Verified answer

It depends on the chemical properties of the powder, what you intend to use the powder for, and how you would pulverize it. Pulverization can alter the powder if there is high heat involved (such as by high rotation of blades) and the powder is sensitive to heat.

Some of the metal bits of the blade can enter the powder but in minuscule amount. That said, however, can still be an important factor if you are dealing with micronutrients, for example.

To "pulverize" means to grind to a powder. Sugar can be "pulverized" by grinding it in a food processor or in the spinning-blade type of coffee grinder....!!