Osta can slow the recovery of the HPTA as it is slightly suppressive (approx 1-2ng/dL/ed on avg) when used at it's recommended dose of 3 caps nightly.You could take it now at 2 caps daily, or wait till after PCT and take it at 3 caps daily for up to 12wks - 8 wks of Ultra Male stacked to the end of it will work as a Mild AI and help prevent too much shutdown.. if it bothers you, you could run a small PCT of E-Control following the Osta cycle.