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Suitable for Oral Therapy Replacement Cases It is beneficial when oral vitamin supplementation is not possible or effective, such as in critically ill patients, ICU cases, or severe vomiting

If you experience any concerning symptoms while taking B12 supplements, report them to your healthcare provider and consider reporting suspected side effects via the MHRA Yellow Card Scheme (yellowcard.mhra.gov.uk)

There is limited evidence that high vitamin B12 levels directly cause dizziness or fatigue

This is especially true when the vitamin status is poor during the pregnancy and if the early-introduced foods fed to the still-breastfeeding infant are vegan

A pharmacokinetic study in rats found that oral administration produced substantial plasma concentrations, with a maximum concentration of 2252 ng/mL and an elimination half-life of approximately 6.9 hours

Theoretical and route-specific risks FDA's 2024 review specifically flagged that no published human exposure data exists for the subcutaneous, transdermal, or intranasal routes that compounding pharmacies have offered