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Tuna Another popular, nutrient-rich fish is tuna, which can also add lots of B12 to your diet

You may feel like youre ok, but your reaction times will be slower than normal, and your concentration will be reduced

Foods such as seaweed, spirulina and fermented products are sometimes promoted as natural plant sources, but the forms of vitamin B12 they contain are often inactive and cannot be relied upon to meet human nutritional needs

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In fact, if you don't have a B12 deficiency or an underlying health condition that places you at risk of a deficiency, you will see no benefits from high dose B12 shots, says Dr