The most common causes include B12 supplementation (particularly injections), liver disease releasing stored B12, haematological disorders increasing B12-binding proteins, and chronic kidney disease reducing B12 excretion
S-Acetyl L-Glutathione is used for treating cataracts, glaucoma, preventing aging, treating or preventing alcoholism, asthma, cancer, heart disease (atherosclerosis and hypercholesterolemia), hepatitis, liver disease, immunosuppression (including AIDS and Chronic Fatigue Syndrome), maintaining immune function, memory loss, Alzheimers disease, osteoarthritis, Parkinsons disease, people with ASD, detoxifying metals and drugs, cystic fibrosis, for preventing toxicity of chemotherapy, for treating male infertility, for preventing anaemia in patients undergoing haemodialysis, preventing renal dysfunction after coronary bypass surgery, shown to selectively induce apoptosis (cell death) in human lymphoma cancer cells
So it's actually a lab made peptide
Rahman, I., Mulier, B., Gilmour, P.S., Jeffery, P.K
A Closer Look at B12s Role in Fat Mobilization Fat loss involves more than simply burning calories
Build gradually to 30 to 60 minutes most days