Robert F. Kennedy Jr. has been unflinching in his attacks on the Food and Drug Administration in recent weeks, saying he wants to fire agency experts who have taken action against treatments that have sometimes harmed people or that teeter on the fringe of accepted health care practice.

Some of Mr. Kennedy’s priorities are relatively standard, such as focusing on the health effects associated with ultraprocessed foods. Yet others threaten to undermine F.D.A. authority to rein in inappropriate medical treatments or to warn about products that can damage the public health.

A spokeswoman for Mr. Kennedy did not respond to interview requests.

Days before the election, in a post on X that has received 6.4 million views, Mr. Kennedy threatened to fire F.D.A. employees who have waged a “war on public health.” He listed some of the products that he claimed the F.D.A. had subjected to “aggressive suppression,” including ivermectin, raw milk and vitamins as well as therapies involving stem cells, and hyperbaric oxygen.

Some items that he singled out had become flash points for conservative voters during the coronavirus pandemic, including ivermectin, which was found to be an ineffective treatment against Covid.

Dr. Robert Califf, the current F.D.A. commissioner who spoke frequently about the dangers of misinformation in the Covid pandemic, said at an event Tuesday that he was aware that experts were not always right — but he worried about them being broadly ignored.