My wife knows of my use, she gives me my shots everyday, and she is on gear also. I remember when I told her, I just explained what I do and how long I have been doing it and that I have been on the boards for along time and have read so much and research so much. She trusted me that I knew what I was doing and she was ok with it just as long as I didn't hurt myself. She seen the results I would get from doing gear and she eventually asked me what she could do to get the results she was wanting. I told her what I would recommend and let her read about the compounds and she tried it and liked it. She has done a few cycles with different compounds and loves the results she got. We run cycles together, not the same stuff of course but we do our cycles so we are both on at the same time at least for alittle while then her cycle ends but mine still goes on.
Basically you just have to gain their trust in it by showing them you know what you are doing.