Question: what is the difference between zinc oxide and non nano zinc oxide?
Answer: “Non-nano” and “nano” refer to the size of the particles of zinc oxide. The range for "non-nano" is 100 nanometers (nm) or greater, while "nano" zinc oxide (used because it is non-whitening) is typically 10-20 nm in size. To give you a sense of how small that is, one nanometer is a billionth of a meter.