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Then why does cyano B12 even exist

On the other hand, those with methylation issues (MTHFR gene mutations carriers, for instance) do best on methylated B12, that is, methylcobalamin

Mood-related symptoms of B12 deficiency include persistent irritability, low mood or emotional flatness that doesn't respond to typical coping strategies, restlessness, difficulty concentrating, and a general sense of being "off" that's hard to articulate

For example, some evidence suggests that some peptides in eye creams that stimulate collagen could possibly help skin appear more youthful
