Vitamin B12 is one of the many nutrients our bodies need - especially considering we can't make it ourselves.
Our bodies require vitamin B12 to makes healthy red blood cells, release energy from food, and produce DNA. We can get enough our recommended daily dose of 2.4 micrograms from eating vitamin B12-rich food like meat, fish, and eggs or by taking supplements.
Not getting enough of it can lead to a deficiency that can show up as tiredness, fatigue and even a sore and red tongue.
