LLLT Study shows hair growth

Here is the article, you judge for yourself.  These units are expensive and from what I hear, the benefits are marginal. One of the problems with LLLT is the distance from the scalp and the amount of hair between the LLLT and the scalp. The longer the distance and the more hair, the less effective it will be.  I would conclude that a shaved head would give the best response and should be tested:  https://journals.lww.com/md-journal/FullText/2020/07170/Low_level_light_therapy_using_a_helmet_type_device.73.aspx