The complete IPL hair removal guide

The effectiveness of Intense Pulsed Light (IPL) has been studied extensively within dermatological science. Numerous clinical studies show that IPL, applied correctly, can deliver a lasting and significant reduction in hair growth.

A 2021 systematic review of at-home devices in dermatology confirmed this: at-home IPL proved effective and safe, with all randomised studies reporting a reduction in hair density of more than 50% and only mild, temporary side effects (Cohen et al., 2021).

Individual clinical studies support these findings too. A study of 70 women at Maastricht University Medical Centre showed an average hair reduction of 87% after around eight sessions, with results lasting more than 27 months (Schroeter et al., 2004).

The effectiveness of the Laesera Nova One IPL fits this picture. In a clinical test by Shenzhen Mlay Intelligent Technology Co., Ltd. (T16 model, 2023), 20 test subjects achieved 80% hair reduction within seven weeks, with no serious side effects such as swelling or ulceration. The device was clinically validated as safe and effective for use at home.

These results are explained by how IPL works: the light penetrates into the hair follicle, where the energy is absorbed by melanin and converted into heat. This heat weakens the hair root, slowing new hair growth. Because surrounding tissue is largely spared, the skin barrier stays intact and irritation is kept to a minimum.

How IPL works starts with the interaction between light and pigment. Every hair follicle contains melanin, the pigment that determines your hair colour. During an IPL session this pigment absorbs the light emitted, which is then converted into heat. That heat reaches the hair root and gradually weakens it, slowing hair growth without damaging the skin itself.

This process is called selective photothermolysis: the light targets the dark pigment in the hair specifically, while the surrounding skin is left alone. That is why IPL works most effectively on skin types I–IV with dark hair. Modern IPL devices, such as those from Laesera, are also fitted with automatic skin tone detection. The light intensity is adjusted to your skin every time, which makes the session not only effective but also safe, even on sensitive skin types.

Because IPL uses a broad spectrum of light pulses, several hairs can be treated at once. That makes the system particularly suitable for larger surfaces such as legs, arms or back.

In short: IPL targets the hair follicle, not the skin. This keeps the skin barrier intact and makes hair removal not only effective but also dermatologically sound.

Comparative research also shows that IPL has a favourable safety profile relative to other light and laser therapies. A clinical study of 66 women with hirsutism showed that both diode laser and IPL are effective for hair reduction, but that IPL produced fewer side effects and better outcomes on fine hair (Karadaghy et al., 2020).

Safety always comes first when using IPL technology. Modern IPL devices, such as those from Laesera, are fitted with several sensors and protective mechanisms to ensure a safe session at home.

A key role is played by the automatic mode with skin sensor function, which recognises the skin tone automatically and adjusts the energy level accordingly. This prevents too much light energy being delivered to skin that is too dark. IPL devices also have light filters that only let through specific wavelengths (for example 510–1200 nm). This means only the desired light spectrum is used, the part that is effective on hair follicles, while harmful radiation is blocked.

The flash button generally only works when the device is in full contact with the skin, an extra safeguard that prevents unintended light pulses. Together with automatic temperature control and ice cooling, this makes for a safe experience that is gentle on the skin.

In terms of regulation, quality IPL devices meet international safety standards such as:

• - CE marking; indicates that the device complies with European directives on electrical safety (LVD), electromagnetic compatibility (EMC) and user protection.
  
• - RoHS certification; guarantees that the product is free from harmful substances such as lead or mercury.
  
• - FDA 510(k) clearance; confirms that the device is safe for cosmetic use according to the standards of the US Food and Drug Administration.
  
  

Thanks to these safety mechanisms and certifications, IPL devices are suitable for responsible use at home, provided they are used according to the manual and the skin is properly cleaned and shaved beforehand.