Yes, B12 does affect the immune system. B12 is an essential nutrient that is involved in the production of red blood cells, which are responsible for carrying oxygen and other nutrients to the body's cells. B12 also helps in the production of certain white blood cells, which play a role in defending the body from infection and disease. Without adequate B12 levels, the body's ability to fight off infection and disease can be reduced.
Studies have shown that B12 deficiency is linked to an increased risk of contracting certain infections and diseases, including the common cold, flu, and pneumonia. In addition, studies have linked low B12 levels to an increased risk of developing autoimmune diseases, such as rheumatoid arthritis and lupus.
In order to ensure adequate B12 levels, it is important to get enough B12 from dietary sources, such as lean meats, fish, dairy products, eggs, some fortified cereals, and some fortified plant-based milks. People who do not get enough B12 from their diets can also take B12 supplements. It is important to speak with a healthcare provider before taking any supplements, as there may be potential side effects or interactions with other medications.
Overall, B12 is an essential nutrient that plays an important role in the immune system, and it is important to ensure adequate B12 levels through dietary sources and/or supplements.