concentration of b12 in injected form Vitamin Monthly Injection: Typical Dose & Schedule B-12 Compliance Injection: Package Insert

After a B12 injection, you may notice improved energy, less fatigue, and better concentration

Updated July 17, 2026 Receive Daily Availability Emails 1 Gram/10 mL(100 mg/mL) 10 mLSingle-dose vial 20% 4 mL vial 10% 250 mg/mL 20 mLMultiple-dose vial 20 mL Multiple-dose vial 0.4 mg/mL 1 mLSingle-dose vial 1 mg/mL 6 mg/mL 5 mL Multiple-dose vial 5 mLMultiple-dose vial 250 mg/mL (125 mg/mL Caffeine) 2 mL Single Dose Vial 500 mg Single-dose vial 1000 mcg/mL 1 mLMultiple-dose vial 30 mLMultiple-dose vial 10 mLMultiple-dose vial 20 mg/2 mL(10 mg/mL) 2 mLSingle-dose vial 5 mg/2 mL(2.5 mg/mL) 2 mLSingle Dose Vial 30 mg/30 mL (1 mg/mL) 30 mL Multiple-dose vial 20 mg/mL 40 mg/mL 1 g/mL 1.5 mLSingle Dose Vial 0.2 mg/mL 5 mLMultiple Dose Vial 20 mLMultiple Dose Vial 1 mLSingle Dose Vial 1 mL Single-dose vial 25 mg/mL 50 mg/mL 750 mg iron/15 mL 15 mL Single-dose Vial 100 mg iron/2 mL 2 mL Single-dose Vial 1000 mg iron/20 mL 20 mL Single-dose Vial 1 gram/5 mL (200 mg/mL) 5 mLSingle-dose vial 4 grams/20 mL(200 mg/mL) 20 mLSingle-dose vial *Each mL contains zinc 1,000 mcg, copper 60 mcg,manganese 3 mcg, and selenium 6 mcg * 2.5 mg/mL 10 mLSingle Dose Vial 5 mg/mL 10 mg/Vial Single Use Vial 100 mg/vial Single-dose Vial 30 mg/mL Phosphorus 15 mmol/5 mL and Potassium 22 mEq/5 mL 5 mL Single-dose,plastic vial Phosphorus 45 mmol/15 mL and Potassium 66 mEq/15 mL 15 mL Single-dose, plastic vial Phosphorus 150 mmol/50 mL and Potassium 220 mEq/50 mL 50 mLPharmacy Bulk Package, plastic vial 50 mg/10 mL 10 mLSingle-dose ampule 600 mcg/10 mL 10 mLPharmacy Bulk Package Vial 12 mcg/2 mL 15 mM P/5 mL (3 mM P/mL)containing 20 mEq Na+/5 mL(4 mEq/mL) 5 mLSingle-dose,plastic vial 45 mM P/15 mL (3 mM P/mL)containing 60 mEq Na+/15 mL(4 mEq/mL) 15 mLSingle-dose,plastic vial 150 mM P/50 mL (3 mM P/mL)containing 200 mEq Na+/50 mL (4 mEq/mL) 50 mLSingle-dose,plastic vial *Each mL contains zinc 3 mg, copper 0.3 mg, manganese 55 mcg, and selenium 60 mcg 20 Units/mL 10 mL Multiple-dose vial 200 mg/10 mL(20 mg of Elemental Iron/mL) 50 mg/2.5 mL(20 mg of Elemental Iron/mL) 2.5 mLSingle-dose vial 100 mg/5 mL(20 mg of Elemental Iron/mL) 3 mg/mL 5 mLPharmacy Bulk Package Vial 10 mL Pharmacy Bulk Package Vial For a list of patents protecting American Regent products, please click here

Many people notice changes in energy, appetite signals, or sleep before they notice anything on the scale, and those early shifts are meaningful because they support the habits that drive real results

If you're experiencing symptoms of deficiency or looking for a proactive wellness solution, these vitamin injections could be the key to feeling your best