I take my SS-31 daily with my Xulin 3. I use pens for peptides I research with daily or at least multiple times a week. That's where the efficiency really helps. You are taking a much high dose than I am, so I can't attest to the stinging. I'm using 4mg/day in preparation for a MOTS-C cycle. I might bump it up to 6mg/daily. I felt like the doses in the 20-40mg range were more aligned to the study for Barth Syndrome for major mitochondrial disfunction. My goals are more athletic recovery, performance, and healthy aging. Good luck!

@CapmanCrunch Thanks Cap. The largest volume I inject is 70 units (Tirz).

I have heard from a practicing MD - peptide researcher that mixing random peptides together as a blend is not ideal and better to be avoided. The reason is that different molecules may demonstrate unwanted interactions with each other, we just don't know enough of chemistry and don't have a research of how they will interact. For example they may stick to each other, block each other, even react chemically. He suggested to use different vials and syringes for each peptide and even spread them in time enough to avoid interaction with each other in the body, unless it is the intended effect that you want. That's what he does with his clients and he has a large clinical practice.

Vials make the difference… also the finer the needle, the harder it will be to press. I had the Xulin from here and it was smooth. I gave it to my friend and she loves it for her Tesa. The vials make such a hige difference. I have shitty vials, but they are smooth. Bit some good vials are a little harder.

@ResearchCat said: I have the same thing happen. I assume it’s because the vials are kept cold so the liquid volume shrinks and when I insert the needle, it draws a small amount of air into it. Probably also why sometimes the needle drips a little as it warms up. This doesn’t happen all the time for me. Oddly of the three pens I am running right now, only one is doing this. Hey, Thanks for the reply. Yes also the dripping issue is relatable - i didn't mention it in my initial post. I'll try next week filling some pens with "cold" vials - to see what' s what. I've also ordered a new batch of vials from a more allegedly more reputable manufacturer. Thanks,

There is an app called Peptide tracker which I have found to be great. There is some setup time to load everything but it works well

@emkay I am addicted to pens teh xulin is great

The 12mm are easy to find. I need 5 or 6mm

The instructions say each pen has 3ml of solution. That means 40mg mixed with 3ml liquid. Using Randy's handy dandy reconstitution calculator at https://peptidecritic.com/tools/peptide-calculator, you get the following. For each 1mg dose, you would turn the dial on your pen 5 units. [image: 1779799195531-screenshot-2026-05-26-073719.png]

Randy, I have a bunch of pens from Peptide Critic. I like the v 3.5, can you get it in a few more colors? Thanks.

@phiberopttic I think it was Jeff that mentioned that Xulin only make Blue pens normally, but do a run of Red for a limited time when launching a new product. I also bought both colours of it straight away, cos he said they were Randy's favourite. Red one is out for delivery today. I wonder if we can 3d print pen bodies.

@jagerman said in Can anyone recommend a pen that can push subq T: @kenhnsy v2 is manual right? Maybe I need to get a manual pen where I can push harder and steadier. V2 is manual and has the retracting cover. I like this because I can inject my girlfriend's big brown beaver with a lot of pressure to get into the muscle and no risk of slipping side to side. I recommend having a case since the open end on the pen exposes it to the world of microbes during storage.

@jackie said in Traveling with research material.: When I put my back up up and removed my ipad, I said "I have refrigerated medicine" and they told me to leave it in my backpack when I flew out. When we flew home, they had me take it out of the backpack and put it in the bin with my ipad. They didn't ask what was in it or even look at it Yeah have read from many others on other forums too that TSA doesn't give a fk about your meds in the cabin bag. Maybe they are researching them too and understand. LOL

Do a test pin with just BAC water or saline. If it still bruises it’s the pen/needle itself or the way you actually pin - if it doesn’t- it’s the pep.

i have bought 7 pens in total from 3 different vendors i've not had any jam up , that said i am a bit supicious of the accuracy of two of them

When I tested pens sometimes 5iu wouldn’t fire and on the next 5iu fire you get 10 iu (both doses). The issue doesn’t exist when firing 10iu.

I use 32g 4mm pen needles with w V2 pen. Hardly feel to pinning.

My pet hedgehog will sit for hours watching This is not Covered - Dr Froese on YouTube. He stumbled on her and liked the easy way she breaks things down in a real way. It really put him at ease when we started researching. We trust this channel as much as you can trust any channel and watching her channel evolve has been informational as well. Highly recommend starting with her channel for an intro. Also, @randy has done a phenomenal job gathering resources and providing information. The individuals in these forums have been a benefit to me as I read them. As you will see everywhere, start slow, monitor results, and do one thing at a time. Peptides aren't necessarily quick fixes; we research to optimize. Optimization takes time, monitoring through measuring, and patience. Everybody is a different body; keep that in mind as you begin. This is why monitoring and recording are critical in every science research experiment. Good Luck!

I realize there are a lot of Pen users, and can see the benefits of the Pens. For now I still use disposable syringes. I'm not an EZ touch only kinda person especially with their prices on the rise. I found CleverChoice EZ and SureComfort work just as good as EZ touch imo. For those of you who are still using syringes and are looking for a good price point, I found a site that offers a very good prices compared to EZ touch. If your state allows, ADW diabetes offers cases of 500 for $50 - $57 CleverChoice EZ and SureComfort, .3cc, .5cc and 1cc. If this isn't allowed, please let me know and I'll delete it Just thought it would be helpful for those looking to save some $$