Vitamin B12 deficiency can be caused by poor diet or malabsorption, leading to fatigue, muscle weakness, and memory problems.

Vitamin B12 is an essential nutrient that's often overlooked. Also known as cobalamin, vitamin B12 helps your body produce vital red blood cells and boost your energy levels, among other things.

Take vitamin B12 on an empty stomach in the morning or early afternoon to maximize absorption and avoid sleep disruptions. Vegans, older adults, and those with certain health conditions affecting ...