[grey_whiskers]

That being said the use of nanoparticles is tightly regulated by the FDA, requiring extensive testing for safety.

Use whatsoever?

Use in the lab?

Use in animal models?

Use in human testing?

Use in prescriptions?

"Off-label" usage?

Your remark is somewhat...vague and generalized.

[packagingguy]

Used in the body as a drug or device. The FDA does not regulate research laboratory use, that would fall under OSHA, DOT (for transport), or the EPA.

I was speaking of the use if nanoparticles in FDA cleared products. Guidance documents are on their website if you want to bore yourself, it’s a long read.