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Anyone switch from syringes to a pen?

47 replies37 peopleSep 2, 2026☆ Follow
Summary

Do people prefer switching from syringes to pens for peptide injections and why?

Most users who have tried both favor pens for daily injections because they are faster, use sharper needles that cause less pain, and are easier for travel. Syringes remain popular for weekly doses or when users want maximum certainty about the exact volume delivered. Several people combine the two approaches depending on the compound and frequency, while a few stick with syringes due to lower cost and simpler setup.

What this discussion establishesWhere people disagree

Whether pens or syringes deliver more reliable dosing accuracy, with some trusting tested pens more and others insisting only syringes provide full certainty.

Still open

Long-term durability issues with pens and whether they suit every compound equally well.

Nothing here is advice.

47 replies · 37 people
BlueBramble39archiveopening postSep 2

Anyone who's sampled the two options, which one do you favor? Does the pen version turn out to be easier in daily use?

AmberAlder58archiveSep 2

I only use pens now and yes I find them far more convenient.

AmberMarble84archiveSep 2

Syringes bother me because they dull after drawing the peptides, making it harder to push through older skin. Pens are much simpler to prepare and use.

PatientFenwick55archiveSep 2

Syringes cost less with no extras but take more time with daily injections. They also feel more accurate since you can see the exact volume. Pens give sharper pokes, save time every day, and are easier to carry when traveling. They do have a learning curve around calibration, keeping cartridges sterile, blocked tips, durability, and occasional leaks. I like pens for daily use but stick with syringes for weekly or intramuscular shots.

WarmLantern16archiveSep 2
↳ replying to @AmberMarble84

I ordered one of the newer models. I am planning to start filtering so if I am drawing from the vial I may as well do that. I had not thought of it before but it makes sense. I got finer syringes for one compound because I heard they might help. But with the extra bac water I have noticed the second vial does dull the needle.

AmberLantern34archiveSep 2

Yes I love pens. The needles are sharper and there is less waste. I still have about one hundred fifty syringes to use up then everything I inject will be with a pen.

SteadyMarble26archiveSep 2

I use both. Pens for some daily and multiple times a week compounds and syringes for others. I use longer needles with the syringes because they help reduce the spicy feeling from certain pins. I have several different pen models and use short fine needle tips on them. I have a needle phobia but still do not mind self injecting, probably because the needles are very fine and cause no pain. I prefer pens but the spicy pins are oddly satisfying.

PlainAlder11archiveSep 2

I have considered it but I already have hundreds of syringes on hand.

SteadyFenwick51archiveSep 2

I do both depending on whether it is a daily or weekly compound.

IronFenwick84archiveSep 2

Pens for me. They are more convenient and let me filter straight into the sterile cartridge instead of needing extra vials. You just screw on a sterile tip and dial the dose instead of drawing a syringe each time. They are also simpler for travel.

SlowAnchor19archiveSep 2
↳ replying to @PatientFenwick55

I agree with that. I use pens for daily compounds and syringes for weekly ones.

IronSignal25archiveSep 2

I am afraid if I use a pen the thing will malfunction and inject the whole vial into me.

IronFenwick84archiveSep 2
↳ replying to @IronSignal25

The cartridge holder is clear so you can watch the liquid slowly being injected.

SteadyTimber22archiveSep 2

When I wanted a pen I went straight for the expensive auto injector types and bought three different ones to try. They all stuck halfway through the injection. I do not know if it was a sticky plunger, the fine needles, or the solution thickness. Now I use simpler pens or even the cheap disposables. If I provide the push there is no sticking. I also love how sharp the needles stay since they never touch a rubber stopper.

PatientBeacon17archiveSep 2

I hate syringes and only use them for reconstituting the peptides. I tried a syringe once and switched straight to pens. I currently have four pens in the fridge, two for me and two for my wife, holding different compounds. We love using the pens because they are easy and painless with the short thin needles.

QuietThistle70archiveSep 2

Every six weeks or so I use a syringe to salvage the leftover partial dose in used cartridges. I am a bit of a tightwad. I always think I am glad I do not do it this way anymore when I draw that partial syringe dose.

ClearBeacon24archiveSep 2
↳ replying to @AmberMarble84

I thought skin became thinner as you age.

SharpTimber80archiveSep 2

For everyday tasks I reach for pens but their precision falls short when handling reta so a syringe works better instead.

BlueSignal97archiveSep 2

I'm known as the injection chick around here. Getting the cartridges ready works fine for my child yet feels like far too big a production when I need them myself. The plain needles end up being way simpler and cheaper for my own use.

SteadyLedger60archiveSep 2

Pens for daily use and syringes for weekly. I have even switched my other regular injections to a pen for daily micro dosing. I fill the cartridge for a week supply then swap to a new one.

PatientFenwick55archiveSep 3
↳ replying to @IronSignal25

Pushing hard on the injector would be needed for something like that. Not long ago blood came upward into my device and spoiled the contents so I tossed the whole unit out. The one upside was just two doses remained anyway. It was still annoying though. I never realized that could even happen. Probably just hit a vessel by chance. Now I feel more wary around these injectors yet I keep taking the risk anyway. After the whole thing I switched to needles for that substance for some time.

QuietPebble46archiveSep 3

I got my initial device ready the day before. It seemed enjoyable and thrilling, like being in a lab or something. Still, syringes let me observe the exact amount being pulled out, unlike the markings on this tool where accuracy feels uncertain. I reserve this device just for those substances I take every day or several times weekly; for everything else, a needle works better.

