I did 500mg of 250 on my first cycle, and I gained 17 pounds, after water went away I was left with about 12 pounds that stayed on,however my partner did the same thing and maybe gained 5 or 6 pounds.
I agree with DEI, I would go with the cyp.400 or more like 600 for your first cycle. Thats not enough to affect most peoples hairlines, but you aren't everyone either.
Do what you feel comfortable with.The main things are diet,rest,and workout, however the juice doesn't hurt.....lol
If your guy wants that much for Deca, hes probably high on other stuff too.
I'd say find another guy.
just my .02