It is a place of transition between two worlds: the extreme high altitude and the lower valleys
Clinical research suggested doses in the range of 1-10mcg per kilogram of body weight showed efficacy, though most protocols standardized around 4-6mcg/kg for practical application
Freedman JE, Loscalzo J, Barnard MR, Alpert C, Keaney JF, Michelson AD, et al
Also, for people who dont eat meat and dairy at all, the latter is definitely advised, as you simply cant eat the amount of meat and dairy alternatives to get enough B12 (unless youd like to eat 1,5 containers of fortified soy yoghurt each day)
If you dont have a deficiency and youre just doing it because its trendy, you are putting a serious stain on your organs and if you have a misdiagnosed heart or kidney problem, you could make it worse or cause serious problems