You know that bone-deep exhaustion where you wake up more tired than when you went to bed? Low B12 can cause chronic fatigue that feels like you’re carrying a weighted blanket made of lead. It happens because B12 is essential for making red blood cells, which carry oxygen around your body. When those cells are sluggish, your muscles and organs don’t get enough fuel, leaving you breathless just climbing stairs or walking to the mailbox.
Think of it like this: your body is a car, and B12 is the spark plug. Without it, you’re sputtering along, burning energy inefficiently while the engine coughs.
