Vitamin B12 is water-soluble, so excess amounts are usually excreted, reducing the risk of toxicity. However, high doses might cause side effects like dizziness or headache in some individuals. The recommended daily intake is 2.4 micrograms for adults. Have you been advised to monitor your B12 intake? What led you to explore this topic? It's always great to chat about how you're feeling or if there are specific health goals you're working towards.