Had Hyperberic 60 treatments 2 hrs a day 5 days a week for 6O days in a see through tube technician in between rash tube very comfortable breathing 100 percent oxygen saved my voice box after 35 radiation treatments that severely damaged it and 7 chemo 4 hr sessions .I firmly believe in Hyperberic and would strongly recommend it to everyone that’s has radiation damage or dietetic soars that won’t heal .