You can no longer purchase products from other countries that contain ingredients not regulated by the FDA. This means that you can no longer purchase toothpaste that contains novamin or sunscreens that lack all the junk that you find in American sunscreens Some of these products have been used used for decades in other countries and have been tied up for years pending FDA approval CSMS # 65581188 - Section 321 (De Minimis) Shipments of Products Regulated by the U.S. Food and Drug Administration (FDA)
Although tariffs have received all of the coverage the directive prohibiting the importation of those products is most likely another form of protectionism. Donnie is definitely not a supporter of free markets.
The difference is that those products have been imported into the US for decades with no adverse side effects. Also let's not forget that thanks to the best Congress that money can buy purveyors of questionable supplements can promote and sell their products with very little oversight from the FDA and without the need for any clinical trials provided that their ads contain the disclaimer usually in a barely readable font that the product has not been approved by the FDA and that the claims in the ad have not be verified.
As Milton Friedman said in 1973, for every thalidomide-type mistake the FDA prevents it also prevents 10 pennicillin-type successes. Overall the FDA has probably killed hundreds of thousands of Americans net. Trying to explain this to a Democrat is like talking to a brick wall
And yet it's now an appointee of the Republican party who is actively discouraging albeit not outright banning the use of vaccines that have been proven to be safe and effective in some cases over a period of decades.