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If you are using a supplement that contains biotin, most endocrinologists recommend stopping it at least 3 to 5 days before any blood work

Elevated MMA levels in patients with vitamin B12 deficiency can contribute to myelin damage (myelopathy) and, consequently, peripheral and autonomic neuropathy ( Cobalamin deficiency can lead to neurological manifestations such as progressive axonal demyelination, impaired peripheral and sensory nerve function, areflexia, loss of proprioception and vibration sensitivity, and subacute combined spinal cord degeneration (70)

Specifically amino acids 176191 from the C-terminal region

Watch these videos for a research update from the Huberman Laboratory at Stanford University School of Medicine

If youve been feeling flat or run-down, B12 can sometimes make a noticeable difference