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Unfortunately, the answer isn't very comforting, especially for new U.S. residents for whom the HPV injection containing sodium borate is now mandated.
Sodium borate, a boric acid salt also known as borax, has many common uses. In addition to its use as a rat poison, it is also used in laundry detergents, cosmetics, enamel glazes, flame retardants, and buffer solutions in chemistry. However, sodium borate also has antifungal properties, which means that its probable reason for being in the vaccine is to act as a preservative.
Sodium borate is used as a food additive in some countries, but it is now outlawed in many places. For example, one Australian government recall site notes: "Product is Borax (sodium borate) which is a non permitted food additive and is harmful to health." So, if it's "harmful to health," why is it being added to the HPV vaccine? (Source: Natural News.com)