My first dose was taken with an 18g. 2nd dose i used a 30g 1/2" but I had oil run down the sides of the syringe. Im not sure if the 18g jua t left a large hole that didnt seal or if the air i pushed in pressurized the vial too much and pushed it out around the 30g. Hoping to figure this out before my next shot. I know I lost some on this shot and lost some on the first and I think i overdrew it a little bit but when the bottles are put side by side full and half empty it actually looks like I still have slightly more than half. Do they fill 1ml vial to exactly 1.00ml or do they put extra in to account for needle loss and stuff.?
I was prescribed these 1ml vials for the first few years of trt. There won’t be any extra in the vial. Also no need to inject air into these 1ml vials. 18 gauge needles can tend to “core” some rubber stoppers but I doubt it will happen too severely with 1 or 2 draws. Try using a smaller gauge needle. I use 22s to draw and 27s to inject.
I’m using a 30g insulin needle. Everything I have seen said that it won’t fill without pushing air into the bottle. Will give it a try without air next time just dont want to keep pushing the same needle through the rubber more than I have to losing oil if I end up having to push air
I’m guessing you’re using Testosterone Cypionate or Enanthate from of a rubber topped vial and not a glass snap-top ampoule.
You probably already know most of this information but I’m going to go over it again in case you are missing a step. I will also add tips to keep the oil from leaking out of the syringe or vial. The most common method I know for drawing Testosterone out of a rubber top vial and injecting are as follows:
Method
A syringe with an interchangeable needle tip is used (Syringes without fixed needle tips use a “push-on/pull off” or “twist-on/twist-off” needle tip system so that different gauge needle tips can be attached to the same syringe. “Push-on needle tips” can not go onto the end of a “twist-on syringe”, and “twist-on needle tips” are not made to go on the end a “push-on syringe”). The drawing needle that pierces the vials rubber to pull out the Testosterone becomes blunted after going through the rubber, so another needle tip is attached to the syringe after drawing the Testosterone. The fresh needle that is attached to the syringe, after it has the Testosterone in it for injecting, is sharper and pierces the skin and muscle smoother and cleaner.
A 18-25 gauge drawing needle is attached to the syringe.
The vial is turned upside down.
The needle is then inserted through the rubber seal of the vial while the vial is in the upside down position.
The plunger is pulled down to draw the Testosterone oil into the syringe to the line marking the measurement of prescribed amount.
The vial is then turned right side up.
The syringe with the attached needle is then slowly pulled out of the rubber seal from the vial which should be in the right side up position (this helps prevent oil from leaking outside of the vial during the needles extraction from the vial).
The plunger is drawn back to clear the oil from the drawing needle tip you attached on the syringe (air can enter the syringe)
The drawing needle tip is then carefully capped and removed off of the syringe.
A 25-30 gauge injecting needle is then firmly pushed or twisted onto the syringe.
The plunger is pushed in a little to remove the excess air and push the Testosterone up through the syringe and into the fresh needle tip. The plunger should be pushed until a very small amount of Testosterone comes out of the end of the needle to drip down the needle and lubricate it for puncturing the skin and muscle.
You are now ready for injection.
Tips On Injecting
Pushing air into the Testosterone vial with the syringe is used to create “Positive Pressure” inside the vial and avoid the vacuum created when drawing out the Testosterone from the vial. “Positive Pressure” is not necessary when drawing with an 18gauge syringe. Using syringes with changeable tips allows you to draw with an 18gauge and inject with a 30gauge if you choose (I draw with 18gauge and inject with a 25gauge. The other advantage is that using a different needle tip to draw and a different needle tip to inject is that the needle is not blunted when piercing the skin.
“Positive Pressure” (injecting air into the vial before drawing Testosterone) probably only needs to be used if you are drawing Testosterone from the vial with a high gauge (thinner) needle.
If you would rather use a high 30gauge needle to draw the Testosterone from the vial or only have a 30 gauge fixed syringe (needle can’t be removed from the syringe), then apply “Positive Pressure” inside the vial. Importantly
If you use a 30gauge needle, make sure the syringe barrel (what the plunger recesses into) IS thin like a 0.5ml syringe and NOT thick like a 3.0ml syringe.
Thinner syringes create more pressure and are more capable of drawing up the viscous oil Testosterone Cypionate and Enanthate are typically suspended in
I’ve also been told that keeping your vial warm prior to injection makes the oil draw easier.
Sorry if I’m telling you many things you already know. Good luck. I hope this helps 
Lastly, if you feel much more comfortable using a thin 30gauge needle on your syringe, make sure the vial is upside down when drawing your Testosterone and tilt it right side up when removing the needle slowly from the vial
I’ve used Positive Pressure (injecting air into the vial) in a 10ml bottle and removed the needle quickly while the vial was still upside down, and had the Testosterone push outside the vial through the rubber top and down the needle.
It was leaking out while I was filling the syringe upside down I think it may have been because of the 18 g i filled with the first time.
I’ve been told not to store vials upside down. I suppose an 18gauge needle could be why it was leaking, still odd though. I always draw with an 18gauge as does a friend of mine, though he’s been injected Testosterone for 5 years, and I’ve only been doing it for a short while. I’ll see if this has ever happened to him. The only time I’ve had my vial leak has been when I’ve put too much air into the vial to draw and my vial was still face down when I removed the syringe.
A rubber top on a vial of liquid medication should always form a hermetic seal for sterility purposes. Maybe an 18gauge could cork the rubber enough that it doesn’t reseal itself though. I’m sure someone on this forum has more experience and can provide an explanation that would help us both understand what happened to the top of your vial. I’m curious now myself.