Scientists have found that closing the nasal passage may reduce the metallic taste from iron but not from other minerals
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You may also be more likely to develop vitamin B12 deficiency if you have: Atrophic gastritis, in which your stomach lining has thinned Pernicious anemia, which makes it hard for your body to absorb vitamin B12 Conditions that affect your small intestine, such as Crohn's disease, celiac disease, bacterial growth, or a parasite Immune system disorders, such as Graves' disease or lupus You can also get vitamin B12 deficiency if you follow a vegan diet (meaning you don't eat any animal products, including meat, milk, cheese, and eggs) or you are a vegetarian who doesn't eat enough eggs or dairy products to meet your vitamin B12 needs
When you say it doesn't prove you cant utilise b12 from.stores in the liver what does it prove if symptoms return then relieved by a b12 injection then
Supplements of FOLIC ACID are reported to improve antibody response in animals