The Transportation Security Administration is cracking down on the carriage of all powder at gateway airports.
Security officials said the agency will conduct more detailed screening of powdered substances in carry-on bags on international inbound flights.
The TSA says it is in line with security procedures for domestic flights which already employ stricter rules for powdered materials.
Starting June 30, passengers transporting 350 milliliters (12 ounces) of powder - about the equivalent of a soda can - will be required to go through additional screening and may be subject to a test for explosives.
It applies to all forms of powder including cosmetics, food mixes and baby powder.
Passengers are being advised to put all powder not required during a flight into checked baggage.
The added measures are to combat substances such as fentanyl, pepper spray and explosives.
Overseas departure airports serving the US with direct flights will employ the enhanced screening measures.
"TSA is communicating with our international partners to ensure last points of departure airports align with Pre-Clearance requirements and our domestic procedures as part of our efforts to raise the global aviation security baseline," TSA spokesperson Mike England said.
(Peak summer travel season and recent changes to TSA screening procedures are contributing to longer lines at check-in, baggage drop and security checkpoint areas at many airports. It is recommended you arrive at the airport at least 2 hours prior to your departure when traveling domestically and at least 3 hours prior to your departure when traveling internationally. We also encourage passengers to check-in online with their airline to help avoid delays.)