Certain nausea medicines, such as pyridoxine (vitamin B6) and Unisom (doxylamine), are safe to take during pregnancy to help ease morning sickness symptoms.

Despite being readily available in the diet, vitamin B6 is also widely included in various supplements, multivitamins and other products.

In recent weeks, reports have been circulating about severe reactions in people who've taken over-the-counter vitamin B6 ...