Thankfully, I don't use supps, but it's good that someone is keeping us informed of the problems.
To prove even the healthiest of stuff can be detrimental, hubby found out that green tea interferes with immuno-suppressants that kidney patients take; so, he's ditching all the green tea that we have...fortunately other people pass information on otherwise he'd be no wiser and damaging his kidney health. So, rep+ for informing people of the Hydroxycut problem.
PS: if there's no rep+, it's 'cos the system wouldn't allow me to rep you