According to the Mayo Clinic, most people consume adequate amounts of B vitamins through their diet, though the elderly, particularly those with pernicious anemia, athletes, strict vegetarians, and people who consume a lot of alcohol may be deficient in the B vitamins and may require injections or oral supplementation of B vitamins or vitamin B-12, in particular
Long-Term Health Benefits of Vitamin B12 Injections In addition to the immediate effects, vitamin B12 injections offer long-term benefits such as supporting nerve health, improving cognitive function, and aiding in red blood cell production
These vitamins play an essential role in the metabolic processes of both the central nervous system (CNS) and the peripheral nervous system (PNS)
Kinetic and physiological effects of alterations in homologous isocitrate-binding [PMID: 11714283] Laboratory literature summary: Kinetic and physiological effects of alterations in homologous isocitrate-binding sites of yeast NAD(+)-specific isocitrate dehydrogenase
You have to consume food and drinks that have vitamin B12 to get it
Those publications include fewer than 40 actual humans, there is no identified high-affinity receptor for BPC-157 in the human body, and no randomized trial has ever demonstrated any evidence that it works