common reactions include transient pain, erythema, or pruritus at the administration site, along with mild diarrhea, headache, or nausea in a minority of recipients
For example, someone with a leaner build might need a shorter needle to ensure the injection is comfortable and delivered correctly
PMID 39376196
Contact your GP for B12 testing if you have: Symptoms suggesting deficiency (persistent fatigue, pins and needles, memory problems, glossitis) Risk factors for deficiency (vegan diet, gastric surgery, long-term metformin or proton pump inhibitor use) [1] [4] Concerns about whether your current supplementation dose is appropriate Underlying conditions affecting B12 metabolism (kidney disease, liver disease) Unexplained high B12 levels on a blood test when not taking supplements Routine monitoring is essential for patients receiving therapeutic B12 injections
How Long Do the Effects From Each Injection Last
Over a couple of months of steady treatment, people who had tingling or numbness from very low levels may notice gradual improvement