I've attended a seminar (small one) and the topic is about c02 treatment, what I understand is, The introduction of CO2 is to trigger the body to pump more oxygenated blood all throughout our body. Improving our microcirculation would definitely result in a plethora of positive effects (due to the fact that more o2 and nutrients reach the littlest blood vessels in our body).
Also, Bad circulation is not common, especially in young persons. It often targets the elderly, middle-aged, and those suffering from different conditions including diabetes and atherosclerosis
Therefore, by improving blood circulation we can maintain the acceptable number of our blood sugar and that is of course with the help of C02. Also, c02 is actually FDA approved (FACT)