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nandrolone is filling in at the androgen receptor for test, and the ratio of androgen receptor activity vs the activity at the estrogen receptor is something to pay attention to.

if its not expensive, normal testosterone test may be something you get out of curiosity and can track over time while you are on nandrolone. it may be useful for some to adjust dosage if you are to ever experiment with dosage. the number you get on that test is indicative of the level of hormone that has affinity for the androgen receptor.

 if a physiological amount of substance (nandrolone here) activating the androgen receptor is suspected to be anywhere ideal, making sure E2 is dialed in and high enough while on nandrolone can be a primary focus. it is worth doing even without getting testosterone tested. Likely you will have little DHT as nandrolone reduces to dihydronandrolone. Your estrogen may be close to what it needs to be on 500iu 2x of hcg but maybe still low. nandrolone also is not likely to elevate prolactin buy still may be worth testing.

nandrolone is 3 times more potent at androgen receptor stimulation so a relatively modest dose would maintain physique and expression of the androgen receptors and subsequent physiological functions.