Green tea's catechins — EGCG chief among them — are associated in trials with a small rise in fat oxidation and daily energy expenditure. Small is the honest word for it, not dramatic.
Much of that effect is tied to the caffeine that naturally accompanies the catechins, which is worth knowing if you're sensitive to caffeine or already drink coffee.
It's listed first on the LipoPeak label and is the ingredient with the deepest research base of the six, though the per-serving amount isn't published.
Where it sits in the formula: one of six named ingredients on the LipoPeak label, alongside Cayenne Pepper Fruit Extract, Gymnema Sylvestre, Raspberry Ketones.