Do not use the medication if you notice dramatic color changes, cloudiness, particles, or precipitation
If you have neurological symptoms (pins and needles, numbness, balance issues), severe fatigue, unexplained weight loss, chest pain, breathlessness, or symptoms that are worsening, you should seek medical assessment promptly.
The frequency of B12 injections varies based on the severity and cause of deficiency: For significant deficiencies or pernicious anemia, daily or weekly shots may be started, then tapered to monthly maintenance doses
The exception is when a buyer wants very fine dose granularity (e.g., 0.25 mg micro-doses) in which case 3 mL of bac water on a 10 mg vial produces lower concentrations and finer per-unit dose increments at the cost of larger injection volumes