How come using Insulin Injector Pens are not very common for SUBq oil shots?

[strixsir]

I have used the insulin pens after filling empty sterile 3ml cartridges with Test C,

If you are using a high Frequency pinning protocol, why not use pens?

Have used a 30G pen needle and it is really convenient to use .

for alternate day or daily pins, They literally take 10 seconds to pin 0.2 ml SubQ.

How come peptide community uses them a lot yet i rarely see mentions of it for Oils? Not even TRT folks mention it much.

 

[Barney67]

With 3mL cartridge volume and most T being 250mg/mL, having to fill a new cartridge every week or two if you aren’t doing TRT doses is a PITA. Also the stoppers are uncoated butyl rubber.

 

[strixsir]

With 3mL cartridge volume and most T being 250mg/mL, having to fill a new cartridge every week or two if you aren’t doing TRT doses is a PITA. Also the stoppers are uncoated butyl rubber.

as long as the stopper is grey, it will be fine, zero degradation, though not ideal for long-term contact for sure.

i have vials filled from last year, literally zero particles.

and i am talking specially for people do high frequency pins, the pen is worth the convenience it provides.

even more if one has stacked multiple compounds, just use multiple pens.

 

[Mariusdr]

I think some people do here, there was a thread on the pens themselves. Think for daily TRT it probably makes sense (if you would pin subq daily anyway. It is similar to daily peptides, which I think are more convenient in pens, it’s just smoother and also less slin pins to toss away

 

[Photon]

as long as the stopper is grey, it will be fine, zero degradation, though not ideal for long-term contact for sure.

i have vials filled from last year, literally zero particles.

and i am talking specially for people do high frequency pins, the pen is worth the convenience it provides.

even more if one has stacked multiple compounds, just use multiple pens.

Does it make a difference tho, if you poke that grey stopper daily?
I used to use the pens for hgh, then i got lazy to do it every week and now i just pin with an insulin pin.

I know @bananafeet seems to have successful with it.

Post in thread 'Refillable injector pen'

Jan 19, 2026

Look at the difference in the colour of a syringe plunger verses these cartridges. There is obviously a different material being used. The syringes are probably natural rubber or a composite. The grey is probably silicone or butyl rubber which is more resistant to solvents....

• bananafeet

• 

 

[powerdiesel]

I do 0.30 mL EOD in a v2 injector pen with a 29g .5" pen needle and love it. Incredibly quick and simple. Every ~3 weeks I have to reload a cartridge but that takes me less than 60 seconds. Just pull 3 mL out of vial, put a vent needle in the cartridge, and push the oil in.

I put my injector pen in a baby wipe warmer on low heat the night before my injection and it goes in as easily as a peptide through a 33gauge.

 

[Mfras]

Because slin pins are dirt cheap and I get to pick my needle based on injection site- 30g 5/8 for sub Q GH or rare peptide use, 29g 5/8 for shallow IM in the delts for daily or trt 2x/week, 25g 1” for glute or ventro for higher volume or site rotation.

I don’t do oils subQ and my pharma TestC is thick as hell and even draws crazy slow with the bottle on a mug warmer till it almost hurts to touch

 

[strixsir]

Does it make a difference tho, if you poke that grey stopper daily?
I used to use the pens for hgh, then i got lazy to do it every week and now i just pin with an insulin pin.

I know @bananafeet seems to have successful with it.

Post in thread 'Refillable injector pen'

Jan 19, 2026

Look at the difference in the colour of a syringe plunger verses these cartridges. There is obviously a different material being used. The syringes are probably natural rubber or a composite. The grey is probably silicone or butyl rubber which is more resistant to solvents....

• bananafeet

• 

They have butyl rubber with some coating, i am banking on the odds that they dont degrade for a year atleast

insulin vials are made for multiple dosages so i think its fine while the pen system itself acts as aseptic environment.

 

[strixsir]

Because slin pins are dirt cheap and I get to pick my needle based on injection site- 30g 5/8 for sub Q GH or rare peptide use, 29g 5/8 for shallow IM in the delts for daily or trt 2x/week, 25g 1” for glute or ventro for higher volume or site rotation.

I don’t do oils subQ and my pharma TestC is thick as hell and even draws crazy slow with the bottle on a mug warmer till it almost hurts to touch

even i has peanut oil carrier, its pretty thick/viscous compared to MCT,


Its winter here in india and yet its all the same with pen use, takes 10 seconds.

 

[Photon]

even i has peanut oil carrier, its pretty thick/viscous compared to MCT,


Its winter here in india and yet its all the same with pen use, takes 10 seconds.

Peanut


MCT


Not sure about EO but id stick to peanut.

 

[BigDadd7]

as long as the stopper is grey, it will be fine, zero degradation, though not ideal for long-term contact for sure.

i have vials filled from last year, literally zero particles.

and i am talking specially for people do high frequency pins, the pen is worth the convenience it provides.

even more if one has stacked multiple compounds, just use multiple pens.

Where did you come up with that? There are plenty of noncoated grey stoppers that dissolve from solvents.

 

[Lokey]

I use them them. 0.6ml of 300mg/ml Test U once a week, I fill a cartridge every 5 weeks.

Haven't seen any stopper degradation but I know that's a concern some have.

