Hi.
I signed up on this forum so I could throw in my two cents about this specific discussion. First of all I'd like to make it known that I have UC and not Crohns, I know the two are different enough that what I say may not matter, you'll have to decide that for yourself.
I had my own life altering experience using light-therapy, specifically red-light-therapy of the 640 nm (non-UV) range. If my experience is any indication, it does work. It worked so well, that I had a complete turn around in roughly two weeks. I could eat ANYTHING, and did. Though my symptoms were essentially gone, it's important people realize that I was not cured.
If you want to boil it all down to it's essence, all auto-immune related diseases are linked to the mitochondrial-DNA/mtDNA being damaged or mutated. If you have an auto-immune illness such as Crohns or UC, it's because enough of your mitochondria are impaired, which causes serious health problems, accelerated aging, etc. The so called modern diet is a big culprit but there are other factors as well. This is why some have had success using antioxidants such as natural vitamin-e, but getting your body to use it where it will do the most good is tricky.
What the light does is super-charge/feed your mitochondria so they can go to work doing what they normally are supposed to. I did not use this directly on the area of my illness, (nor any area that had bacteria I wanted to protect like my stomach, mouth, neck, etc.) but experienced a systemic effect. As to how effective it is at outright fixing your mtDNA, I can't say for sure. I was healed for sure, but I don't know to what level, how deeply it effected me.
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As far as light therapy in a pill is concerned... I think it's a terribly irresponsible use of it. We have very fragile bacteria in our gut that we need, and red/blue ranges of light are infamous for there destructive power on bacteria. It's incredibly difficult if not impossible to replace them. It may help with your health in the short term, but at what cost? Short of fixing Cancer, I would not use light therapy this way.
Apologies for my post being so long.