Here's an old article from Bryan Haycock on tribulus. It actually raises your LH levels a little bit, so it might not be completely worthless, but you would obviously want a SERM along with it. So, don't plan on using some herbal/sketchy supplement as your only means of PCT.
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As for controlling sides during the cycle, you can't go wrong with Invalid Link Removed. It has ingredients for liver, kidneys/bp, cholesterol, excess DHT/prostate, and many other benefits.