There is some evidence that pantothenic acid has some effect on allergies, but it requires that you take it with a number of other vitamins for maximum benefit.
Pantothenic acid can be highly effective in treating allergy symptoms. Patients with allergic rhinitis who took 250 mg/ twice daily experienced almost instant relief of their allergy symptoms.
Pantothenic acid is typically not used for allergies. There is some evidence that it may be helpful, but this evidence is limited and at times vague. It would be advisable to start with a lower dose to assist with nasal congestion, but too high a dose could cause nasal dryness.
Pantothenic acid, which is also called Vitamin B-5, has been shown to be effective in reducing nasal congestion brought upon by allergies. However, it needs to be taken with a combination of Cholin and Thiamin, which are also B vitamins. This is can also be a remedy for heartburn.