glutathione stransferase deficiency Overexpression of S-Transferases in Human Diseases: Drug Targets and Therapeutic Implications Modulation of Glutathione-S-Transferase by Phytochemicals:
Description
Found that not enough vitamin B12 can cause nerve pain and damage

J Cell Biol 221

Speaking of MTHFR symptoms, there really is not a list perse, because this gene mutation has only been shown to be associated with certain medical and health conditions and not a direct cause

Rubbing can irritate the area and increase your risk of infection

References Carreras-Gallo N, Dwaraka VB, Cceres A, Smith R, Mendez TL, Went H, Gonzalez JR

Oral B12 supplementation generally takes longer to produce noticeable effects than intramuscular injections, with patients typically experiencing improvements within 24 weeks
