I played around with this. Over 30 years ago I did a sort of bridge with 15 mg/d. It held me some mass. Once I dropped it, it all fell off in a couple weeks as I am sure I was hypo at that point. This is a different application than TRT like replacement but probably similar. If I recall, I went completely off for 6 months after that and recovered as far as I could tell. Back then most gym rats cycled on and off. Bridging happened but not like today. I did the same thing with oxandrolone by SPA 7.5 mg/d at one point with similar results. I wouldn't say oxandrolone is a legitimate TRT since it's conversion to metabolites lacks some key analogues that are key such as estrogens. It worked fine for me as far as I can recall. Hell, back then guys use to put on 15 lbs on dianabol cycle regularly.