After tens of millions of doses of Hydroxycut were taken by consumers, one person died. This, along with reports of a few dozen liver-related side effects, caused the FDA to push for an industry-wide recall of virtually all Hydroxycut products. The thinking behind the warning? The risk of side effects is very low, but the FDA doesn't believe consumers should be exposed to such risks.
Not from a dietary supplement, anyway. When it's from a vaccine or a pharmaceutical, such risks are deemed "acceptable" by the FDA. Remember the outcry over the COX-2 inhibitor drug Vioxx and the testimony by Dr. David Graham of the FDA who calculated the drug killed over 60,000 Americans? That drug was voted "safe" by an FDA panel even after its own manufacturer voluntarily recalled it from the market!
When it comes to pharmaceuticals, you see, killing 60,000 Americans is no big deal. But when a dietary supplement is linked to a single death, that's more than enough for the FDA to spring into action with its spin machine to destroy the credibility of the dietary supplement in question.
The same thing happened with ephedra (ma huang), a perfectly safe Traditional Chinese Medicine that's been safely used for over 5,000 years in China. It's an important ingredient in all sorts of Chinese Medicine formulas, including anti-viral formulas that cave save lives during a pandemic. But thanks to the FDA, ephedra is now illegal to sell or prescribe in the United States, and anyone prescribing it to patients can be arrested and threatened with being shut down and put out of business.