substance called sodium hydroxide, or lye. This lye dissolves the cells responsible for hair growth, making it one of the few methods capable of permanent hair removal. The process also produces temporary skin effects like redness and swelling, which typically resolve within hours to a couple of days.
How the Chemical Reaction Works
A thin probe is inserted into the hair follicle (not into the skin itself, but into the natural opening where the hair grows). A low-level direct electrical current flows through the probe and into the moisture surrounding the hair root. That current triggers a chemical reaction: the salt and water naturally present in your tissue are converted into sodium hydroxide.
Sodium hydroxide is the same compound used in industrial drain cleaners, but inside the follicle it’s produced in tiny, targeted amounts. It breaks down the proteins in the hair growth cells, destroying their ability to produce new hair. Because the reaction happens at the base of the follicle where the growth cells live, it can permanently disable hair production in that follicle when done correctly.
Effects on the Hair Follicle
The primary effect is destruction of the cells that generate hair. Each follicle has a cluster of growth cells at its base that are responsible for building new hair strands. The lye produced by galvanic electrolysis chemically dissolves these cells, which is why the method can achieve permanent results.
However, not every follicle is permanently destroyed in a single treatment. Hair grows in cycles, and only follicles in the active growth phase are fully vulnerable. Hairs in their resting or transitional phases may survive treatment and need to be treated again during a later session. This is why electrolysis requires multiple appointments over weeks or months to clear an area completely.
Effects on the Skin
The most common skin reaction is redness and mild swelling in the treated area, which appears immediately after a session. For most people, this clears up within a few hours. Occasionally it can last a day or two, but that’s relatively uncommon. There are generally no permanent side effects from properly performed galvanic electrolysis.
Small scabs or tiny pinpoints of blood can occur if a hair is treated too deeply or a small blood vessel is nicked during the process. These are considered normal and heal on their own. The skin is most sensitive in the first 24 to 48 hours after treatment, which is the window where gentle care matters most.
For people with highly sensitive skin or skin prone to darkening after irritation (post-inflammatory hyperpigmentation), practitioners can use insulated probes that limit how much of the metal is exposed. This concentrates the chemical reaction at the tip of the probe, deeper in the follicle, while reducing heat and irritation at the skin’s surface.
How It Compares to Thermolysis
Galvanic electrolysis is one of three electrolysis modalities. The other two are thermolysis, which uses high-frequency alternating current to generate heat that destroys follicle cells, and the blend method, which combines both approaches.
Thermolysis is faster, but it comes with a higher regrowth rate. Research published in PubMed Central notes that thermolysis is associated with regrowth in 20% to 40% of treated follicles. Galvanic electrolysis is slower but tends to be more thorough because the chemical destruction is less dependent on precise probe placement.
The blend method has become the preferred technique for most providers today. It uses direct current to produce sodium hydroxide (the galvanic component) while simultaneously using alternating current to heat the follicle. When sodium hydroxide is heated, it breaks down proteins faster, so the blend method speeds up what galvanic electrolysis does on its own. This maximizes both treatment speed and effectiveness.
What Treatment Feels Like
Galvanic electrolysis is slower than thermolysis. Each individual hair typically takes between 5 and 10 seconds of current application, with thicker or coarser hairs sometimes requiring up to 13 seconds. For comparison, thermolysis can treat a hair in a fraction of a second.
The sensation is often described as a warm, tingling, or stinging feeling at the follicle site. Because each hair requires several seconds of current, sessions covering large areas can be time-intensive. A full upper lip clearance, for example, might take longer with pure galvanic than with thermolysis or the blend method. Many practitioners have shifted to the blend technique specifically to reduce time in the chair while keeping the chemical thoroughness of galvanic current.
Who Should Avoid Galvanic Electrolysis
The most important contraindication is electronic implanted devices. Cardiac pacemakers and implantable defibrillators can malfunction when exposed to the electrical current, potentially causing dangerous heart rhythm changes or device reprogramming. Other implanted electronics, including cochlear implants, neurostimulators, and insulin pumps, carry similar risks.
People with active blood clots (deep vein thrombosis) should also avoid electrolysis in the affected area, because the stimulation could theoretically dislodge a clot. Treatment over or near known tumor sites is avoided as well, due to concerns that increased blood flow and metabolic activity in the area could affect tumor behavior. If any of these situations apply to you, it’s worth discussing them with your provider before scheduling treatment.