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A comment on Ultraviolet Irradiation of Blood: “The Cure That Time Forgot”? (2018). Parent comment

Re:Ultraviolet Irradiation of Blood: “The Cure That Time For... by rsynnott on Friday April 24, 2020 @01:02PM (#22970343)
That's also not internal; it's on the surface. See https://en.wikipedia.org/wiki/Low-level_laser_therapy
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Re:Ultraviolet Irradiation of Blood: “The Cure That Time For... by Alex3917 on Friday April 24, 2020 @01:10PM (#22970458)
Not a medical expert, but Encyclopedia Britannica seems to say that the nasal cavity counts as an internal space:

https://www.britannica.com/science/nasal-cavity

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