Oh it helps, definite, dianabol is one of the drugs potentiated by grapefruit juice and I have done it. Only hard part is figuring out dosages but by my best guess I can say that if you want the effect of 30mg dbol, you can get this by taking 20 and adding about eight ounces grapefruit juice or do as I do and eat one grapefruit with am dose, I usually take mine all at once in am but other's spread it out. There are a number of drugs whose breakdown is inhibited by grapefruit juice, benzos for one but there a plenty of others. Some drugs in pharmacies come with a little sticker that warns against taking meds with grapefruit juice.