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Your point? Is Sodium chloride same as sodium and chlorine separately.

Extending your logic makes drinking liquid hydrogen perfectly safe because we drink water everyday.

That was their point: they were showing how ridiculous your first comment is, saying the same thing you are saying in your second comment. There is no elemental mercury in vaccines (this is probably the most debunked antivax argument).

Vaccines with Thimerosal is given to babies all over the world to this date. Formaldehyde is a known carcinogen (Cancer causing substance in human tissue) is one of the vaccine ingredients present in most vaccines.

Saying thimerosal is dangerous because of mercury is like saying salt is dangerous because of chlorine or water is dangerous because of liquid hydrogen. Moreover, it is mostly phased out of use.

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