Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia . 
Once more, an early study done on S-4 provided proof of full muscle regeneration in volunteers with degenerative disorders without the use of exercise and the minimum dosage of 3mg/kg/day. Changes can be seen anywhere from 1-2 weeks. This was the very first study classified S-4 as CLINICALLY SIGNIFICANT by improving skeletal muscle strength, lean body mass, and a reduction in body fat [Chen et al., 2005; Gao et al., 2005; Kearbey et al., 2007]. Unfortunately, there are always some side effects that arise when using Because S-4 is a ligand by definition, the side effects will never be permanent even at supraphysiological dosages and can be easily avoided through proper dosing.
Thank you for bringing this up, I am about to write a detailed review about the brand “Crazy Mass” and Yes i have used crazy mass products, a while ago i wanted to mix crazy mass’s D-Anaoxn Elite Series in my bulking cycle which usually has d-bal from crazy bulk. TBH D-anaoxn gave me this full feeling, I mean i couldn’t eat more then 2 meals and i was burping all the time like i had a something rotten made me feel a little sick, although despite of less eating i was able to increase my bench significantly put up some quick muscle too. But do i recommend it over crazy bulk d-bal? May be Naah,