No study has led to the isolation of true human sex pheromones, although various researchers have investigated the possibility of their existence.
[1][2] Pheromones, in general, are secreted chemical substances by organisms that trigger a social reaction in the same species.
[3] Experiments have focused on three classes of putative human sex pheromones: axillary steroids, vaginal aliphatic acids and stimulators of the vomeronasal organ.
[4] Several axillary steroids have been described as possible human pheromones: androstadienol, androstadienone, androstenone, androstenol, and androsterone.
Depending on the time in the month the sweat was collected (before, during, or after ovulation), there was an association with the recipient woman's menstrual cycle to speed up or slow down.