The National Network for Immunization Information (NNii) provides up-to-date, science-based information to healthcare professionals, the media, and the public: everyone who needs to know the facts about vaccines and immunization.

Vaccine Safety

Hepatitis B Vaccine and Multiple Sclerosis

Although scientific data show that HBV vaccine is very safe, anecdotes have caused some to hypothesize that HBV vaccine might be associated with an increased risk of demyelinating neurological disorders, such as multiple sclerosis.

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Vaccine Components

Aluminum Adjuvants in Vaccines

Some vaccines contain chemicals called adjuvants to help stimulate the production of immunity against the vaccine ingredients, making the vaccine more effective. In the United States, aluminum salts have frequently been incorporated as adjuvants in vaccines.

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