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The standard schedule is a starting point, not a strict rule The 2024 NICE guideline NG239 on B12 deficiency in over 16s makes an important point: the optimal route, dose and frequency of B12 replacement have never been firmly established, and have often followed custom and historical practice
Allow the vial to reach room temperature, then slowly inject 2.0 mL of bacteriostatic water down the vial wall
1 2 "Vitamin B12: A review of analytical methods for use in food"
B12 injections are safe and are not known to harm health in any way when taken under the supervision of a medical professional
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