From what I could read, it sounded like they used them in tandem, but apparently they can be done alone. LED supposedly helps chronic pain.

I am always extremely skeptical of things, but this is from an academic center.

I will see what else I can find on it.

From my point of view, I am just thinking that O2 would could be regenerative, and even using it nightly would offer potential for mitigation of symptoms. Anyway....I will keep looking to see what I come up with.