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Understanding HairCycle is Essential in Treating Hair Loss
Last Updated: 6 Nov 2025
Understanding the hair cycle, is essential when receiving treatment for hair loss. It ensures that therapies are accurately targeted, respect the natural roles of hair, and support healthy regrowth without causing unintended damage. Without this knowledge, treatments may be ineffective or even harmful, leading to poor outcomes.
Human hairs do not grow all the time, but in phases or returning cycles. Different hairs would have different cycle. During a human life, the growth cycle of a scalp hair will repeat itself on average 20 times from birth on. Scalp hair cycle consists of the following 5 phases.
Laser Therapy, also referred to as Low Level Laser Therapy ( LLLT ), cold laser therapy, photobiomodulation, biostimulation, and phototherapy, has been shown in thousands of peer-reviewed publications to increase cellular survival, proliferation and function. The laser light after absorbed by mitochondria in the cell produces the following actions
The question is no longer whether light has biological effects but rather how energy from therapeutic lasers and LEDs works at the cellular and organism levels and what the optimal light parameters are for different uses of these light sources.
One important point that has been demonstrated by multiple studies in cell culture, animal models and in clinical studies is the concept of a biphasic dose response with the total delivered light energy density ( fluence ).
The reason why the technique is termed Low-level is that there exists an optimal dose of light for any particular application, and dose lower than this optimum value, or more significantly, larger than the optimum value will have a diminished therapeutic outcome, or for high doses of light a negative outcome may result.
The methods for delivering the therapeutic light are diverse. The field is characterized by a variety of methodologies and uses of various light sources ( lasers, LEDs ) with different parameters ( wavelength, output power, continuous-wave or pulsed operation modes, pulse parameters, polarization state etc ). In 2002 MicroLight Corp received 510K FDA clearance for the ML 830-nm diode laser for treatment of carpal tunnel syndrome.
There were several controlled trials reporting significant improvement in pain and some improvement in objective outcome measures. Since then several light sources have been approved as equivalent to an infra-red heating lamp for treating a wide-range of musculoskeletal disorders with no supporting clinical studies.
The methods for delivering the therapeutic light are diverse. The field is characterized by a variety of methodologies and uses of various light sources ( lasers, LEDs ) with different parameters (wavelength, output power, continuous-wave or pulsed operation modes, pulse parameters, polarization state etc). In 2002 MicroLight Corp received 510K FDA clearance for the ML 830-nm diode laser for treatment of carpal tunnel syndrome.
There were several controlled trials reporting significant improvement in pain and some improvement in objective outcome measures. Since then several light sources have been approved as equivalent to an infra-red heating lamp for treating a wide-range of musculoskeletal disorders with no supporting clinical studies.
The methods for delivering the therapeutic light are diverse. The field is characterized by a variety of methodologies and uses of various light sources ( lasers, LEDs ) with different parameters ( wavelength, output power, continuous-wave or pulsed operation modes, pulse parameters, polarization state etc ). In 2002 MicroLight Corp received 510K FDA clearance for the ML 830-nm diode laser for treatment of carpal tunnel syndrome.
There were several controlled trials reporting significant improvement in pain and some improvement in objective outcome measures. Since then several light sources have been approved as equivalent to an infra-red heating lamp for treating a wide-range of musculoskeletal disorders with no supporting clinical studies.
conditions of use
Information provided on this website is for educational purposes only and is not intended as medical advice. It should not be interpreted as promotional material or as claims of superiority over other techniques or providers.
Individual results may vary, and no outcome can be guaranteed. Always consult with a qualified healthcare professional before making any decisions about medical treatment.
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Our practice adheres to guidelines established by leading international organizations in Hair Restoration.
International Society of Hair Restoration Surgery is the leading global medical association that establishes international practice standards and patient safety protocols.
The American Board of Hair restoration Surgery represents the highest standard. To maintain rigorous certification requirements the physician must demonstrate surgical expertise.
Worls FUE InstituteI serves as the premier educational body focused exclusively on Follicular Unit Extraction methodology. The institute ensures consistent application of safe FUE.
