The Lab

Preppin Peppers' research library. Reconstitution guides, a growing peptide reference database, and bench-ready calculators, all in one place. For research and educational reference only.

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The Lab

The absorption shortcut only the smallest peptides can use
The absorption shortcut only the smallest peptides can use

Tripeptides unlock the PepT1 proton-coupled transporter, bypassing the saturating sodium transporters that limit free amino acids and larger peptide chains. Read more...
Protect your vials after the FDA's peptide panel vote
Protect your vials after the FDA's peptide panel vote

Protecting Your Research Vials Protecting research vials after the FDA advisory panel vote means applying proper reconstitution, cold storage, and purity practices to keep peptide materials stable at the bench.... Read more...
How the FDA's peptide review could change how you source research compounds
How the FDA's peptide review could change how you source research compounds

About the FDA review The FDA is conducting a review of how certain research peptides are regulated, which could affect how laboratories and compounding pharmacies source these materials. The review... Read more...
How compounding reshapes your peptide stability
How compounding reshapes your peptide stability

What compounding is Compounding is the small-batch preparation of peptides, where each lot can differ in purity, buffer composition, and preservative content compared to standard commercial manufacturing. This batch-to-batch variability... Read more...
How Batch Transparency Saves Your Peptide Vials
How Batch Transparency Saves Your Peptide Vials

What Batch Transparency Means Batch-level transparency is the practice of linking each research peptide vial to lot-specific analytical data, such as HPLC and mass spectrometry test reports. It allows researchers... Read more...
How AI predicts peptide stability before your vials arrive
How AI predicts peptide stability before your vials arrive

What it is AI-based peptide stability prediction is a computational screening method in which machine learning models trained on known peptide properties evaluate millions of candidate sequences and rank them... Read more...
GLP-1's Other Benefit: Fewer Sick Days for Researchers?
GLP-1's Other Benefit: Fewer Sick Days for Researchers?

What the Study Found A JAMA-published study reported that employees prescribed GLP-1 receptor agonists had 18% lower odds of taking long-term sick leave, with the reduction persisting after controlling for... Read more...
FDA Panel Backs Peptides Your Freezer Might Be Killing
FDA Panel Backs Peptides Your Freezer Might Be Killing

The Panel Vote An FDA advisory panel narrowly voted to recommend approving certain compounded peptide drugs, a decision that turns on whether compounding can reliably produce a pure and consistent... Read more...
FDA just changed compounding rules: what researchers need
FDA just changed compounding rules: what researchers need

Compounding rule update FDA advisory panels have voted to recommend easing certain restrictions on how pharmacies compound peptides for research use, shifting select compounded peptides into a less restricted regulatory... Read more...
FDA is reviewing 7 peptides. Here's what changes at your bench
FDA is reviewing 7 peptides. Here's what changes at your bench

The PCAC review The FDA's Pharmacy Compounding Advisory Committee (PCAC) reviews specific bulk substances, including peptides, to determine whether compounding pharmacies may legally prepare them. A panel vote against a... Read more...
FDA backed unapproved peptides but raised purity red flags
FDA backed unapproved peptides but raised purity red flags

What it is The FDA advisory panel vote refers to a recommendation supporting continued research access to certain unapproved peptides, while flagging manufacturing consistency, purity, and potency as the panel's... Read more...
What the FDA peptide compounding panel means for your vials
What the FDA peptide compounding panel means for your vials

The PCAC panel The FDA's Pharmacy Compounding Advisory Committee (PCAC) is the federal panel that advises the agency on which bulk drug substances compounding pharmacies may legally use when preparing... Read more...
What an FDA panel just did to six unproven peptides
What an FDA panel just did to six unproven peptides

What it is The article covers an FDA advisory panel vote to keep six unproven peptide substances accessible rather than restrict them, without approving them for any indication. It examines... Read more...
What GLP-1 Research Just Quietly Changed For Your Bench
What GLP-1 Research Just Quietly Changed For Your Bench

What GLP-1 Is GLP-1 is a 30-amino-acid incretin peptide secreted by intestinal L-cells that binds the GLP-1 receptor, a class B G-protein-coupled receptor expressed on pancreatic cells, hypothalamic and brainstem... Read more...
Why 6 of 7 Peptides Survived the FDA's New Bar
Why 6 of 7 Peptides Survived the FDA's New Bar

What Peptides Are Peptides are short chains of amino acids, typically fewer than 50 residues, that fold into defined structures and bind specific receptors with high affinity. Manufacturing quality—sequence characterization,... Read more...
GLP-1 peptides: what every bench researcher should vet
GLP-1 peptides: what every bench researcher should vet

What GLP-1 Is GLP-1 (glucagon-like peptide-1) is a 30- or 31-amino-acid incretin hormone secreted by intestinal L-cells that binds the GLP-1 receptor. Semaglutide and tirzepatide are synthetic, albumin-binding peptides that... Read more...
What Eli Lilly's GLP-1 lawsuits mean for your peptide supply
What Eli Lilly's GLP-1 lawsuits mean for your peptide supply

What Retatrutide Is Retatrutide is a synthetic acylated peptide built on a triple-agonist scaffold that acts on GLP-1, GIP, and glucagon receptors, distinguishing it from single-target GLP-1 molecules such as... Read more...
What 200 GLP-1 Death Reports Actually Tell Bench Researchers
What 200 GLP-1 Death Reports Actually Tell Bench Researchers

For research and educational reference only. PreppinPeppers sells laboratory hardware and materials (reconstitution pens, cartridges, and bacteriostatic water); it does not sell peptides or any substance for consumption. This is... Read more...
Why your peptide's charge quietly controls its shelf life
Why your peptide's charge quietly controls its shelf life

What charge controls A peptide's net electrical charge, set by its amino acid composition, is the chemical property that determines how quickly it releases from a charged gelatin gel and... Read more...
Why BofA's $250M GLP-1 bill matters for your vials
Why BofA's $250M GLP-1 bill matters for your vials

What $250M signals Bank of America's $250M+ employee benefits bill for GLP-1 drugs is a publicly reported figure that functions as a market signal for demand, manufacturing capacity, and supply... Read more...
What the GLP-1 drug race means for your vial purity checks
What the GLP-1 drug race means for your vial purity checks

What GLP-1 peptides are GLP-1-class peptides are research compounds based on glucagon-like peptide-1, a gut-derived incretin hormone, and the field is expanding from single-target molecules into longer dual and triple... Read more...
What Lilly and Viking's GLP-1 race means for your vials
What Lilly and Viking's GLP-1 race means for your vials

Dual and triple agonists Dual and triple agonist peptides are research molecules that bind two or three receptor targets at once, such as GLP-1 combined with GIP or glucagon receptors.... Read more...
What Your Peptide Vial's Purity Label Actually Guarantees
What Your Peptide Vial's Purity Label Actually Guarantees

What a Purity Label Is A peptide vial's purity label, typically a Certificate of Analysis (COA), reports the analytical purity of the lyophilized powder at the time of manufacture, usually... Read more...
The GLP-1 jobs study and why your vial math still matters
The GLP-1 jobs study and why your vial math still matters

What GLP-1 is GLP-1 (glucagon-like peptide-1) is a natural gut hormone whose engineered analogs, like semaglutide and tirzepatide, persist longer in circulation; a recent economics-dataset claim of a 27% employment... Read more...