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Many people notice improvement in their symptoms within weeks, although neuropathy symptoms can take months to improve

PMID 11713213

Gruber, K., Puffer, B

The rare autosomal recessive disorder Immerslund-Grasbeck (IGS) disease is caused by mutations in either the gene Amnion Associated Transmembrane Protein (AMN) or Cubilin (CUBN) gene responsible for the synthesis of cubam receptors (Sobczynska-Malefora et al., 2021)

Because of the effort needed to reduce cyano B12 to an active form, its absorption rate varies greatly between people

Comprehensive preclinical safety evaluations across multiple animal models demonstrate favorable tolerability profiles with excellent safety margins for investigational research applications