one of the most common nutrient deficiencies involves vitamin B-12, a crucial nutrient for nerve health and the construction of red blood cells that carry oxygen throughout your body.
Vitamin B-12 deficiency is especially common among vegetarians and vegans, but it's also surprisingly common in meat eaters, too. Why? Because vitamin B-12 can only be absorbed in the small intestine, and due to common intestinal ailments, even many meat eaters who consume high levels of B-12 are unable to absorb it in their gut.
This leads to a series of seemingly "mystery" health symptoms that actually have a simple common cause: Vitamin B-12 deficiency!