Ray Peat on vitamin B1

Vitamin B1's Rapid Impact on Irritability and Mental Clarity

"A peculiar kind of irritability, sometimes with a sense of having your head in a kind of cloud, is often a result of a vitamin B1 deficiency. If that is the cause, it will clear up within a few minutes after taking the vitamin. Magnesium deficiency is another common cause of irritability."

- Nutrition For Women