Other than short burning/tingling sensation in the nose, no perceivable effects from the active ingredients.
Product is excellent, but I actually ordered hhc spray and not nano but nonetheless :-) very active
After over a month and a half of taking boosted oxygen water daily , I'm a full believer in it's benefits not only to boost me in energy and focus. My body has gained a better cycle for sleep and funcion. Plus throughout the summer I've felt inner cooling refreshment going on any time I'd step out into the heat. Definitely a game changer! Thank you Blitzd!