Advanced Nutrients Voodoo Juice consists of five different microbes that innoculate the root system and are absolutely essential for explosive yields. One of which, a nitrogen fixing microbe, will assure an adequate uptake of nitrogen throughout your plant's life. The other four break down complex fertilizer molecules to make them readily available to the plant. When looked at under a microscope, these microbes literally melt micronutrient molecules so the plant can uptake them without exerting any extra effort. Root mass has been found to increase as much as 90% when fed Voodoo Juice. Hydroponics r us Recommend to use Voodoo juice all the way through veg.