If I want to use for medical do I need the thc booster?
I would say yes. I also am growing medicinal and my babies are ding real well. look under forum on (grow). You will see week 7 flower 3. Booster is being used after the 4th week of grow. Do not want to do it too early, may be too much for young plant. Am not sure though, maybe other support can clarify this. Good luck:)
You can find details about using the marijuana booster system here: