But if you are deficient, correcting that deficiency can restore the energy and metabolic function that low B12 drains, and that can make weight loss easier
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The multi-dose vials and single-patient-use KwikPen each contain 4 doses: Single-dose Pen or Vial 2.5 mg/0.5 mL 5 mg/0.5 mL 7.5 mg/0.5 mL 10 mg/0.5 mL 12.5 mg/0.5 mL 15 mg/0.5 mL Multi-dose Vial (4 doses per vial) Dose per Injection Total Strength per Total Volume Strength per mL 2.5 mg/0.6 mL 10 mg/2.4 mL 4.17 mg/mL 5 mg/0.6 mL 20 mg/2.4 mL 8.33 mg/mL 7.5 mg/0.6 mL 30 mg/2.4 mL 12.5 mg/mL 10 mg/0.6 mL 40 mg/2.4 mL 16.7 mg/mL 12.5 mg/0.6 mL 50 mg/2.4 mL 20.8 mg/mL 15 mg/0.6 mL 60 mg/2.4 mL 25 mg/mL Single-Patient-Use KwikPen (4 doses per KwikPen) Dose per Injection Total Strength per Total Volume Strength per mL 2.5 mg 10 mg/2.4 mL 4.17 mg/mL 5 mg 20 mg/2.4 mL 8.33 mg/mL 7.5 mg 30 mg/2.4 mL 12.5 mg/mL 10 mg 40 mg/2.4 mL 16.7 mg/mL 12.5 mg 50 mg/2.4 mL 20.8 mg/mL 15 mg 60 mg/2.4 mL 25 mg/mL 10 OVERDOSAGE In the event of an overdosage, contact the Poison Help Line (1-800-222-1222) or a medical toxicologist for additional overdosage management recommendations

These side effects are more common when you first start taking the medication or when your dosage is increased
Report of the Committee on Growth Hormone Use of the Lawson Wilkins Pediatric Endocrine Society, May 1985