Thousands of students depended on the government scheme for health care.
The secret society has hit the headlines over the years, with members like the influential Ambrose Rachier.
The prices will be effective for the next month.
The orders will affect all procurement activities done by the government starting next month.
Mbadi clarified the matter after uproar from education stakeholders.
Nairobi County ordered the retailer to close all its branches after a spot check revealed the expired products.
The order comes after Kenya witnessed several instances of internet shutdown.
The Senator was thrown out in the presence of Health Cabinet Secretary Aden Duale.
Calls for stricter inspection and enforcement have been growing after numerous deaths from building collapses.
The highway is part of an initial Ksh190 billion deal to ease traffic along one of the country's busiest transport corridors.