How effective is red light at preventing hair loss?

[Deleted member 1901]

“Comparing the results at baseline and week 16, the experimental group showed an increase in hair density of 41.90 hairs/cm2and an increase in hair thickness of 7.50 μm”

So 42 extra hairs per cm^2

 

[Deleted member 23558]

very good, especially if you take anti prolactin drugs and apply topical progesterone on hair.