In the past most of them were made from toxic or carcinogenic ingredients.Growers who want to control a type of growth such as height, to initiate flowering or take clones use PGRs or plant growth regulators.All of those are now banned from use on cannabis for obvious reasons. They're harmful.This is different, we use natural extracts like salicylic acid (willow bark) or Triacantanol (Push) which are safe and are not sprayed on plants but fed through the roots. Also our PGR products are CFIA registered for use on cannabis.