No, it takes 3-4 weeks to build up and around 60 days to be fully stable in the blood.
Many use Letro before they start cycles because once the cycle starts it will take a while for it to build up enough to affect blood levels (3-4 weeks) and even longer to fully stabilize (60 days). Unless you have some studies that show that it starts effectively lowering estrogen in a week?
Most people who use letro go into cycles knowing they are sensitive to estrogen and gyno thus its need, otherwise I dont see why Adex wouldn't work for the average steroid user who wants to keep estrogen under control.





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