can b12 injections cause headaches I've had a migraine since Sept 4th. I took a injection that day (prescribed by my doctor) so I'm wondering if it's related or coincidence. I'm scared to take another one Why Do I Feel Worse

In mouse models bearing subcutaneous MM tumors, the radiopharmaceutical showed specific uptake in tumors of various sizes with excellent tumor-to-background contrast, particularly evident at 67 days post-administration

Injection techniques such as intramuscular injection require special care to avoid side effects, including potential nerve damage. Very rare but serious reactionssuch as severe allergy, difficulty breathing, chest pain, or signs of infection at the injection siterequire immediate medical attention

Quality: Its also best to choose a product that has been third-party tested, as this ensures that it has been tested for heavy metals, contaminants, and accuracy of the label

Sometimes its based on known breakdown or severe deterioration of effectiveness