Deca would be the worst steroid of all to run alone. You'd have no dick or sex drive at all. All steroids require test as a base. What is your stats, experience, and goals?
Not sure how u can claim u saw his videos of you are asking this question, he literally ALWAYS says to run a test base. Rewatch the vids and take notes
It's already been stated but no never. You should never run deca alone. Ever! Always run it with test and run your test higher than deca or the sides will be a pain. Deca dick isn't a myth and gyno could get out of hand if your dosing deca too high and not taking the proper on cycle support
well your goal sounds more like you want to not be any kind of a ladies man whatsoever the rest of your life... run deca at 20 years old or any other steroid and see what happens... you run deca alone at 20 years old and you might as well get a permanent place at moms house crying because you are going to wreck your life, period...