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In sum: Serum vitamin B12, homocysteine and methylmalonic acid levels are good indicators of your vitamin B12 status

L.DelgadoM

10.1016/j.biopsych.2015.04.005 [DOI] [PubMed] [Google Scholar] Mandal P

Vitamin B12 also helps to regulate brain activity and is involved in the production of the myelin sheath around the nerves and the conduction of nerve impulses

Regularity and consistency are key, whether taken in the morning or evening, with or without meals
Davalos M, Konno S, Eshghi M, Choudhury M
