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Several factors influence the choice of needle and syringe: Type of injection : Intramuscular (IM) or subcutaneous (SC) Gauge of the needle : Diameter of the needle Length of the needle : Determines the depth of injection Volume of the syringe : Determines the amount of B12 to be injected 3
Vitamin B3 (Niacin)
Older adults, vegans, individuals with gastrointestinal conditions, and those taking metformin or proton pump inhibitors often require higher doses or supplementation
People who are vegan or vegetarian are generally advised to take a vitamin B12 supplement rather than relying on fortified foods. In most cases, Romito says most people should seek to get their B vitamins from foods rather than from supplements
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