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Taking vitamin B12 sublingually may also be a good option for people with a condition called pernicious anemia

They can evaluate you, look at a blood sample, and determine whether you have a deficiency

Absorption of vitamin B 12 is strictly regulated, and the body is not able to absorb more than 24 g/day

A vitamin B12 deficiency can lead to megaloblastic anemia, a condition characterized by a low number of red blood cells that are larger than normal ( Megaloblastic anemia can cause a variety of symptoms and side effects, including ( shortness of breath headache heart palpitations fatigue poor balance memory loss That said, being low in vitamin B12 doesnt always lead to megaloblastic anemia, and many people may only experience mild symptoms like fatigue ( Furthermore, while a deficiency in vitamin B12 may not cause weight gain, it can decrease energy levels and contribute to fatigue, making it harder to stay active and manage your weight