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What Is Blackstone Labs Letro-XT?Letro XT contains the two compounds of 3b-Hydroxy-Androsta-1,4,6-Triene-17-One and 3b-Hydroxy-Androsta-4,6-Diene-17-one. The 3b-Hydroxy-Androsta-1,4,6-Triene-17-One is a compound that is great for reducing estrogen and boosting natural testosterone levels and natural production of dihydrotestosterone. The 3b-Hydroxy-Androsta-4,6-Diene-17-one is a metabolite of ATD and helps limit the conversion of testosterone into estrogen, ensuring more testosterone i …