Purchased for long covid. I had no taste or smell. immediate return of these senses with initial use. My taste senses now change on a daily/hourly basis but at least I have some compared to absolutely nothing prior to Arc4Health. I use it every day as I’ve also got pain relief from degenerative disc disease, which I didn’t realise until I stopped using it for a week. My husband also uses it sporadically for lethargy, (he thinks also long covid) which puts him back on track. The Arc4Health is definitely a must with ourselves… I can’t function normally without pain and mobility if I don’t use it, a massive part of my life now.