What is IPL Hair Removal? Is it Really Permanent?

What is IPL?

IPL, which actually stands for intense pulsed light, uses powerful light rays to treat various dermatological conditions as well as providing an effective means of hair removal.

Originally IPL was developed and used for medical and cosmetic purposes only, until it was noticed that as well as benefiting a patient's skin condition, it left them with reduced amounts of hair on the treatment area.

Braun FaceSpa 830 how to use

Thereafter, experiments were performed to gauge the efficacy of IPL for hair removal with the first IPL Hair Removal System being approved for use in the USA in the mid-90's.

The early machines were operated by clinicians and used virtually unfiltered light which led to unwanted side effects and high levels of discomfort.

In addition, results were inconsistent and sometimes disappointing for such highly expensive treatments.

The technology has been developed and improved over the years, so that now the machines have inbuilt filters to block unnecessary and harmful wavelengths and include cooling features, both of which serve to minimize side effects and pain levels experienced.

Now it is not necessary to go to a clinic or salon if you wish to have IPL hair removal as there are many home devices on the market to choose from, although they are less powerful than those used by professional operators.

IPL treatments in salons, though still relatively expensive, are much more affordable to the general public nowadays, and not just the preserve of the wealthy elite.

How Does IPL Work?

IPL uses polychromatic light (full spectrum) and low-range infrared radiation to target the dark pigment (melanin) found in skin and hair, and which is found in higher concentration around the base of the hair follicle.

The units of measurement for wavelengths of light and infrared radiation are known as nanometers (nms), each nm being equal to one billionth of a meter.

As previously mentioned, filters are used to block the most potentially harmful wavelengths of light, so that a broad wavelength is used (typically between 500 - 1200nm). 

As the light energy is absorbed by the melanin  around the hair root, heat is generated which in turn destroys the papilla, which produces the hair.

This causes the hair to be shed, usually 1 - 2 weeks following treatment.

The aim is to permanently damage the hair follicle sufficiently to prevent hair regrowth.

It is for this reason that IPL is really only suitable for those with a good contrast between skin and hair tone.

If you have pale skin and dark hair, you are the ideal candidate for this type of hair removal.

If your skin tone is too dark, then the risk of the skin absorbing the light and burning becomes greater. 

The table below, developed by Thomas B Fitzpatrick in the mid 70's and named the Fitzpatrick scale after him, is used to classify skin tones in terms of their response to UV light.

If you are in the 1 - 4 range skin tone, then IPL is considered  safe for you.

Skin Type

Skin Colour

Hair Color (darkest)

Eye Colour



White or very pale


Blue, grey, green

Always burns, never tans


Pale white with beige tint

Chestnut or dark blond


Always burns, sometimes tans


Beige to light brown (olive)

Dark brown

Dark brown

Sometimes burns, always tans


Light to moderate brown



Rarely Burns, always tans


Medium to Dark Brown


Brownish black

Rarely burns, tans more than average


Dark brown to black



Never burns

Hair colour is also an important factor, with IPL not being effective for anyone with light blonde, white, grey or red hair.

Is IPL and Laser the Same - What is the Difference?

Strictly speaking, although Laser and IPL both use light rays to target melanin for hair removal and are often lumped together, in fact it is quite different.

Whilst IPL uses broad spectrum light rays, laser is much more targeted, using a specific wavelength of light and pulse duration, depending on the skin and hair type of the individual being treated.

Most home devices actually use IPL technology, one notable exception being the popular Tria 4X, whilst laser treatments are more commonly used in salons nowadays.

In terms of efficacy, there is no clinical data published and readily available to prove that either technology is more effective, despite the many claims that you may read to the contrary and made by various different clinics.

Is IPL Hair Removal Permanent?

This is not as simple to answer as you may think, as there are various factors which may affect the results.

FDA - Permanent Hair Reduction

The FDA (USA Food and Drug Administration), which regulates a very wide range of consumer products, has recognised and approved a number of IPL devices as providing permanent hair reduction.

FDA Logo

The FDA definition of permanent hair reduction is:

"The long term, stable reduction in the number of hairs re-growing after a treatment regime, which may include several sessions.

Permanent hair reduction does not necessarily imply the elimination of all hairs in the treatment area."

Currently, the only method of hair removal classified and approved by the FDA as absolutely permanent is electrolysis.

What Does Permanent Hair Reduction Mean?

According to the FDA's definition "the number of hairs re-growing must be stable over time greater than the duration of the complete growth cycle of hair follicles".

In order to understand this, you need to understand the three stages in the growth cycle of hair:

  • Anagen stage - this is the actively growing stage, during which new hair is produced and grows to its maximum length
  • Catagen stage - this transitional stage is when the hair is detached from the follicle and blood supply.
  • Telogen stage - during this period the follicle remains dormant, until towards the end when the old hair is shed and the anagen growing stage recommences. 

IPL is only effective when hair is in the anagen stage of growth, and only a percentage of hair all over the body is actively growing at any one time.

In addition the hair lifecycles vary in length depending on the area of the body and are also genetically determined, so vary from one individual to the next.

The table below, therefore, can only be used as an indicative guide to rough averages:

Body Part



Cycle Duration


3 months

1-2 weeks

10 months


3 months

1-2 weeks

10 months


10 weeks

2-3 weeks

14 months

Upper Lip

6 weeks

2-3 weeks

5 months


3 weeks

2-3 weeks

5 months


3 months

2-3 weeks

8 months


16 weeks

2-3 weeks

10 months


24 weeks

3-6 weeks

11-12 months

You may conclude from the available evidence that, IPL is effective at reducing hair re-growth (up to 80% reduction), but it will take time and multiple sessions to achieve the desired results.

There is, however, limited clinical data to indicate how long this hair reduction lasts and how often it occurs.

Generally, as a guide only, you are likely to need 6 - 8 sessions initially (depending on the area being treated) with annual follow-ups.

IPL Hair Removal At Home - Pro's and Con's

There are many effective IPL devices available for home use, and they are improving all the time.

So what are the advantages of this type of hair removal in comparison to salon treatments?

  • Cost - top of the list and the most obvious advantage is the cost saving.  The initial outlay will be in excess of $200 for a good home device, and you will need to take into account the cost of any replacement flash cartridges that may be required.  Even so, when set against the cost of numerous expensive salon sessions and follow-ups, there is a substantial saving to be made.
  • Convenience - no need to schedule appointments, you can carry out the treatments whenever you like.
  • Comfort - there is nothing like the comfort of your own home.
  • Privacy - if you are not comfortable with baring all to strangers in a salon, home treatments are your saviour.
  • Trained Professional - in a salon, a trained professional is using the equipment so you are in safe hands.  To carry out treatments at home requires close attention to all instructions and precautions laid out in the manufacturer's manual.
  • More Powerful - the machines used in salons are more powerful than those sold for consumer use, so that results are seen quicker and they may be more effective.
  • Body Area - some areas of the body e.g. the back are impossible to reach at home yourself, so you would need to draught in help.

For the past 12 months, I have been testing and playing with all sorts of hair removal products for Hair Free Life. My goal is to provide the most accurate and up-to-date hair removal consumer information on the internet. When I'm not photographing, reviewing and researching hair removal products I play the drums in a samba band and am a volunteer for the Swindon Lions! Got any questions? Write to us below:

  • Avatar Tim says:

    Why doesn’t it get all the hairs even after several treatments? Do new hair roots form, or do some hairs turn white, or is it just because the light misses some each time and it’s just a case of repeating until you get them all?

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