Affects someone I know at the gym bad too... he's trying to figure out what will work better without the side effects. I'm watching from sidelines for now.
Any AAS can cause anxiety for a number of reasons. The worst will always be Boldenone due to it's effects on dopaminergic transmission. However tren and mast are up there too. I have heard guys getting anxiety from dbol which increases dopamine so you would think the opposite. Any changes in brain chemistry can effect anxiety in a number of ways. JJ I am on 50mg avar now and I noticed increased anxiety but nothing bad. But for one moment in work yesterday I did think not this again... luckily it faded away.
I'm a person who never suffers from anxiety, I actually barely knew what it felt like. Till I ran boldenone and all of a sudden I would get this weird worried feeling a.k.a. anxiety. For the first time in my life I felt it. It didn't get too bad but enough to make me uncomfortable. It seemed to ease up later in the cycle.