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However, systematic reviews and randomised controlled trials supporting these claims are notably absent from peer-reviewed literature

While this vitamin isnt something that your body naturally produces, there are ways to fill the gaps

Vitamin B12 Injection FAQs Can B12 deficiency symptoms point to other health issues

The most common causes include B12 supplementation (particularly injections), liver disease releasing stored B12, haematological disorders increasing B12-binding proteins, and chronic kidney disease reducing B12 excretion

References Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes

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