I have a vague recollection of selling some sort of licorice product at my nutrition store back 16 17 years ago. Might be more effective... Or use them both.
As far as drug testing, might be possible to use methyl-test for a couple weeks.. Maybe even a week prior, if you have some sort of an idea when the testing may occur. Even just test alone in a small dose should just shut down and replace natural production.
For instance 200mg cyp on monday(day1)should shoot test levels to 1200-1400ng/dl by wed(day3) and by day 10 should be down to 700-750. A month of doing that (just 2 injections), then waiting 3.5weeks after your 2nd shot to get blood work may have your test levels come back in the 200-300range...and if you get drug tested during that time by the time the results come back you could say you tried an OTC "test booster"& if they re-test, even if they test you on day 3 when its 1200-1400, if they re-test on day 5 or 6 you should be back down to 900, which is the upper limit of "normal" test levels. Unless they do the expensive "carbon isotope" blah blah testing which differentiate between natural testosterone and testosterone derived from Mexican wild yams (like the test in your bottle of Phizer cypionate)...... Could also do the same thing with oral test (methyl test). The body produces 8-12mg testosterone per day, so you could just use 15-20mg/day(bioavailability isn't 100%) for 3 wks (half life is 8-12hrs so it doesn't build up) should be long enough to shut down and replace natural test production. With drug testing, same thing. If you take a tab of methyl test in the morning and get tested in the afternoon & you expect it to come back higher you would just not take it for the next couple days until the test results come in and if it's high and then retest you all the time of the retest the levels will be back to normal or below normal.