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Almost all steroids suppress Cortisol. Everyone gets caught up in the other side of the argument (IE anabolism) but Cort. suppression is a close second. Gear in general helps your body recover from HIT. Without any gear and assuming you are not too old, you can train like an animal (see Dorian Yates routine) for one day but you must take the next day off. If you went into beast mode 2-3 days in a row your cortisol would elevate and you would start getting smaller and weaker. Gear enables you to bust your ass everyday and still recover...w/ in limits. You can train like a madman 5-6 days a week on cycle, whereas 4 days tops if you are natural.