It all depends on how it's prepared I would think. Is it sterile enough? Cut with the right solution for injection?
Mine is also liquid and came in a vial but I could not find clear information on if it was OK for injection so Im not risking it.

Something to watch for and a LOT of people had had problems with this. Yes you get good/great strength gains but since it sounds like you are not in Top condition now those strength gains may come with a price.

#1 Winny tends to dry out your joints/tendons
dry tendons lead to more prone to injury
#2 Strength gains are great BUT if you have not trained long enough and dont realize your limits MANY MANY people have injured themselves due to lifting to much to soon. Tearing tendons, ripping muscles or if you are lucky only a strain that will set you back 6 months or more.
Just because you can lift more does not mean you should.

Concentrate on FORM, not how much. Watch everyone else in the gym and you should be taking 2-3x as long to do a single rep compared to most people using NO body sway. Concentrate on the muscle you are using. Isolation.

Any compound can be used for bulking. It's about diet.