FreeSpectator8
New_Member
I got lambda water BAC water, and Quality Research Chemicals AA, we will see how it goes. Bought PH test strips to see if they can work instead of having to buy a 50+ dollar PH tester.
Reconstituting agent for Cagrilintide
- Thread starter Christine S
- Start date
JohnnyGobbs
New_Member
Yea I used the strips. They worked fine.
As I am more concerned with stability after recon, I read this a couple times to absorb this..... it makes sense. Thanks for adding your experience.
NN is explicit that fibrils do form in cagrilintide, in both that research paper and in the patent. I have quoted those sections extensively across these threads. In the research paper, yes, they use a test that puts it in relatively extreme conditions vs. what is going to be seen after it is reconstituted by most people here, but we don't know what it looks like on the manufacturing side, how roughly it is treated there, how it is stored, etc. The patent filing uses a significantly less torturous test, but we still see fibril formation in the longer term with that test as well.
Part of the testing in the paper is to determine if fibrils are formed. I have never claimed this makes it dangerous - I have explicitly said I do not understand enough about the science to know if these fibrils truly are dangerous. What I will say is that in the testing conditions in the paper and the patent filing, they do find that cagrilintide produces fibrils.
You're writing a whole lot that doesn't actually say anything one way or other about the concern. No one is arguing that the PH remains low in your body.
No one has produced details on what PH is being used for the single chamber pen - we seem to be assuming it is a higher PH, and I wouldn't be surprised if that is the case, but they might also be going with a lower pH for the entire solution, unless someone has evidence that semaglutide is harmed at the lower pH.
Again, the patent involves a significantly more gentle test, at temperatures below 100F and just doing 100 end-over-end inversions of the vial on the liquid form of cagrilintide + buffering agent each day.
I've also been quite explicit my primary point is we have no idea what is happening with the manufacturing before the lyophilization. How long was it in the pre-lyophilized state? What pH was it manufactured at and stored at in between? What were the conditions during that time period? If I thought that just reconstituting it at a lower pH solved all ills, I would be using cagrilintide myself - I'm certainly confident in my ability to lower the pH of a solution. All I've said about it in reconstituted form is that if I had decided to press on and use it regardless of the rest, I would filter it and reconstitute at a lower pH to do what I could to prevent further fibril formation.
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No one should be taking anything I say as anything beyond my own layperson interpretation of the paper and patent filing, lol. I'm certainly no expert.
Appreciate your humble and thoughtful approach to all this. I think one of the reasons these conversation get ugly is that team fibril has several vocal members (leaders?) who are… ummmm… less measured in their tone and less lucid in their language. Your interpretation was helpful.
Thanks!
My biggest worry in engaging on all of this is people assuming I'm some sort of professional and taking my opinion as anything more than a nerd reading papers and interpreting them to the best of his ability.
TooBigtoFail
New_Member
Great discussions. Google AI results say it may be over the course of 10-20 years of accumulation before plaque forms. Specific conditions. Is there enough material in Cagri 2.5mg weekly, taken for 6 months to be a concern? These are all relatively young GPL medication. In a study, to create fibrils, they had to keep the temperature near 37celcius for days and then use a 0.22um filter to count them(fibrils measure 10nm) Am I to conclude that using a .22um filter would remove them? Should I be filtering my grey market peps anyway as I expect to stay on maintenance for 1 or 2 years after I reach my goal? A survey on filtering?
.22um is 220nm, so individual fibrils would still pass through.
My understanding is fibrils do tend to clump so you could potentially filter out any large enough clumps, which is why I would personally filter if I were to decide to use cagri.
JohnnyGobbs
New_Member
I know but your rebuttals and skepticism are pretty solid. Debate is healthy.
JohnnyGobbs
New_Member
I haven’t taken the leap to use a syringe filter yet only the lower PH. Haven’t learned the whole syringe filter process. Does anyone have a link of which one to buy?
FreeSpectator8
New_Member
From the paper on Oral Semaglutide: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2019/213051Orig1s000ChemR.pdf
"Semaglutide tablets are co-formulated with 300 mg of salcaprozate sodium (SNAC, a
permeation enhancer). The isoelectric point of the semaglutide is 5.4. The peptide has a
low solubility at pH range 2-6. Semaglutide is considered a BCS class 4 molecule (low
permeability and low solubility). It is hypothesized that SNAC facilitates the oral
absorption of semaglutide in stomach either by transiently increasing the transcellular
permeability in gastric epithelium or through buffering action on the local environment
near the site of action to provide a high pH and thereby protecting the semaglutide from
degradation."
