I am in Australia so I am not sure how easy it is to access the food grade hydrogen peroxide, food grade only, the other hydrogen peroxides contain other additives. If you have a look on the oxygen therapy forum I think some people have tips on where to buy it.
Oxypowder is the actual name of the colon cleanser, I purchased mine off ebay but it is easily found via web search. I think the cleansing and high dose magnesium that is in Oxypowder have something to do with it.
I have also used Aerobic Oxygen which is slightly different, same principle though. The hydrogen peroxide delivers a higher rate of oxygen I think, don't quote me, just what I read. I am also a smoker so any additional oxygen in my body has got to be a bonus.
I am also researching the body's ph balance in relation to general health which is really interesting, mine is quite acidic rather than alkaline (which is ideal) so for general wellbeing I have also been looking at alkalife drops. Do a search on this product and body ph, some of the info is really interesting and worth a thought.
If you are considering oxygen therapy I highly suggest you check out the oxygen therapies forum for advice and benfits of this kind of therapy.
I am still a newbie to an extent but there are people who have been doing this for years.