Ever Feel Tired and Irritable? You Might Be Missing This Vitamin

If you find yourself getting a good night's sleep yet still feeling tired during the day—and occasionally irritable—you might want to check if certain vitamins are missing in your system, particularly Vitamin B12.

Vitamin B12 is essential because our bodies can't produce it on their own. We need to obtain it externally, whether through the food we eat or through supplements. The main roles of this vitamin include the production of red blood cells, maintenance of the nervous system, and building of DNA cells in our body.

Foods rich in Vitamin B12 include eggs, fish, poultry, dairy products, and beef. The reason it's scarce in other sources is that just like humans, animals and plants don't produce it themselves.

Yeast, mold, bacteria, and algae do have the capability to produce Vitamin B12 on their own. Believe it or not, even the bacteria in our digestive system produce this vitamin. However, since this production occurs in the large intestine, it doesn't get absorbed into our bloodstream (absorption happens in the small intestine).