Given that regeneration is driven by stem cells, it would make sense to look for changes in stem cell activity underlying known methods for improving natural healing processes. Here, via Medical News Today, news that this is the case for hyperbaric oxygen treatments: "a typical course of hyperbaric oxygen treatments increases by eight-fold the number of stem cells circulating in a patient's body. ... We reproduced the observations from humans in animals in order to identify the mechanism for the hyperbaric oxygen effect. We found that hyperbaric oxygen mobilizes stem/progenitor cells because it increases synthesis of a molecule called nitric oxide in the bone marrow. This synthesis is thought to trigger enzymes that mediate stem/progenitor cell release." This would seem to open the door on a number of possible ways to greatly amplify existing healing processes.