Para-aminobenzoic acid (PABA) is a naturally occurring substance that is often used in sunscreen products. PABA is sometimes called vitamin Bx, but it is not a true vitamin.

This article discusses reactions due to PABA overdose and allergic response. PABA overdose occurs when someone accidentally or intentionally takes more than the normal or recommended amount of this substance.

This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.

PABA; Vitamin Bx

Para-aminobenzoic acid (also known as 4-aminobenzoic acid)

PABA is used in certain sunscreen and skin care products.

It may also naturally occur in the following products:

• Brewer's yeast
• Liver
• Molasses
• Mushrooms
• Spinach
• Whole grains

This list may not include all products that contain PABA.

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Para Symptoms

Review Date: 01/14/2010
Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)