There are, however, two studies that we can call on: Pentadecapeptide BPC 157 Interactions with Adrenergic and Dopaminergic Systems in Mucosal Protection in Stress (link) This study wasnt designed to find the comparison between two administration methods, but it did look at how different systems of the body would affect these two methods
B12 plays a role in energy production by assisting in the metabolism of fats and proteins
B12 is stored quite well by the liver, so sometimes we dont see low levels on bloodwork even in someone who might be experiencing low intracellular levels of B12
But inject them for 15 years, like a 10 or 20 day course per year
The B12 injection service is designed to make the process of getting a B12 injection safe and simple
Can be combined with minoxidil or finasteride to enhance results, since it works through entirely different mechanisms