Laser light that is used in hair loss lasers has a typical wavelength of 650nm and has a clear red shine. In order to be cleared by FDA (class IIIA /IIIR), the diode might not sent out more than 5mW. Compared to a light bulb of 60W there is a 12 000 times difference. But still the diode is extremely effective – it gives out the exact wavelength that the follicle cell can absorb. Higher effect and the result had been worse or even non existing.

The reason for hair lasers being called cold lasers is because no heat is produced as apposed to the IFL lasers (hair removal), where the hair follicles are burned away.
There are many types of hair lasers on the market. Between the different brands there are lots of differences. Not regarding the wavelength 650nm or the effect 5mW, because those are kept by everyone. More so for the quality of the individual laser diodes – cheap ones or more expensive ones. The non expensive diodes differ a lot in wavelength when the diodes gets warm. The wavelength could differ up to +/- ten percent after a couple of hours straight running. And after +500-1000 hours of use there is a permanent shift in wavelength. Also when we measure effect the cheap diodes fail after long use or when heated. 25 percent is not unusual in drop – which means a 5mW diode might only send out 3,75mW – which is disastrous if one wants to be serious.

The way the hair loss lasers work is by photochemical reactions within the cells in the follicle. This process is called biostimulation or photobiostimulation needs exact amount of energy (5mW) and a correct wavelength (650nm) and also continuity in order to work. In human hair growth laser needs to be applied every 48 hours in order to maximize the stimulation of hair growth. More often is of no use but lesser is affecting the results in a negative way.

Inside the cells in the hair follicles there are mitochondria – called the power plant of the cell. Inside the mitochondria is where the laser energy is taken up by some chromoplasts. Molecules (ATP) rich of energy are formed and they make the cells start producing protein and that is what the hair are build of up to 95 percent. The ATP also make the cells multiply in a much faster rate which leads to more building blocks for the hair – the hair grows faster. And there are yet many more reactions starting up which increases the oxygenation of the cells and also multiply the transport of nutrients to within the cell through the cell membrane.

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