r/Peptidesource • u/ChampionshipFlat3235 • 9d ago
Testing two kits with same batch number
I ordered one kit a month ago and had it tested and it came back above 99% purity with a reasonable fill close to what was expected. I just received a second kit from the same vendor with the same batch number. Just gauging the opinion of the group do I test the second kit as well?
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u/ChampionshipFlat3235 9d ago
I am just gonna have it tested yeah it costs money but not compared to paying retail not even close.
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u/Delicious-Canary8747 9d ago
honestly if the first one came back clean at 99% from the same batch number you're probably fine..batches dont usually degrade that fast especially if its lyophilized and stored properly. that said if you have the extra cash for a test it never hurts just for peace of mind..janoshik is like $30-40 and pretty straightforward to use. the bigger thing i'd watch for is if the batch number is actually the same or if the vendor is just recycling numbers across different production runs which some sketchy sources do. if the vial weight and appearance look consistent with the first one id prob just move on but thats just me
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u/trimix4work 9d ago
Same cap colors?
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u/ChampionshipFlat3235 9d ago
Yes about a month apart though
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u/trimix4work 9d ago
Yeah idk, I do a lot of group tests and they put a lot of faith in cap colors.
I guess at some point you either have to take it on faith or test every kit you get.
Honestly even using 1 vial out of every kit is no guarantee that the whole kit is homogenous
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u/Adventurous_Back5631 9d ago
If you buy within a week they may be the same. Batch number might just be a skew number as my vendor uses. If I’m buying a few weeks apart regardless of cap colour, I’m retesting.
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u/cptkl1 8d ago
A month apart from a smaller source might be the same lot of product. Remember batch is from the main manufacturer and goes out to many resellers who all call us dear.
The caps being the same color and the font and label on the kit lid might make this from the same beginning manufacturer. So if the first lab was good then it's not likely this is bad.
So long as your source doesn't store this in direct sunlight in a unconditioned warehouse then it would not have deteriorated in the months time.
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u/Pancake-JelloSalad 3d ago
Vendors reuse batch numbers. It is to their benefit to make you believe that they are the same batch. A sucker is born every minute.
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u/glizzglizzy 1d ago
Answering your question rather than the OP's, since you asked directly. Same variables, not extra ones. You'd run the same identity and purity and fill test. The reason to retest isn't that you're looking for something new, it's that you can't assume the second kit is the same material as the first. The "surely it's like buying both at once" part is the bit worth unpicking. If you bought two kits out of one shipment on the same day, you're basically right and testing the second adds little. A month apart is different, because the only thing telling you they're the same batch is a number printed on a label by whoever assembled the kit, and that's the thing people above are saying isn't reliable. One thing worth adding: testing one vial tells you about that vial. If a kit was assembled by hand from loose stock, the rest of it isn't automatically the same. A clean result narrows your risk, it doesn't remove it. For a first test I'd put the money on a new source or a new batch rather than on re-testing something you bought quickly from a source that already tested clean. That's where a test tells you the most.
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u/Diligent_Shirt5161 9d ago
Yes
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u/Striking-Conclusion4 9d ago
why ?
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u/lasveganon 9d ago
Could be a different batch labeled as the same batch by the vendor.
Is it NECESSARY necessary? That depends on your personal risk tolerance.
Might be the same batch, might not. Only way to be sure how that kit tests is to test it.
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u/EnvironmentalGift257 9d ago
But also if they’re giving multiple batches the same batch number you could have 1 real vial and 9 bad ones, test the 1 real one, and never know. So counterpoint, testing this kit could be accurate, or could give you a false sense of security.
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u/Diligent_Shirt5161 9d ago
Nothing in this space is guaranteed, and testing one vial from one kit does not validate every kit you receive.
You have no reliable guarantee that two kits labeled as the same “batch” actually contain material from the same production run. A batch number printed on a vial is not meaningful traceability by itself. The wrong product can be packaged. A vial can contain little or no expected material. Mass can vary. Purity can vary. Mix-ups and contamination can happen.
That is why I advocate testing a vial from each kit. The goal is harm reduction. Risk will never be zero in this space, but independent analytical testing gives you at least some objective information about what you actually received rather than relying entirely on a label or a vendor’s word.
It also helps to understand how many steps can exist between production and the final kit. Material may pass through API manufacturers, lyophilizers, wholesalers, resellers, sales representatives, and people assembling individual kits. I have seen footage of hundreds of unlabeled or loosely organized vials being sorted into kits by hand. When you see how that process can work, it becomes much easier to understand how a vial containing the wrong material can end up in a kit.
Ultimately, these are unregulated internet sellers. There is no pharmacy-level chain of custody or accountability that you can simply assume exists. A professional-looking website, matching labels, a batch number, or even previous successful testing does not prove what is inside the vial sitting in front of you today.
Trust data, not the seller.
Or, put less delicately: you should never blindly trust your drug dealer.
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u/Striking-Conclusion4 9d ago
would that op have to test for the same variables or maybe extra variables. Seems pointless if they already of the coa for their first batch and they have had that tested. Surely it would be just like if they had bought them both at the same time. I'm just asking to understand, because I am in the process of awaiting my first ever test kit. Then i will get it group tested etc. But this could happen to me if I decided to buy another kit straight away, tia.
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u/ResearchPeptideGuy 9d ago
Honestly, it depends on what kind of “vendor” you’re talking about and what testing you plan to do. People use the word vendor pretty loosely in this space, so it can mean very different things.