What vitamin can I take when I feel emotionally unstable?

Vitamin B1 deficiency can lead to emotional instability and delirium, particularly affecting brain regions like the hippocampus, amygdala, and mammillary bodies. It's crucial to maintain adequate intake of B1, as it's water-soluble and not stored in large amounts by the body. Higher carbohydrate or sugar consumption increases the body's need for vitamin B1. Consulting with a doctor before altering your diet or starting supplements is advisable, especially for those with existing health conditions.