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Researchers assess potential toxicity by administering different doses of these peptides to animal models and monitoring any adverse effects

Consult your doctor before starting IV therapy during pregnancy

People over 60 are most likely to have B12 deficiency

The same is true of B vitamin complex supplements, which deliver 50 to 500 micrograms (i.e., 20 to 200% of the RDA), as well as for most supplements containing only vitamin B12, which deliver up to 1,000 micrograms (about 400% of the RDA)

Known as intranasal peptide sprays, this method alters the delivery and absorption of peptides