Vitamin B12 plays a key role in keeping your body energized and your brain functioning properly. If you’re often feeling tired, weak, or unusually sluggish—even after a good night’s sleep—it might be due to a B12 deficiency. Some people also experience tingling in their hands or feet, which may indicate nerve issues linked to low levels of this vitamin.
Other possible signs include pale or slightly yellow skin, which can result from reduced red blood cell production. Some individuals report memory lapses, trouble focusing, or mood changes like feeling low or anxious. These symptoms may be connected to B12’s role in supporting brain health and regulating mood-related chemicals.
Shortness of breath, dizziness, and even a swollen or smooth tongue are additional signs to watch for. In more serious cases, vision problems or muscle weakness may develop. These symptoms typically build over time, especially if the deficiency goes unnoticed or untreated.
People most at risk include older adults, vegans, and those with certain digestive conditions or on specific medications. You can support healthy B12 levels by eating foods like fish, eggs, dairy, and fortified cereals—or by taking a supplement if recommended. If you notice these symptoms, consider checking your B12 levels with a healthcare professional.