 

[strixsir]

Where did you come up with that? There are plenty of noncoated grey stoppers that dissolve from solvents.

fluororesin coated butyl rubber stoppers are the industry standard for sealing insulin vials.

i buy from alibaba china but the vendor is 15+ year old with history but i trust that i will have standardized vials.

 

[Photon]

fluororesin coated butyl rubber stoppers are the industry standard for sealing insulin vials.

i buy from alibaba china but the vendor is 15+ year old with history but i trust that i will have standardized vials.

That's PTFE

I highly doubt you're getting PTFE for those prices..We pay quite a abit more to get them..on vials

 

[nathenking]

I use a auto injector pen for Tren A. Anywhere from 5-10 units per day sub q with a 29g needle

 

[strixsir]

That's PTFE

I highly doubt you're getting PTFE for those prices..We pay quite a abit more to get them..on vials

man you are such a bummer,

I have already inquired about it, Atleast the vendors claims to have protective coating.

i just hope china simple has it cheap so they do actually do it, I pay like 0.8$ per vial.

 

[BigTomJ]

I have 5 pens i use daily or almost daily.

Id never entertain the idea of using them for oils.

1: using them for peptides and gh and similar means the stopper and plunger are only subjected to water and BA vs BB in oils.

2: the force needed to push through a 30-31g will wear out your pens over time, guaranteed.

3: .5ml 31g insulin needles are essentially free.

4: it completely untenable as soon as you are using anything above TRT doses.

5: subq oils is cope, it isnt any more comfortable than a shallow IM, doing subq is not going to make any difference in your relative aromatization, and subq has less bloodflow than IM making it take far longer to break down the depot, leaving lumps.

 

[bananafeet]

Man I don't know why subcutaneous injections of steroid oils is a thing.

I can understand for lipophilic compounds like tren ace which is microdosed daily. But then you'd be better off so do a longer ester and shoot it intramuscular.

If you look on any vial of injectable steroids (besides suspensions) it clearly says "I.M Only". The only bad shots I've had have been subq, injected into fat or accidentally too shallow (like into the fascia).

The blood circulation is not adequate to deal with the preservatives and solvents. For higher solvent compounds like castor oil based pharma test you're asking for trouble.

Anyway just my old man rant. As for cartridges you can just draw with a 0.5ml insulin syringe and front load a luer slip syringe with a 30G needle head instead. Solves the issue of worrying about random shit from China being sterile.

You can buy cheap 100 packs of luer slip syringes and needle head for like $9 per 100.

I understand the whole "stable blood levels" but your balls don't make stable test levels anyway. It's just autistic masterbation. I've done blood tests where I waited for my levels to drop over two weeks and they were still elevated. So I don't buy this two or three times a week stuff. Long esters were formulated to allow for longer injection frequency.

Sorry for the rant.

 

[strixsir]

I have 5 pens i use daily or almost daily.

Id never entertain the idea of using them for oils.

1: using them for peptides and gh and similar means the stopper and plunger are only subjected to water and BA vs BB in oils.

2: the force needed to push through a 30-31g will wear out your pens over time, guaranteed.

3: .5ml 31g insulin needles are essentially free.

4: it completely untenable as soon as you are using anything above TRT doses.

5: subq oils is cope, it isnt any more comfortable than a shallow IM, doing subq is not going to make any difference in your relative aromatization, and subq has less bloodflow than IM making it take far longer to break down the depot, leaving lumps.

insulin needles are fine and cheap but its not like pens and vials are that expensive relatively (they are cheap as F) but they sure are convenient

You have a specific usecase of high dosages,

most folks pin in range of 100-500 mg weekly for each compound

for them, SubQ or IM does not matter much in higher frequency pins, 0.2-0.3 ml takes 10 seconds for me.

insulin vials come with fluororesin coated butyl rubber, there is no degradation in a few months.

on top, pens have a ridiculously high accuracy

 

[MadaFacor]

Man I don't know why subcutaneous injections of steroid oils is a thing.

I can understand for lipophilic compounds like tren ace which is microdosed daily. But then you'd be better off so do a longer ester and shoot it intramuscular.

If you look on any vial of injectable steroids (besides suspensions) it clearly says "I.M Only". The only bad shots I've had have been subq, injected into fat or accidentally too shallow (like into the fascia).

The blood circulation is not adequate to deal with the preservatives and solvents. For higher solvent compounds like castor oil based pharma test you're asking for trouble.

Anyway just my old man rant. As for cartridges you can just draw with a 0.5ml insulin syringe and front load a luer slip syringe with a 30G needle head instead. Solves the issue of worrying about random shit from China being sterile.

You can buy cheap 100 packs of luer slip syringes and needle head for like $9 per 100.

I understand the whole "stable blood levels" but your balls don't make stable test levels anyway. It's just autistic masterbation. I've done blood tests where I waited for my levels to drop over two weeks and they were still elevated. So I don't buy this two or three times a week stuff. Long esters were formulated to allow for longer injection frequency.

Sorry for the rant.

This. It was designed, manufactured, and approved for IM. Most serious enthusiasts, are not doing oils sub-q. It is a substandard delivery method and almost always causes lumps from the bolus except for in very small amounts.