IronLantern24archiveSep 3

My mind keeps changing on this. Pens are what I reach for every day when I need to inject. Maybe I'll hold onto those pens just for my father and switch completely over to needles instead. Managing two sets of pens sounds like too much trouble.

BlueBramble39archiveSep 3
↳ replying to @SteadyLedger60

That pretty much sums it up. I think I am going to get a pen too.

SlowCinder32archiveSep 3
↳ replying to @PatientBeacon17

Because all the pens sit together in storage, do you add markings so each one stays recognizable?

PatientBeacon17archiveSep 3
↳ replying to @SharpTimber80

Yes and no. There are many pens that are not accurate that is true. But you can test the pen first by filling an empty vial with three milliliters of water and checking the output. A good accurate pen will deliver almost exactly the expected units with under one percent difference. My experience is that with a good tested pen you get more accurate doses than with a syringe. The four pens are all different colors so I can tell them apart without labels. The fluid in one is also a different color so it is easy to see which is which. If they were all the same color then labeling would make sense.

ClearLantern70archiveSep 3

I like both for different reasons. I use a pen for one compound but syringes for everything else. I filter everything. I can find sterile pen cartridges cheaper than sterile vials and the tips are cheaper than syringes. So in the long run pens are less expensive in my opinion. But I will never inject my main compound with one. I like the confidence of consistent dosing with an insulin syringe.

RustTimber85archiveSep 3

I have switched to a pen for daily injections and love it. I still use a syringe for the weekly main compound.

BrightMeadow15archiveSep 3
↳ replying to @ClearLantern70

Building assurance might come from loading a measuring tube with liquid and checking the weight of what gets dispensed. The adjustment mechanism works with precision, so locating cartridges I can rely on makes the whole process straightforward. Sticking with divided portions keeps things comfortable as well. Back when handling small quantities from a thick-fluid container the injector never gave me peace of mind.

ClearLantern70archiveSep 3
↳ replying to @BrightMeadow15

I agree I could do that. It would boost my confidence but it would still only be about ninety five percent. With a syringe I feel one hundred percent confident.

PatientBeacon17archiveSep 3
↳ replying to @ClearLantern70

Experiences vary a lot. For me dosing with a pen is more accurate than with a syringe. With a syringe you never hit the exact line perfectly. With a good accurate pen you fill the cartridge with the reconstituted peptide using three milliliters of bac water for example. Then you can calculate the dose per unit and dial the right number of clicks. It has worked well so far. Combined with the reduced pain from the pen needles I see no reason to go back to an insulin syringe.

WarmLantern16archiveSep 3

Mine arrived today. I am going on holiday tomorrow so there is no point making up a vial to test but I could not believe how short a five millimeter needle is. I think I have been going a bit deep and pinching the skin every time. I even pricked myself with it to see and it felt like nothing.

AmberMarble84archiveSep 4
↳ replying to @ClearBeacon24

It does become thinner but maybe not so much on the stomach. I do not know maybe I just have weird menopause skin.

BrightCompass57archiveSep 6

Syringes are simple and easy. No need to add any extra costs with a pen.

LevelAlder29archiveSep 7

I use pens for daily or two to three times a week injections and syringes for weekly doses though I will be trying a pen for one weekly compound soon. I test all my pens for accuracy by filling a cartridge with water and injecting into a syringe. I like pens because injections are quick and it is easy to reach awkward spots. The needles are also super sharp since they never puncture rubber. Syringes are nice because there is no prep work. I do not find the pen prep too hard though it is mostly just purging air and priming until drops come out. Later I add a spacer to get the most from the cartridge.

AmberMeadow80archiveSep 7

My full switch to pens is nearly complete. I run daily compounds and twice weekly another in a pen. I have one more pen arriving next week for a different compound.

IronLantern24archiveSep 7
↳ replying to @LevelAlder29

I have the exact opposite problem. I find it hard to inject in that area even using a pen. I just finished another round of one compound five days ago and I still have sore spots. I even used longer needles this time. I have never had that issue with syringes. It is weird.

WarmAnchor39archiveSep 7

Yes the pen is definitely more convenient. My memory is not the best so I like labeling mine with the day I use it.

QuietThistle52archiveSep 13
↳ replying to @SteadyLedger60

What pen are you using to push that thick solution?

WarmLantern16archiveSep 13

I loaded up my first pen today with one compound. I thought I had planned it well but ended up fiddling a fair bit and even forgot the filter. I am now thinking of what little stands or accessories I can make to help. I am much happier with how the process works now and I am sure next time will be smoother. I have a couple more compounds to load when the next pen arrives. I only had one pen today so I could only do one but that is probably good so I can think things through. Most importantly I loved the tiny short fine needles.

GreyAnchor47archiveSep 13

I went ahead and ordered a collection of V4 models. I doubted whether switching to pens would create any real improvement, yet the results proved me completely wrong. The shift turned out massive from my perspective. Even though I already own plenty of syringes, I intend to get additional pens for using those alone from now on.

SlowAnchor55archiveSep 13
↳ replying to @GreyAnchor47

Try the spring loaded auto injector type. It is more expensive. I have one of those and two of the simpler pens.

GreyAnchor47archiveSep 13
↳ replying to @SlowAnchor55

Thanks for the recommendation. I have been looking around but have not decided yet.

GreyCompass76archiveSep 16

Those spring loaded pens are great. I use five of them right now for several daily compounds and even some weekly ones. It is so easy to just pop on a new tip and turn the dial when I am in a rush in the mornings. Very worth the few extra minutes of setup in my opinion.

AmberCinder18archiveSep 16

It is a good question. I honestly do not know how much of an issue that would or would not be.

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