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c/researchpeptides·posted 1 year ago by u/heart_rate_bump

[PSA] thymosin is not what most of this community thinks it is

Lab Cold Box ×7 Long Haul ×2

Writing this once so it can be linked instead of retyped: thymosin is not what most of this community thinks it is.

Sent an unusual compound to VendorInvestigate because nobody on this site had ever posted one. 98.6% against a claimed 98.5%.

Asked for identity confirmation on an unusual line and got a mass spectrum with the theoretical mass alongside. That is the answer I now look for everywhere.

Ordered under a name that turned out to cover two different molecules. Nobody’s fault but mine for not asking.

Would rather be corrected in public than confident in private.

2,670 up / 338 down89% upvoted11 commentsid 1m0pm819 Nov 2024

11 comments

4 in this archive, depth 3

best — the order this archive was captured in

u/insulin_syringe_ian396 points·1 year ago

Purity methods differ by compound class. A gradient and wavelength developed for one peptide will not necessarily resolve the relevant impurities of another.

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u/heart_rate_bumpOP256 points·1 year ago

Bought small on anything without a testing history here. That rule has never once cost me anything.

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u/laila_almeida313 points·1 year ago

identity before purity, every time, for anything unusual

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u/marit_mensa-20 points·1 year ago

Same. Net peptide content is where the difference between the label and the vial actually shows up.

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About c/researchpeptides

The wider research-peptide catalogue: thymosin fragments, GH secretagogues, melanocortin agonists, and the long tail of three-letter analogs. Focus on identity verification, handling and the state of the evidence — not on protocols, because these are not approved for human use.

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