I have been using a product called "Blossom Set" It does work and it works good. The active chemicals are called Cytokinin and Kinetin they are said to be organic. I don't know who said it. Liquid Karma also has Cyrokinin in it. Blossom set works better for me because I spray it right on the bud. You can also spray Liquid Karma, the color of it might stain the buds.
Happy Trails & Peace to all