Some compounding pharmacies sell bacteriostatic water directly
For more detailed guidance on injection site selection and rotation, see our guide on where to inject retatrutide
The most common side effect is irritation at the site of injection which could last up to 5-10 minutes
Of course, chronic conditions or severe injuries may take longer to show noticeable improvements, sometimes up to 6 weeks
For some people, they are debilitating enough to require dose reduction or discontinuation
In rare situations, B12 shots itching rash anaphylaxis, a life threatening condition that can cause a fast heartbeat and difficulty breathing Other side effects that can occur include: shortness of breath, fast weight gain, and swelling congestive heart failure, the inability of the heart to adequately pump blood pulmonary edema, the buildup of fluid in the lungs peripheral vascular thrombosis, the obstruction of a vein with a blood clot hypokalemia, low potassium levels that can cause irregular heartbeats and muscle weakness fever tingling, numbness, and joint pain swollen tongue polycythemia, an increase in the red blood cell mass Additionally, B12 B12 shots are not necessary for weight loss