Green tea catechins inhibit COMT which can increase the half-life of the adrenaline hormones induced by caffeine consumption.
This opens a couple of possibilities:
-SIGNIFICANTLY greater effects with low doses of caffeine, resulting in lowered tolerance development to caffeine
-Modestly increases effects with high doses of caffeine.
In one study, supplementation with 90mg EGCG and 50mg caffeine 3x daily increased 24 hour energy consumption from +15 calories (50mg 3x/daily caffeine alone) to +79 calories (caffeine + EGCG)
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The reading you might have seen about ECGC and caffeine being useless is all confounded with caffeine tolerance. In individuals who consume over 300mg daily for long periods of time, the effects of caffeine begin to disappear. As ECGC merely enhances the duration of the effects of caffeine, it isn't going to be much help in the caffeine tolerant.
So, as you should already be doing, make sure you take stim breaks every couple of months.
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We've got a great price on both our caffeine and green tea products by the way