Supplement safety? My understanding is that the FDA doesn't regulate supplements,

[Warpy]

2. Spot checks have found a significant level of fraud

in herb capsules. They don't contain the plant(s) they list on the label, they don't contain the plants in the concentrations listed on the label, and since the plants are different from season to season, the numbers they give are meaningless.

Oh, I think these companies try to keep it honest, it's easier and often cheaper than just putting dry parsley in everything. The spot checks have just seemed to find a lot of mislabeling out there.

The FDA exists to make sure they're not poisoning anyone or selling the opium pods, marijuana and coca leaves that actually do some good (boo, hiss). They've stepped in on a few things that do have unwanted side effects, like comfrey, licorice root, and lobelia, requiring warning labels on some and banning the sale of the dangerous ones, like lobelia.

Whether or not herbal nostrums work is another matter, entirely, which is why the FDA has classified them as foods.