This guide compares the two vendors across the criteria that actually determine value for a research buyer: payment flexibility, shipping policy, pricing on commonly-stocked compounds, purity testing transparency, customer support, return policy, proprietary product availability, and recent customer sentiment
I also inject B12 daily as I have severe neurological symptoms Subcut is definitely easier and far less painful
B12 injections can provide a natural energy boost by aiding in the conversion of food into usable energy
Consider ease of use for end-users (patients or clinic staff) and overall durability
While vitamin B12 deficiency is common and well-understood, elevated B12 levels can occasionally occur
(PubMed) Smith AD, Smith SM, de Jager CA, et al