It's all a matter of preference... Are the gains at any given dosage worth the risk of sides at that particular dosage. I'd recommend starting low, with heavy's recommendation, and if you like the results it's producing after 3 wks, keep it at that dosage, however if you want to push for a little more gains and tip the scale of risk v. Reward, bump it up to 6 caps for a remaining 3 wks and evaluate the entire cycle when it's done as to which experience you enjoyed more... This is one reason keeping cycle logs can be very beneficial.
Let me know if you have any questions, we're here to help