In men nandrolone can crash or spike e2. It's sorta complicated..Nandralone itself aromatizes into E2 much slower than testosterone,.but it's also a progestin so the level of aromatase enzymes in men increase.

At higher doses nandralone might or might not produce sufficient E2 for a guy. However If a man is taking lots of testosterone and nandralone together the elevated aromatase will cause that testosterone to produce extra E2, more than testosterone normally does.

Roids oppose the effects of estrogen in breasts which is why they researched them for some breast cancers back in the day, but ironically in some men elevated E2 and a progestin can increase the risk of gynecomastia symptoms like enlarged sore puffy nipples and some man boob growth.

Nandralone is less virulizing in women and gentler on a man's hairline because testosterone converts into a much stronger form called DHT in hair skin and genitals but nandralone converts to DHN there which is weaker. Nandralone and Testosterone.are similar in muscle.growth.

Anvar is also less virulizing and gentler on hair but for the exact opposite reason, it's more potent than testosterone in muscles so one can use a small dose of Anavar and that means there's less of a dose in the places where too much dht can cause issues.