Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Share This:


Web Support

Stack of legal papers next to laptop

Copyrights & Disclaimers

See NTP's policy on copyrights and external links. Go
Computer keyboard with red help key


Get help on issues with the website. Go
Woman using tablet computer

Site Map

See how this website is organized. Go
Directions sign on NIEHS main campus

Visiting NTP

Find addresses and driving directions to NTP's campus and other buildings. Go