Short answer: "thermogenic" describes ingredients studied for modestly raising caloric expenditure — and "stimulant-light" means a formula avoids a heavy stimulant stack, not that it contains zero caffeine.
What makes a supplement "thermogenic"
Green tea extract's EGCG is the most researched natural thermogenic compound, studied for a modest increase in fat oxidation and daily caloric expenditure. This is a real, if incremental, effect — not a dramatic "fat furnace" mechanism.
Why "stimulant-light" isn't "stimulant-free"
Green tea extract naturally contains caffeine alongside its EGCG content. A formula built around it can honestly avoid an "undisclosed stimulant stack" while still containing a mild, natural caffeine source — worth factoring in if you're caffeine-sensitive.
Who tends to tolerate stimulant-light formulas better
People who react badly to heavy caffeine-stacked fat burners (jitters, anxiety, rapid heart rate) often tolerate a milder, single natural-source formula more comfortably — though individual sensitivity still varies.
One natural thermogenic ingredient, fully disclosed
No undisclosed stimulant stack, no ephedra.
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