Additionally:
A Review on the Efficacy and Safety of Oral Semaglutide - PMC
There are numerous treatment options currently available for patients with type 2 diabetes mellitus; however, a multitude of patients continue to have inadequately controlled glycemic levels with their current antihyperglycemic regimen. Furthermore, ...
pmc.ncbi.nlm.nih.gov
So there you go as far as your question about how we can say they likely aren't lowering the PH of the CagriSema mixture. Especially since the custom designed Cagri to be soluble and long term stable in a pH up to 8.
Again, no, part of the paper was not to find if fibrils form in cagri this is already a-given, as the chemical type that is the basis of Cagri will fibrillate. The whole point of the experiment was to find the best chemical composition that resisted fibrillation the longest and best while providing the best effect and any other sought after qualities. These tests would be used to simulate the maximum amount of degradation the product could possibly experience in its good til shelf life.
It is a false equivalence to say that because Cagri CAN fibrillate, then it DOES fibrillate. This is simply not true.
NN is not going to open itself up to liability of long term health effects caused by there drug because they figured it "probably wouldnt be a problem" they have a duty to test to the fullest extent and guarantee individuals safety. Not to mention the class action lawsuits that could and would happen if it became obvious they had shipped a product that can and will degrade and harm you during its shelf life.
As far as manufacturing concerns, there is only one way to create the specific formulation that is cagrilinitide, that's kind of how chemicals work. Any sort of impurities will come up in a purity test from janoshik, and if the chemical is wrong it wont match the sample that janoshik or any other testing party uses.
penewbie
Member
There were lots of kinda dodgy things you said in that comment.
But this specific sentence is so egregiously wrong it actually made me laugh.
I don't know how applicable the oral semaglutide formulation is, but I'll accept it as being 1:1 for the sake of argument.From the paper on Oral Semaglutide: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2019/213051Orig1s000ChemR.pdf
"Semaglutide tablets are co-formulated with 300 mg of salcaprozate sodium (SNAC, a
permeation enhancer). The isoelectric point of the semaglutide is 5.4. The peptide has a
low solubility at pH range 2-6. Semaglutide is considered a BCS class 4 molecule (low
permeability and low solubility). It is hypothesized that SNAC facilitates the oral
absorption of semaglutide in stomach either by transiently increasing the transcellular
permeability in gastric epithelium or through buffering action on the local environment
near the site of action to provide a high pH and thereby protecting the semaglutide from
degradation."
Additionally:
"The effect of pepsin on oral semaglutide stability was most profound at low pH, with oral semaglutide being most labile toward pepsin at pH 2.6 (t½ = 16 min)" Its clear that Semaglutide is unstable at low PH and will degrade quicker, making storing it in a low PH solution not ideal.A Review on the Efficacy and Safety of Oral Semaglutide - PMC
There are numerous treatment options currently available for patients with type 2 diabetes mellitus; however, a multitude of patients continue to have inadequately controlled glycemic levels with their current antihyperglycemic regimen. Furthermore, ...
So there you go as far as your question about how we can say they likely aren't lowering the PH of the CagriSema mixture.
Except that they explicitly say that Cagri does not meet their design thresholds at the 7.5 pH, much less 8. If it did, why would they have bothered developing the dual chamber pen and keeping it at a lower pH to begin with? They obviously had a reason at the time, considering the additional cost and complexity incurred.
You seem to be arguing semantics here. Yes, of course they knew fibrils could form. I believe from context it is obvious that the discussion is about the timelines and conditions for fibril formulation.
If we're going to be arguing semantics, in your previous portion of your text, you explicitly said "cagri will fibrillate."
The other paragraph is the whole crux of the conversation and what set this all off to begin with: NN, for most of the time cagrilintide has existed, was focusing their efforts on storing it at a low pH, with all of the research papers and patent filing showing a higher tendency to fibrillate at higher pH.
What are you even talking about? Nothing I discussed in my manufacturing portion would mean using a different formulation. It was explicitly about pH, temperature, amount of abuse it suffers, etc. If it sits around on shelves in a hot warehouse for a month and then takes two weeks in a hot trailer as it moves from the raw manufacturer to the finisher, vibrating along the roads, that environment is suddenly getting closer to the sort of stress seen in the the research paper and patent filings where they found fibrils forming.
Also, we already know we often get different forms of these peptides from China and the compounding pharmacies - we get them in their salt forms, which is part of EL and NN's whole argument about them being potentially unsafe.
Nothing is 100% on purity tests - we don't get a report saying that the .7% impurities are fibrils and oligomers or whatever. And other substances won't show up on the purity test - you certainly don't see the excipient in there, etc. It's just the purity of the peptide itself, despite most people thinking it is a vouchsafe for the rest of the contents in the vial.
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FreeSpectator8
New_Member
Ok, sure go ahead and explain how you plan to get the compound known as cagrilintide, without creating the exact same chain of compounds, as seen here:
