fatigue after b12 injection Vitamin Shot exhausted after b12 injection Benefits

Its molecular target is nicotinamide N-methyltransferase (NNMT), a cytosolic S-adenosyl-L-methionine-dependent methyltransferase that converts nicotinamide to 1-methylnicotinamide, consuming SAM and releasing S-adenosylhomocysteine

Last reviewed: June 11, 2026 Last updated: June 11, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

A word on why once daily is the anchoring frequency rather than something more elaborate

[DOI] [PubMed] [Google Scholar] 15.Buvinic S., Balanta-Melo J., Kupczik K., Vasquez W., Beato C., Toro-Ibacache V

What the evidence does support is this: B12 deficiency causes fatigue and neurological symptoms, and correcting deficiency in people who are deficient improves those symptoms