I'm glad you asked, as I have long been interested not only in oxygen therapies, but all forms of alternative health remediation...
Long ago, I read this book by Ed McCabe:
https://www.amazon.com/dp/0962052701
I tried the hydrogen peroxide therapy, but don't recall any significant results. At one point, McCabe was persecuted by the IRS and imprisoned; perhaps to suppress his ideas?
Later, I built an H2O2 (Brown's Gas) generating machine, and my wife and I breathed Brown's Gas for a while. It infuses your body with both oxygen and hydrogen:
https://hive.blog/technology/@creatr/fountain-of-youth-embarking-on-a-new-maker-adventure
More recently, we've used and clearly benefitted from MMS/CDS (chlorine dioxide). The "Protocol 1000" in that therapy also floods the body with oxygen.
I'd encourage you to look into these and other methods, in addition to the hyperbaric method.😀