Two crucial factors that lead to muscle growth are muscle tension and muscle damage
Most of the time these "side effects" are not a true B12 side effect
+ - It is important to acknowledge that many anonymous online users of BPC-157 report adverse effects, including injection site pain and swelling, joint pain, anxiety, panic attacks, heart palpitations, insomnia, drowsiness, weakness, fatigue, loss of appetite, depression, and anhedonia
In some embodiments, the tympanic membrane is anesthetized by any suitable method (e.g., use of phenol, lidocaine, and xylocaine)
Have your doctor monitor your B12 levels to make sure you are getting enough