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Irritability, anxiety, or sadness tied to hormonal fluctuations

This compound is explored for its ability to reduce oxidative stress and improve mitochondrial efficiency in high-energy tissues

Cyanocobalamin Pharmacokinetics European Journal of Cardiovascular Medicine: Vitamin B12 Deficiency in Long-Term Metformin Users USFDA Adverse Event Reporting System: Vitamin B12 Deficiency Associated with Metformin and PPIs MedRxiv (PNAS Preprint): Patient-Reported Treatment Outcomes in ME/CFS and Long COVID Journal of Neurological Sciences / Nutrients: Cognitive Function and Neuropathy

Its part of a class of banned substances called Non-Approved Substances, a catch-all for potentially performance-enhancing drugs that arent approved by any government regulatory authority