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This kind of epilepsy is called pyridoxine-dependent epilepsy, because it’s treated by giving the patient heavy amounts of vitamin B6, or pyridoxine.

Food companies may soon print “vitamin B6” on their labels instead of “pyridoxine,” for instance.

For more than 40 years, pregnant women around the world sought help for morning sickness through a combination of the two main ingredients in Diclegis: pyridoxine and doxylamine.

Several lawsuits merged into a single case in 2011 accused Kellogg of deceiving consumers by labeling products as "All Natural" when they contained ingredients such as pyridoxine hydrochloride, calcium pantothenate or hexane-processed soy oil.

Such ingredients occur naturally — wheat germ and flaxseed are sources of pyridoxine hydrochloride, for example — but food companies, as well as makers of vitamins, often use synthetic versions to control costs and ensure consistent supplies.