Known to work

Vitamin B12 in health and disease - 2010 University of Sydney
Vitamin B12 status is associated with bone mineral content and bone mineral density - 2003 Wageningen University
Vitamin B12, Folic Acid, and the immune system - 2019 Victoria University
The role of vitamins and minerals in energy metabolism and well-being - 2007 The Journal of International Medical Research
A review of Vitamin B12 in dermatology - 2015 American Journal of Clinical Dermatology

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