Will I see a difference with 1/2 ml of Juvederm in my lips?

It depends on what your expectations are. Remember that these things cannot be done cheaply. You need the right amount of product to see results.

Thanks! I always start patients at 1 mL. The best plan always includes a full correction of the problem at hand. You are likely to be dissappointed with only a partial correction.Good luck. Dr. ALDO 

You will see a difference, but it will depend on the final results you want to achieve. I prefer to use a micro cannula to inject the lips to prevent bruising. Look for a cosmetic dermatologist or plastic surgeon who is an expert in fillers. 
I hope this helps.