Well if it's Ref-B don't inject it your just looking for trouble + it hurts for a few day after (and I have a tolerance for pain). But, Denkal makes a liquid D-bol that kicks major ass although it's low dosage you will see awesome gains with no pain.
Actually you must be getting Denkall D-bol because of the fact that it's 10ml bottle and 25mg per ml. I would inject it. I've seen better gains that way. The only thing is you need 3cc every other day. It's an oil base so it absorbs into your system slower than the oral equivalent would. If you want to take it orally buy the capsules they also kick ass, but the liquid is made for injecting. Good luck