So, I bought some CarePoint Precision 3mL 22G 25mm Luer Lock Syringe 100ct - for drawing out the bac water and putting it in the vial. I'm not sure if that's the best size for that. The needle seems kind of big. What do you think?

Apologies if this is the incorrect place for this post. I figure it has to do with pens, so this may work?

I've recently made the switch to peptide pens and have become a huge fan of the convenience and consistency (thanks Randy!). Since I'm also on TRT, I started wondering whether testosterone could be used with pens as well.

After finding a forum thread where several people were doing exactly that, I decided to run some tests of my own.

Goal: Determine whether Testosterone Cypionate can be delivered accurately and consistently through a peptide pen.

Setup:
Pen: ConviPen (auto-injector)
Testosterone: Testosterone Cypionate 200 mg/mL in cottonseed oil
Needles: EasyTouch 29g 1/2" pen needles

I chose the ConviPen because it uses a metal drive rod and I suspected an auto-injector would have an easier time pushing a more viscous oil. I am still considering testing a manual pen (V4) for comparison.

Testing Performed:
Test #1: I loaded a cart into the pen and measured output directly into an insulin syringe. To do this, I inserted the syringe into the cart and dispensed a dose from the pen, allowing me to measure the volume.

Approximately 10 repetitions were performed.

Result:
Output was extremely consistent.
15 units delivered essentially what was expected each time.

Test #2: I then attached a 29g pen needle and repeated the testing by dispensing through the needle into the open end of a syringe. This method was less precise than Test #1, as some of the oil adhered to the sides of the syringe and could not be measured perfectly.

Approximately 30+ repetitions were performed.

Result:

Output remained consistent.
Measured delivery was roughly 1 unit lower than expected.
Because of this, I began testing a setting of 16 units to achieve an effective 15-unit delivery.

Test #3: I then did an actual subcu injection for my regular dose. When I pressed the trigger at 16 units, the dose indicator rapidly dropped to approximately 5 units remaining, then continued clicking all the way down to 0. I left the needle in place for approximately 10 seconds after the indicator reached 0.

This behavior was very different from my syringe testing and raises the question of whether tissue resistance affects delivery compared to bench testing.

Preliminary Conclusions:
• Testosterone Cypionate in cottonseed oil can be delivered through a peptide pen.
• A 29g pen needle appears to work (shout out to the forum users who stated this in another post!!)
• Pens are mechanically capable of pushing oil-based testosterone.
• I still need long-term validation through TRT labs to confirm that Total Testosterone and Free Testosterone remain consistent with pre-pen values.
• I am unsure whether an auto-injector or manual pen is ultimately the better platform for oil-based compounds.

Questions: For those who have experimented with TRT in peptide pens:
• Have you found auto-injectors or manual pens to be more reliable?
• Has anyone validated dose accuracy through bloodwork or measured output testing?
• What are some other factors I should be considering?

I'm still early in this experiment, but so far, things are looking promising!

P.S. For those wondering, I wasn't burning through my actual TRT supply for science. A friend had an old blended testosterone vial that was never going to be used, so it became the sacrificial test subject for this project.

This is a vendor review submitted by chris on PeptideCritic.com.

Rating: (5/5)

Review

I can honestly say Studz Peptides has been one of the best vendors I’ve ever dealt with, not just in this space, but in any space period.

The first thing that stands out is how fast they are. Their processing time is the fastest I’ve ever seen. Orders are handled quickly, shipping is fast, and they even offer shipping insurance, which gives you extra peace of mind. From start to finish, the entire process feels smooth, professional, and reliable.

Their customer service is also top-tier. They actually care about the people supporting them. They’re easy to talk to, respectful, and willing to work with you through anything. If there’s ever an issue, they make it right instead of brushing people off. That alone says a lot about the type of people running the company.

The prices are amazing, especially considering the level of service, speed, and care they provide. On top of that, they’re constantly running sales, giveaways, and opportunities for the community. It never feels like they’re only in it for the money. It genuinely feels like they are here to help people, build something real, and take care of the people who support them.

