i knew nothing about metabolites, but i have used this method. honestly it did seem to kick the flowering in faster. instead of 5-7 days it seemed to show on day 3-4 with vigor. i only left the lights off from the last day/hour of vegg and skip a day to get the new schedual for 12/12. whatever hours you would like it to be. i believe it, though i dont know why it works. maybe it scares the plants into flowering faster.lol