From the Research
Excessive vitamin B12 intake is unlikely to cause drowsiness, and if you're experiencing drowsiness, it's essential to consult with a healthcare provider to rule out other potential causes. The relationship between vitamin B12 and drowsiness is not well-established, and most studies focus on the consequences of deficiency rather than excess 1, 2, 3. Some studies suggest that high serum levels of vitamin B12 can be associated with various conditions, including solid neoplasia, hematological diseases, and liver disorders, but drowsiness is not a commonly reported symptom 4. It's crucial to note that vitamin B12 plays a vital role in cellular metabolism, and its deficiency can cause a range of symptoms, including fatigue and weakness, but excessive intake is not typically associated with drowsiness 5. Key points to consider include:
- Most adults need only 2.4 micrograms of B12 daily, and taking significantly more than this amount may lead to side effects, although drowsiness is not a well-documented consequence.
- If you're experiencing drowsiness, it's essential to consult with a healthcare provider to rule out other potential causes, as fatigue and drowsiness can be symptoms of many different conditions.
- The timing of B12 supplementation may affect energy levels, and some people report that taking B12 earlier in the day rather than in the evening helps to minimize potential side effects.
- If you're getting B12 through injections, discuss adjusting the frequency with your healthcare provider to ensure you're receiving the appropriate amount for your needs.