The Lipo-6 product looks like it would be a very potent stimulant.
Tyrosine and L-Dopa are both precursors to dopamine,
Synephrine is similar to ephedrine (and will make you test positive for amphetamines),
Dendrobium Nobile is similar to DMAA (another banned stimulant),
Yohimbine is a long-lasting stimulant (feels a bit caffeine-ish, but more "clenchy"), typically prescribed for sexual dysfunction,
And then you've got a boatload (actual amount never disclosed) of caffeine.
Sounds like a heart-attack in a bottle for those that aren't pretty stimulant tolerant.