b12 injection site nhs How to self-inject intramuscular vitamin - Overview B12 injections: who needs them
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The same happened with my wife, but she had a more severe case along with tachycardia

Deficiency may cause fatigue, neurological symptoms, and cognitive changes, with treatment often improving symptoms when deficiency is present
[DOI] [PMC free article] [PubMed] [Google Scholar] 3.Pandey A., Chawla S., Guchhait P

You can learn more about the clinics full range of injectable nutrient services in our complete guide to vitamin deficiency injections, costs, and insurance coverage
It is more frequent among older adults, vegetarians, vegans, individuals with gastrointestinal disorders, and during pregnancy when requirements increase

NHS website
