Feeling exhausted after a full night’s sleep can be frustrating, especially when coffee, rest, and a lighter schedule do not seem to help. Sometimes the cause is ordinary stress or poor sleep quality. But in some people, ongoing fatigue, brain fog, tingling, or balance changes may point to something more specific: low vitamin B12.
Vitamin B12 is an essential nutrient involved in red blood cell production, DNA synthesis, and healthy nerve function. Because it is found mainly in animal-based foods, people who eat little or no meat, fish, eggs, or dairy may be at higher risk. Some adults also struggle to absorb B12 properly because of digestive issues or age-related changes.
Low B12 can be easy to miss because the symptoms often build slowly and can resemble the general tiredness many people associate with aging or a busy life. According to the source material, nearly 20% of adults over age 50 may have levels that are too low.
Common Signs That May Point to Low B12
1. Persistent brain fog. If you are forgetting words, losing your train of thought, or feeling mentally slow despite getting rest, B12 may be worth discussing with a healthcare provider. B12 helps support myelin, the protective covering around nerves that helps signals move efficiently through the nervous system.