Supplements derived from natural sources are not regulated the same way as are artificial, patented drugs.
They are regulated by:
The Dietary Supplement, Health, and Education Act of 1994.
The media often lie by saying they are not regulated.
Doesn’t look so good on the Wiki.
That is disingenuous. They are BARELY regulated is the best way to say it - FDA isn’t even required to give approval, and can’t do anything unless adverse effects are reported.
It is NOTHING like the FDA and how they treat real medical items.