The primary reason injections were developed first is bioavailability
Long-term users of tirzepatide and semaglutide may develop B12 deficiency, so including it in the injection bypasses the absorption issue entirely
In IV therapy, it helps ease muscle tension, reduce migraine frequency, and calm the nervous system
One of the older animal studies found it grew organs rather than the animal: However, the fractional weight of adrenals, gut, kidneys and spleen were significantly increased by LR3IGF-I, but again overall growth was not stimulated
doi:10.1128/msystems.00573-23 Plovier H, Everard A, Druart C, et al
By neutralizing free radicals within the mitochondria, glutathione may help support cellular energy production during a time when you might be feeling more tired than usual