Understanding What is a functional vitamin B12 deficiency?
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3 min read
Up to 50% of patients with low-normal serum B12 can have metabolic evidence of a functional deficiency, highlighting the need for advanced testing. This phenomenon, known as a **functional vitamin B12 deficiency**, occurs when the body cannot properly utilize the vitamin at a cellular level, even with adequate circulating amounts. It is a critical, yet often overlooked, health condition that can lead to significant neurological complications.
