My take on it:
IMPI 1 - Pheromone +
secret african herbal aphrodesiac (not around anymore)
IMPI 2 - (Currently up), same pheromones, more of the
secret ingredient (or tweaked secret ingredient)
IMPI Beta - same pheromones as IMPI 2 (not sure about the
secret ingredient) + different cover scents.
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