b12 injection vertigo Common & Rare Side Effects of Vitamin Injections Vitamin B12 Deficiency in Aging:

Available online at: (Accessed May 9, 2025)

And because anywhere from 1 to 5 mg can be stored, a deficiency that develops from inadequate intake or absorption can take months to years to develop 4

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For example, if your supplement happens to be 10 g, then cutting it in half and taking the resulting 5 g supplement twice a day (at least 4 hours apart) will meet the EFSA recommendations

Early signs include fatigue and weakness, whilst neurological symptoms may appear later if deficiency remains untreated