what glutathione does to your body IV Therapy: Benefits & Uses Glutathione Whitening Pills - 120
Description
The only PK study (Awosemo 2021) tested IV and oral, never sub q

Science 204:407410 Murphy MP (2009) How mitochondria produce reactive oxygen species

Journal of the International Society of Sports Nutrition 2 , 3844, doi:10.1186/1550-2783-2-2-38 (2005)

Therefore, oral B12 supplements can be taken with or without food with minimal impact on absorption

Hesselink MK

All of them will work, but some will just be more comfortable to use
