Amount needed depends upon amount of muscle use. People who use the same muscles over and over need more. Nurses, waiters, mail carriers, and pianists are examples of people who would need larger amounts. Symptoms of toxicity are not seen. Storage does not take place.
Excretion is through the kidneys.
An old wives tale says that if you wake up in the morning and don't remember that you were dreaming you are deficient in pantothenic acid.