Deca is not the same as test for me.
In my experience:
I've only use NPP but nandrolone is nandrolone
(1) Rounder, fuller looking muscles
(2) No muscle soreness even after intense workouts. I only took rest days for nervous system to recover
(3) Faster heart rate
(4) Night sweats if I don't take prami, caber
(5) studies have shown it causes heart enlargement, cardiac remodelling, and 11x more damage to blood vessels than test (which is why i stopped using it)
(6) Some effect on lipids but not as much as tren
(7) Much better mass builder for me than test
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Potential deca dick (never got it, but big big thing depending on your relationship status/type of job)
Test:
(1) Thickness like nothing else. 500 mg of test gives me more thickness than 2g of npp (yes I tried this npp dose for a while just to see what it was like). It's really an unmistakeable thickness that makes you look powerful. I can't really describe it. I think Jizmo has the same experience
(2) Shit load more strength than equivalent amount of deca or more
(3) No joint lubrication properties
(4) Worse skin quality. DOn't know why test just makes me look a little older/rugged. Also more acne
(5) No muscle shape influencing qualities. With test you basically become a bigger version of yourself. Whereas with something like NPP I can see delts growing more in proportion to growth of other body parts. 19-nors really seem to blow up my delts, don't know why
(6) more aggressive mental state and drive
(7) Increased DHT increases raises my BP a lot. NPP doesn't really raise my BP that much
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test is a good mass retainer for me but not so much a mass builder. I found that I have to use higher anabolics to build, then use test to maintain
these observations are for each compound individually. I think the best for mass and some nice shape would be test and deca together