your body is always trying to achieve homeostasis. therefore yes, it would try and bring the test back up, but this doesn't always happen. everyone is different. i mean look at guys that need to go on testosterone replacement therapy (TRT), low test but they are still making some. and when you say people don't use an Aromatase inhibitor (AI) or hcg, and then just come in with nolva after a cycle, what makes their body start producing test? who says it does? if your estro is out of whack and you didn't use hcg, you're in for a long hard ride my friend. buckle up