Peptide Critic Community

@hunt_ak This is 100% spot on advice. GLP's are great tools but should not be a crutch, at some point ppl are going to have to learn to eat properly. weight loss should be a long-term goal. Losing weight too quickly will result in even more excessive skin that will not be able to rebound. There should be adequate protein and abso-fucking-lutely be weight training involved. I wish the OP success in their journey...but it all comes down to calories in VS out, to which the GLP's shine. Use your tools wisely!!!

Stevepep awesome, glad to hear that you are all healed up. Yes it is fantastic stuff for sure.

@Stevepep hopefully you are not doing touch and go deads, that will eventually get you. I have seen a lot of people hurt themselves doing touch and go, and then blame deadlifts for their spinal issues.I have never had an issue doing deadlifts, now sneezing or tying my shoe can be sketchy

@Stevepep

@randy, thank you sir

I have been buying from peptidetest.com
https://peptidetest.com/products/pfizer-hospira-bacteriostatic-water-30ml-vial

I have had geat success with bpc for a shoulder injury. Had limited ROM and within 2 days there was significant improvement. I was very skeptical at first but the improvement continued until full recovery. I was going to PT 2X a week for 3 months with no improvement and then I decided to try bpc and dropped my PT completely.

@pc.envy I just started using my v1 pen with 29g 1/2 @40u, subQ. I have only filled my cartridge with 2.5ml. it's a slower push with the 29g.

@diesel after doing some research on the ISO standards. The rubber the pen cartridge is not natural rubber and more of a butyl type rubber/ synthetic (grey) ,made to withstand chemicals breakdown. I did cross reference with AI and pulled up the following info. I understand that AI isn't always reliable, but it's a lot faster at gathering info than what I can do, and a little common sense can filter out the not so accurate info....take this for what it worth, but I am not too concerned about the "rubber" plunger...besides @randy, I don't think that he sells shit products on his site.

For a 3ml pen cartridge (typically used for insulin, GLP-1, or other injectable medications), the "rubber" component is the plunger (stopper).
While ISO 11607 governs the outer pouch you showed earlier, the rubber plunger itself must meet much stricter standards because it is in direct, long-term contact with the medication.

1. The Material: Bromobutyl or Chlorobutyl
   In 3ml cartridges, the "rubber" is almost never natural rubber. It is typically Bromobutyl or Chlorobutyl (Halobutyl) rubber.

• Why? These materials have extremely low gas permeability and high chemical resistance, ensuring the medication doesn't evaporate and oxygen doesn't get in.
• Coatings: High-end cartridges often use a Fluoropolymer film (like FluroTec) over the rubber. This creates a physical barrier so the medication never actually touches the rubber, preventing the rubber from breaking down.

2. ISO 11607 and the "Container Closure System"
   ISO 11607 requires that the Packaging System (the pouch) does not negatively affect the Container Closure System (the cartridge).

• Chemical Migration: The standard mandates that gases used in sterilization (like Ethylene Oxide) must be able to pass through the pouch but must not react with the rubber plunger in a way that causes it to swell or become "sticky."
• Leachables & Extractables: Under ISO 11607 and related pharmaceutical standards (USP <382>), the rubber must be tested to ensure that no "plasticizers" or chemicals leach into the 3ml of liquid. Because the volume is so small (3ml), even a tiny amount of chemical breakdown can ruin the concentration of the drug.

3. Resistance to Chemical Breakdown
   To comply with medical standards, the rubber in your 3ml cartridge is tested for:

• pH Stability: The rubber must not change the acidity of the medication.
• Glidability: The rubber must be treated (often with medical-grade silicone oil) so that it moves smoothly. If chemicals from the sterilization pouch or the drug itself break down this lubricant, the "pen" will jam or deliver an incorrect dose.
• Cross-linking: The rubber is "cured" during manufacturing so that its molecular chains are locked. This prevents chemicals from "attacking" the material and causing it to crumble or dissolve.
  Summary of Protections

Are you concerned about a specific chemical (like a cleaning agent or a specific drug) reacting with the cartridge, or are you looking for the validation paperwork for a specific brand?
Cheers

@theckman80 good to know, thanks. I don't do daily, just 2x a week.

@diegoc thanks for the info

@diesel thanks for the info, also using test C in gso.
I did manage to find some 29g x 12.5mm. Degrading rubber is a little concerning, would have thought that medical grade rubber wouldn't break down in oil, unless the gso is the issue.

Figured since this was a dead area that I would add something
Strength training is one of the best things that you can do for longevity.
5/3/1 is a great program and the link below has a fantastic program generator
https://blackironbeast.com/5/3/1/calculator

There is info here https://peptidecritic.com/peptides/testing-providers

Also, peptidetest.com offers group testing, not sure of prices.

Thanks for the response. Yes I have the Lure Lock 27g for injections, just trying to avoid having to use a draw needle and an injection needle. I'm sure the 30g x 8mm pen tips would work might take a hella long time though for 40u. of oil.

Just wondering if anyone has used a V2 pen for TRT (sub Q) , if it is even possible, largest pen tip I can find is 30ga.