Metabolic support, and both formulas are stim-free. Incendiary Stage 2 carries 500 mg of MitoBurn L-BAIBA, a myokine signalling compound, in a single capsule. Stage 3 uses dihydroberberine for carbohydrate handling. Neither one is a stimulant, so both stack with any pre-workout on this site. Stage 2 is also here in 2 and 3 month supplies, because it is meant to be taken daily and consistently. Support for the work, not a shortcut around it.