Another thing I respect is how open they are to feedback. They listen to advice, take suggestions seriously, and are always bringing in new products based on what the community wants. They continue to grow and improve instead of acting like they already have everything figured out.

They also provide COAs and are constantly having products tested, which shows they care about quality and transparency. That level of accountability is important, and it’s one of the reasons people continue to trust them.

The community around Studz is another major reason they stand out. It’s not just a vendor; it feels like a real group of people helping each other. The brothers running the company come across as genuine, honest, and passionate about what they’re building. They treat people like family, not just customers.

Between the fast shipping, insane processing times, great prices, constant sales, giveaways, ambassador opportunities, customer service, testing, transparency, and the community they’ve built, Studz Peptides is easily one of the best companies I’ve ever supported.

I would recommend them to anyone looking for a vendor that actually cares, listens, and goes above and beyond for their customers.

Shop StudzPeptides

Read the full review: Overall best vendor I’ve ever done buisness with

Discuss this review, share your own experiences, or ask questions about the vendor.

Please keep discussions respectful and factual.

Who is your favorite peptide influencer right now?
Mine Dr Trevor Backmeyer, Andrew Huberman and *Peptide Critic.

I apologize if this has been answered before of if the answer is intuitive. I have never used the pens before and am getting ready to load my first pen.

I understand how to use the pen for a standard dose (I.e., click up the number units needed). My question is, when you near the end of the cartridge, how can you determine if you only a "partial" dose remains and if a partial dose is administered, the amount of such partial dose? I want to be able to complete the dose with the next vial/cartridge but need to understand better how to determine that amount?

With the syringe its easy to determine how much is in such partial dose and how much more is needed.

Please advise with any insight regarding the pen (I have a V4).

Thanks.

Hi all, new to filtering peps and pens, just ordered 3 V4s from the shop! I watched Randy’s vids, and I have the following supplies down:

3ml sterile pen cartridge vials
3ml 23G 1 inch luer lock syringes with needles
0.2um 13mm PES filters
30G 0.5 inch luer lock needles

My question is, what gauge should the breather needle be? If there’s anything in my supplies list that stands out, or I’m missing, please let me know. Thanks all!!

https://www.unilad.com/news/health/retatrutide-warning-man-dies-469340-20260702?fbclid=IwY2xjawSzx6dleHRuA2FlbQIxMABicmlkETE5UHN2TmE3OUtRTTNlME1Cc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHgy-QKrFGD1hcjQi3vqymXqpubgnVMRtLHtX9C6zcBMau_7LxUFBSNmc_3xO_aem_V5nxot4beXNPV109vVDSsA

This is a vendor review submitted by WesEqualshXc on PeptideCritic.com.

Rating: (5/5)

Review

Have you ever developed a crush on somebody and couldn't help but want to text them? Yeah, that happened to me with this company. After I received my first order, which shipped pretty quickly, I found myself going back to their website several times debating whether or not I should spend the money to buy more stuff. For my money, they strike a perfect balance between price, packaging, convenience, and detailed COAs. I’ll probably continue to buy from these guys.

Shop Crush Research

Read the full review: I’m developing a massive Crush!

Discuss this review, share your own experiences, or ask questions about the vendor.

Please keep discussions respectful and factual.

Can anyone help me with a realistic protocol for Epitalon? Jeff and @randy have published one but the dosage seems so high, 5mg straight off the bat?! The vial is 10mg. I want to use it to help me deep sleep, is anyone using smaller doses?
Thanks

Happy 4th Peptiders. On this day, let's agree to never vote for any of these members of Congress who are beholden to Pharma.

