The honest answer is that a raised B12 on its own usually causes none: any symptoms you do have are far more likely to belong to whatever caused the elevation than to the vitamin
Underlying health conditions create additional complexity
For larger vials you can use up to 5 mL more bac water makes microdosing easier, but insulin needles usually max out at 1 mL per injection
Stacking BPC-157 with other peptides, most commonly TB-500 (thymosin beta-4), has become prevalent in sports medicine circles
Common adverse effects include gastrointestinal symptoms such as nausea, vomiting, diarrhea, and constipation, which typically diminish over time with continued use and gradual dose escalation
When coupled with any of the above supplements, large-dose magnesium has the potential to increase the risk of bleeding in patients on blood-thinning medications