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Oral Sprays: A quick spray inside your cheek works in a similar way to sublingual drops, using the blood supply in the mouth for fast absorption
Staying well-hydrated is crucial, particularly if experiencing vomiting or diarrhea, though large volumes of fluid with meals should be avoided as this may worsen symptoms
[41] [42] Functional vitamin B 12 deficiency can also develop with heavy regular use of nitrous oxide N 2 O, also known as "laughing gas", by oxidizing the cobalt atom and inactivating the vitamin
When B12 levels become problematic: High-dose supplementation (particularly doses exceeding 1,000 micrograms daily) Frequent B12 injections without medical supervision Underlying conditions affecting B12 metabolism Concurrent use of multiple B12-containing supplements The NHS does not set an upper safe limit for vitamin B12 because harmful effects from excessive intake have not been definitively established
