You might eat well on paper but still struggle if your body doesn’t fully use the B12 you consume. That’s why symptoms can feel confusing and hard to pin down.
But here’s the good news: recognizing patterns early allows for straightforward evaluation. Let’s look at eight signs people often miss or dismiss.
Sign #1: Persistent Fatigue That Doesn’t Improve with Rest
You get a full night’s sleep, yet still drag through the day like you’re carrying extra weight. Tasks feel harder, and energy crashes come without warning.
Many describe it as a constant “low battery” feeling. Studies link this to how B12 supports oxygen delivery via red blood cells—when that’s inefficient, exhaustion lingers.
One common story: a busy professional in her 50s blamed work stress for years until a routine check revealed low B12. After addressing it under medical guidance, her stamina gradually returned.
