Yesterday I received an oxygen concentrator. I have been testing it for a day.
The model I mentioned is
HERE.
At the time that post was published, both the price was the same and the product was available.
So it turned out to be inexpensive. Similar models usually cost more.
The device is compact. Heavy.
1 liter per minute. There is no need for more. And there is certainly no point in paying extra for a higher flow rate either.
Just what I need.
Beautiful and convenient.
Oxygen noticeably flows in a stream from the hose. I feel like an astronaut flying to Mars
The first thing you notice is the brain. You can literally FEEL it, all of it and completely. The video in the first post includes one of a young man's experiments.
Gradually, this effect disappears as the brain gets used to receiving enough oxygen.
I can say for certain that endurance increases. That is, all physical parameters feel higher.
I repeat once again: I am not a doctor, so whatever you do is your choice.
I am only speaking about my own experience here.