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[DOI] [PubMed] [Google Scholar] 130.Stanelle S.T., McLaughlin K.L., Crouse S.F

J Psychiatr Ment Health Nurs 15:424434 Tardiolo G, Bramanti P, Mazzon E (2018) Overview on the effects of N-Acetylcysteine in neurodegenerative diseases

But if you want to look for the symptoms then see this list below Signs of B12 deficiency include: Fatigue or low-energy Hair loss Weight gain Brain fog Depression Numbness/tingling Tongue changes Constipation Heart palpitations Anemia Because many of these symptoms can be masked by a low thyroid many people are tempted to check their serum B12 levels Testing for Vitamin B12 Deficiency: Do you Really Need to

BMC Pharmacol Toxicol (2014) 15:70

References Adler V, Yin Z, Fuchs SY, Benerza M, Rosario L, Tew KD, Pincus MR, Sardana M, Henderson CJ, Wolf CR, Davis RJ and Ronai Z