why take b12 injection Injections Sublingual B12 vs. B12 Injections:

Vitamin D deficiency is strongly associated with myofascial pain syndrome and chronic pain muscle spasms, particularly in populations with limited sun exposure

Mild redness or bruising at the injection site

Trigger neurologic symptoms, such as numbness and tingling in hands and feet, mood changes, anxiety, difficulty walking, disorientation, and memory loss

[1] [5] In post-bariatric patients, these gastrointestinal symptoms may be more pronounced or difficult to distinguish from surgical complications, potentially delaying recognition of serious issues such as bowel obstruction, internal hernia, or anastomotic ulceration