Glutathione is well-known for its benefits to the skin
Journal of Pharmacology and Experimental Therapeutics via PubMed (PMID 25187433), 2014 AngIV-Analog Dihexa Rescues Cognitive Impairment and Recovers Memory in the APP/PS1 Mouse via the PI3K/AKT Signaling Pathway (animal study not human evidence)
NAD+ works the same way - IV delivery puts 10-50 times more into your system than other methods
Marras TK, Sanders K, Lipton JH, Messner HA, Conly J, Chan CK
GLUTATHIONE $30 As a powerful antioxidant, glutathione rapidly reduces oxidative stress, bolstering immune response and providing anti-aging benefits by improving skin health and reducing wrinkles
Doctors have traditionally given injections of B 12 to patients with pernicious anemia