Anemia, characterized by pale or jaundiced skin, is another potential sign, as vitamin deficiency can affect red blood cell production
Within the Vitamin B complex, there are several members, including Vitamin B1 (thiamine), Vitamin B2 (riboflavin), Vitamin B3 (niacin), Vitamin B5 (pantothenic acid), Vitamin B6 (pyridoxine), Vitamin B7 (biotin), Vitamin B9 (folate), and notably, vitamin B12 (cobalamin)
Feeling constantly drained, foggy, or just not yourself
Deficiencies can occur with medical conditions such as atrophic gastritis (which causes thinning of the stomach lining), pernicious anaemia, Crohns disease, celiac disease, lupus, or other immune system disorders and certain medications