What steveB said below is correct. Cutting oil should be done with oil. B12 it's self can be painful. When combined with oil you risk pressure/flow variations as the fluid is injected. This can be very painful. IMHO b12 is a waste for unless you have a deficiency for one reason or another. You're unlikely to notice anything other than placebo effect if your body already has healthy levels of the vitamin.

I searched a lot about AllDayChemist Reviews. I found, that AllDayChemist is one of the most popular Online pharmacy store. Having an experience of decennium. The categorisation of the shop is quite broad, having a standard delivery time. But the one thing which is really unfortunate is that they did not accept major credit cards but yes! they accept eCheck, wire transfers and “money order as well. According to reviews, they have a standard delivery time. Some unique features are really brilliant which makes this store different from others. Lets, have a look...While paying through check and money order you get $15 discount on purchase of more than $100. They charged flat shipping rate of $25 with 100%delivery guarantee. The maximum time for shipping is 5-15 days. If any delay will occur in your order, then you can ask for refund or reshipment. Overall, the service is just amazing. The only one thing which they should improve is on the customer-care department.
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I used to buy Vitamin B complex in Mexico and inject it. I would buy a bunch and bring it back home. It gave me energy and I would want to eat right away. But as far as I know if your steroid is oil based then you should cut it with something oil based. If you know where I can get B12 online let me know because I'm tired of driving 3 hour to get it in person.