Vitamin B12 is an essential nutrient that helps the body produce red blood cells, support healthy nerve function, and maintain DNA. Since the body cannot make vitamin B12 on its own, it must be obtained through food or supplements. It is naturally found in animal-based foods such as meat, fish, eggs, and dairy products. People who avoid these foods, including some vegetarians and vegans, may be at greater risk of deficiency if they do not consume fortified foods or take supplements.
One of the earliest signs of vitamin B12 deficiency is persistent fatigue. This often happens because the body cannot produce enough healthy red blood cells to carry oxygen efficiently. Other common symptoms include weakness, shortness of breath, dizziness, and difficulty concentrating, which are frequently mistaken for stress, poor sleep, or a busy lifestyle.
As the deficiency becomes more severe, additional symptoms may appear, including pale or yellowish skin, a sore or swollen tongue, mouth discomfort, and tingling or numbness in the hands and feet. Vitamin B12 deficiency can also affect the nervous system and mental well-being, leading to forgetfulness, irritability, reduced focus, or slower thinking in some people.
A simple blood test can check vitamin B12 levels and help identify a deficiency. Treatment depends on the underlying cause and may involve increasing vitamin B12-rich foods, taking oral supplements, or receiving vitamin B12 injections prescribed by a healthcare professional. Early diagnosis and treatment can help prevent complications and restore healthy vitamin B12 levels.