For anyone interested - there's actually some evidence that blue light is harmful - it damages mitochondrial DNA and results in free radical production (another good reason to use sunscreen with physical blockers like zinc/titanium?) but the DNA damage is mostly well repaired.
As for red light therapy, it's been proven useful in the treatment of skin disorders, and is also antibacterial, but its effects (from my quick scan of PubMed) seem to be mostly on the surface which makes sense I guess - how is light of this wavelength meant to penetrate into tissues? Would it's potential therapeutic benefits be mostly topical?
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