The systematic review notes that anywhere between 12% and 58% of ergo-nutritional supplements are contaminated with other, oftentimes unsafe, substances. Research peptides operate with even less oversight than supplements
The afferent input generated by formalin is believed to release excitatory amino acids and peptides as inflammatory signaling molecules, which, through NMDA and NK1 receptors, initiate a cascade
However, it is believed that oral vitamin B12 can be absorbed passively independent of intrinsic factors
The mechanisms are fundamentally different, and that difference has significant clinical implications
Symptoms can include tiredness, lethargy, a sore mouth, being faint, and breathlessness
It is literally non-toxic