Heres the kicker: blood serum B12 tests are unreliable , especially in people who have been supplementing (even just with a multivitamin)
We also typically recommend cycling peptides, using them for a set period followed by a break, to maintain the bodys sensitivity and maximize results over the long term
Its cost-effective, which is why its widely used, but your body has to convert it into an active form it can use
How often you need B12 injections depends on how severe your deficiency is and why you have it
This pushes any bacteria away from the area where the needle will enter
Not all medications and nutrients are small enough to get absorbed or need breakdown via gastric enzymes for activation for the sublingual route, but whenever possible there is a benefit to using this route as it bypasses potential damage/absorption issues in the GI tract