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You can search the advantages and disadvantages of two hepatitis B vaccines online.

It is said that Yi Kexin has no preservatives.

Yi Kexin? It is completely free of thiomersal and preservatives.

Slogan: Anti-hepatitis B, more protection, more confidence.

Each dose contains 20ug/ml of recombinant hepatitis B virus surface antigen.

Who approves hepatitis b vaccine to prevent primary liver cancer.

The most widely used hepatitis B vaccine in the world.

Contains trace amounts of thiomersal.

Search on the internet yourself.