End of the vial issue.

I already tried exactly that, moving the plunger up and down a few times with the vial inverted, but still could not get the last drops. I thought about just popping the top off and drawing straight from the opening but ran out of time in the morning rush.

Thinking about it now, maybe that leftover is why most COAs I see show the vials slightly overfilled.

Even so, missing those few drops means the final dose ends up smaller than all the earlier ones from the same vial.

If you really want to avoid taking a bit from the next vial, just add another 0.2 ml of BAC and you should be able to pull out about 95 percent of what is left.

That method gets almost all of it. The actual active powder is such a tiny amount that the filler makes up most of the weight, so slight overfills are common when labs try to hit the target. It is easier to leave it a little over than to keep adjusting.

It is not about the cost, it is about getting the dose right. I already had another vial mixed the day before, so pulling from that would just leave me short again. If I had known I would lose some I would have added extra liquid like you said. Next time I might just open the vial if the same thing happens.

When I have only a partial dose left I just inject what I have and finish the rest from a fresh vial. I like being precise but I cannot control or measure the fill variation anyway, so a 0.02 ml difference does not bother me. If I only got 0.08 ml from the old vial I would toss it and pull the full amount from the new one. Some people remove the cap to get every drop but I have plenty on hand so it is not worth the trouble.

I will try that next time. It makes sense because I use short needles and the opening might sit just above the last drops. It was early and I did not think to try every angle.

This is the way.

You could just mix the next vial before you reach the final dose and skip the early morning hassle altogether.

Like I mentioned earlier, I already had a new vial mixed the day before because I only had 0.1 ml left and needed 0.2 ml total. I thought I was set, but something always comes up in the morning.

Same here. I keep one mixed a few days ahead when I am getting close to the end so I know I will have enough.

Both wrong.

At least explain why.

Why change the original amount of BAC? Most people do not use 3 ml or 5 ml syringes for this. My 0.5 and 1 ml syringes hardly hold any extra liquid after I check. I purge with BAC after filtering.

Would you use one syringe for both vials or do two separate injections?

For R20 I now use 0.6 ml of BAC and transfer it to a pen so each dose is 0.3 ml. I prefer not to inject too much BA. It dissolves fine up to 80 mg per ml.

I would use one syringe and have done so, though some will probably call it sloppy.

Sanitation-wise it seems fine to do the new vial first then the old one, but getting the exact amount is tricky. Going from old to new feels off.

No measurement issue for me. It does dull the needle a little, though not much with an insulin needle. That is why I switch to a separate draw needle for thicker oil products.

That is why two separate injections are better. Pull what you can from the old vial, note the units, inject, then use a fresh syringe for the rest from the new vial. I would never stick a needle that has been in one vial into a new one. Syringes are cheap and I already take enough risk with grey-market stuff, so I limit exposure wherever I can.