Top House Recipients (2024 cycle, all $200+ from pharma sector) OpenSecrets

Anna Eshoo (D‑CA) – $2,250,016

Frank Pallone Jr. (D‑NJ) – $2,211,461

Kevin McCarthy (R‑CA) – $2,194,977

Bernie Sanders (I‑VT) – $1,949,772

Brett Guthrie (R‑KY) – $1,858,283

Fred Upton (R‑MI) – $1,836,471

Richard Burr (R‑NC) – $1,638,226

Scott Peters (D‑CA) – $1,584,916

Charles Schumer (D‑NY) – $1,555,659

Robert Menendez (I‑NJ) – $1,471,841

Notable Senate Recipients (2024 cycle, all $200+ from pharma sector) OpenSecrets
Sherrod Brown (D‑OH) – $1,097,227

Lisa Blunt Rochester (D‑DE) – $331,402

Jacky Rosen (D‑NV) – $341,471

Nikki Haley (R‑SC) – $391,185

Jon Tester (D‑MT) – $576,423

Bob Casey (D‑PA) – $624,574

Jeff- kindly relocate if not appropriate for a new category.

Multi-vial care package delivered today from BioLongevity, pinned both with 30 minutes between each. No site reactions, feel fine, great actually.

Super intrigued by both, I've done my homework. 60's male in great health, 2.5 year carnivore, focused on maximizing healthspan. Anyone else throwing caution to the wind and researching these two?

I'm about 3 weeks in with peptide research. My initial intention was to begin this journey a year ago, but I never committed. My test subject is experiencing significant inflammation along with widespread aches and pains, leading to a sense of desperation regarding available treatments. I've sourced peptides from a few outlets and am looking to explore additional sources and share my experiences so far. I appreciate the resources available on this site and am thankful to have discovered it.

I know you all love your Hospira bac water. MedexSupply has it on sale.

Save some for me!

Feel free to move if this is in the wrong category.

I am new and having a hard time finding good suppliers for the UK. I've done some research and have heard of Bluewell Peptides & PeptiMax UK as reputable, but could anyone who knows more than me, check if these are legit please, or if they know any reputable sites. I dont mind any good EU sites as long as their prices are reasonable. Please push me in the right direction

I am trying to get Bpc-157 and TB-500 and move on KLOW if all goes well with the first time.

Also, as I cant get any pens from this site, where would you recommend getting a pen.

I've heard of very few who have not regained their weight, sometimes more, once they stop Semi/Tirz/Reta. There are some that claim to not have regained the weight, or a large portion of it but no proof to back it up that I know of. It's possible; I just don't know any of them.

Most of us here at least have the notion that we're probably going to be taking weight loss peptides for the rest of our lives, with the only other choice being micro-dosing, instead of higher doses.

The 'therapeutic dose' of Tirz is 5mg, therefore, IMO, anything under that is micro-dosing. I know lots of experts are saying 2.5 or less are the levels, but that doesn't make sense to me. Whatever.

I'm at 6 Tirz/1 Survo right now and after a month-long stall after dropping 30#'s, my weight is starting to drop again due to the Survo, albeit slowly. Think it's going to be this way for the next 20 lbs that I need to lose, unless I really exercise hard (Not likely)

Anyone else considering micro-dose? Doesn't mean you have to give up the other peps, just the ones for weight loss.

Saw this firework and had to buy it.....

Happy 4th eveyone!

FOODIE HERE! Looking to expand my recipe rotation and would love to know what you are fueling your bodies with. Trying to eat with intention while breaking old habits and still maintaining flavor. Please share your favorite high-protein dishes and recipes.

Currently obsessed with at home salmon & tuna poke bowls.
brown rice or cauliflower rice
salmon/tuna or both
avocado
green pepper
red onion
carrot
cucumber
green onion
spicy mayo
wasabi sauce
unagi
masago
sesame seeds

Lately, I've been seeing actual counts in CoA's for Heavy metals testing. Usually I see ND but this has got me wondering about the ND. Is it really that none has been detected, or is it that it's in the acceptable range so they put as ND and a PASS?

Example of one that contains actual numbers;

My very sweet husband‘s rat is very worn out. He has lost 20 some pounds on Reta and is doing great on his wolverine for the various peaks and pains. He is ready to add another protocol and want something to get his energy back.

Do you all recommend SS-31 with MOTS-c or NAD + buffering? Or something that I haven’t heard of?

Can anyone point me to a website or discussion that can help me figure out how to read and understand my rats bloodwork results and how to determine what peptides might be beneficial for those functions to improve?