I'd like to start my saying this is just a broad example and this will vary from person to person, but from all the accounts I've seen with trt patients, 100mg test cyp a week puts most around 500ng/dL Total Test, which is probably around where a lot of people over 35 stand naturally. We'll call 500ng/dL an average natural T level for men 35-50. So let's say 100mg a week will give you average test levels. Divide 100mg by 7 and that's how many mg worth of test the average person produces a day. About 14mg.
***this is a ROUGH average based on several accounts I've seen and can vary greatly from person to person. This was just for general reference.