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Neurologic symptoms The neurologic symptoms of vitamin B 12 deficiency are myriad and include numbness and tingling of the hands and, more commonly, the feet (peripheral neuropathy)

Hence, these contribute to the reasons for the current inconsistencies in IGF-1 measurements

Theoretical concerns about chronic peptide administration including potential immunogenicity (antibody formation), accumulation in tissues, or long-term effects on neuroendocrine regulation have not been systematically addressed

Also, because B12 is necessary for proper cellular respiration and the formation of red blood cells, this vitamin can help your body transport oxygen and use it more efficiently, resulting in an increased metabolism