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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 Alex3917 on Friday April 24, 2020 @12:51PM (#22970192)
> To be clear, this technique does not in any way involve putting a UV source inside the body.

There are people who do it both ways. As another commenter pointed you, you can buy devices that do the same thing that work inside the body:

https://vielight.com/

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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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