NaPO4·12H2O an Emulsifier, Buffering agent, Sequestrant, Metal-chelating agent

Although it is the active ingredient in at least one toilet bowl cleaning tablet, TSP is generally not good for cleaning bathrooms, because it can corrode metal… Similar chemicals were once common in laundry and dishwashing detergents, but the phosphate, being a fertilizer, would cause algal blooms in the bodies of water that the drains led to.

Wikipedia.com – http://en.wikipedia.org/wiki/Sodium_phosphate

Present in these vaccines:
ProQuad – measles, mumps, rubella and varicella

a.k.a.
Trisodium phosphate, dodecahydrate, Sodium phosphate tribasic, E number E339