Notes from the bench.
How to read a certificate, what a purity figure actually measures, why a peptide lives at 2–8°C, and what the literature does and doesn't say about each compound we supply. Written for people who check.
SS-31 vs MOTS-c: two "mitochondrial peptides" with little in common
You've probably seen SS-31 and MOTS-c filed together as "mitochondrial peptides". One was designed in a lab, the other was found in our own mitochondrial DNA. Here's how they differ in origin, size, chemistry, evidence and status.
27 October 2026 · 7 min
ReadWhat are peptides? A plain-English guide to the word everyone is using
You've probably seen "peptides" everywhere this year, usually with no definition attached. Here's what the word means, where the line with proteins is drawn, how they're made, and what "research peptide" does and doesn't tell you.
27 October 2026 · 7 min
ReadTesting & quality
10 articlesIs retatrutide fake? What independent testing has actually found
Counterfeit retatrutide is the story of 2026. The lab data says something more specific: the usual failure is not the wrong molecule but the wrong amount. What the published testing shows, and the five-minute check it points to.
27 October 2026 · 6 min
ReadHow to get a peptide independently tested in the UK
Independent testing is the only thing that settles an argument about what is in a vial. Here is what it costs, which laboratories take UK samples, why the free routes are American-only, and the shipping problem nobody warns you about.
23 September 2026 · 5 min
ReadIs this Janoshik report real? The fraud patterns, and a five-minute check
Buyers keep finding the same Janoshik report on three different vendors' sites, to the decimal. It is not a coincidence. The four ways a report gets faked, the one way it gets borrowed, and a five-minute routine that catches all of them.
21 September 2026 · 5 min
ReadBatch traceability: how you know the pen in your hand is the one that was tested
The sharpest objection in any peptide thread: they could test one unit and ship you anything. True. The answer is a chain — batch, carton, certificate, report — and knowing which links a vendor cannot forge.
21 September 2026 · 4 min
Read99% pure is not 10 mg: purity, quantity and identity are three different numbers
A pen can be 99.5% pure and hold half the peptide it claims. Purity is what fraction of the material is the right molecule; quantity is how much there is. Most vendor pages quote the first and never the second.
21 September 2026 · 4 min
ReadWhy a blend report has no purity percentage — and what to read instead
Our Glow report has three content figures and no purity percentage, and buyers ask why. Purity is a single-peak ratio and a blend has three peaks. What the report does show, and what a '99% pure blend' claim really means.
21 September 2026 · 5 min
ReadHow to read a peptide certificate of analysis
A CoA is only as good as your ability to read it. The seven fields that matter, the ones that are decoration, and the mismatches that should stop an order.
8 September 2026 · 6 min
ReadHPLC-MS and peptide purity: what the number means
Chromatography measures how much of the sample is the main peak. Mass spectrometry confirms the peak is the right molecule. Why you want both, and what neither can tell you.
8 September 2026 · 5 min
ReadWhat a Janoshik report proves — and the four things it doesn't
The lab every UK vendor cites. What its reports actually measure, how to verify one yourself in thirty seconds, why two labs give two numbers for one batch, and the four things no purity report can tell you.
8 September 2026 · 5 min
ReadResearch-grade vs pharmaceutical-grade: what the words actually mean
Same molecule, different product. What a licensed medicine is tested, certified and monitored for that a research compound is not — and why 'pharmaceutical grade' on a vendor page is a phrase, not a standard.
8 September 2026 · 4 min
ReadBuying guides
8 articlesAre research peptides legal in the UK?
The short answer is yes, for laboratory research, and the permission is narrower than most sites selling them imply. Here is what the law actually says and where the line falls.
23 September 2026 · 4 min
ReadFDA approved, MHRA licensed, or neither?
“Is it FDA approved?” is the most-asked question about every one of these compounds, and for most of them the honest answer is not no — it is that nobody has ever been asked.
23 September 2026 · 6 min
ReadWhich peptides are on the WADA prohibited list?
Anti-doping status is a separate question from legal status, and the answer is usually stricter. Which categories these compounds fall under, and why “is it tested for?” is the wrong thing to ask.
23 September 2026 · 6 min
ReadBuying research peptides in the UK: a ten-point checklist
Legal status, certificates, batch traceability, refrigerated storage, payment — the ten things to check before you order from any UK research-peptide vendor, and the red flags that should end the conversation.
8 September 2026 · 6 min
ReadWill UK customs seize peptides? Importing versus buying domestically
What Border Force actually detains, why a parcel is judged by how it's presented, the one-month clock if something is held, and why stock already in the UK sidesteps the whole question.
8 September 2026 · 4 min
ReadWhy there is no dosing guide on this site
The most-searched questions about every compound we sell are questions we won't answer. Why that's the line, what it tells you about vendors who cross it, and what we will help with.
8 September 2026 · 4 min
ReadWhy peptide vendors don't take cards — and what a safe payment looks like
Card networks class the category as high-risk, so bank transfer and crypto are the norm. What that does to your protection, which method actually leaves you covered, and the payment red flags to walk away from.
8 September 2026 · 4 min
ReadHow much should retatrutide cost in the UK? A price, taken apart
Manufacture, the pen, two rounds of testing, refrigeration, UK stock and a UK company: what a price is made of, why per-milligram is the only fair comparison, and why the cheapest listing is the one to worry about.
8 September 2026 · 6 min
ReadCompounds
26 articlesPT-141, explained: the cyclic peptide also called bremelanotide
PT-141 and bremelanotide are the same molecule: a seven-residue ring-closed peptide that sits one small chemical change away from melanotan II. What it is, which receptors it binds, how its trials were built, and where regulators stand.
27 October 2026 · 6 min
ReadSS-31 vs MOTS-c: two "mitochondrial peptides" with little in common
You've probably seen SS-31 and MOTS-c filed together as "mitochondrial peptides". One was designed in a lab, the other was found in our own mitochondrial DNA. Here's how they differ in origin, size, chemistry, evidence and status.
27 October 2026 · 7 min
ReadWhat are peptides? A plain-English guide to the word everyone is using
You've probably seen "peptides" everywhere this year, usually with no definition attached. Here's what the word means, where the line with proteins is drawn, how they're made, and what "research peptide" does and doesn't tell you.
27 October 2026 · 7 min
ReadSemaglutide tablets vs injections: how a peptide survives being swallowed
Most peptides are destroyed in the gut, yet semaglutide comes as a tablet. The formulation chemistry that makes that possible, why most of it is still never absorbed, and how the two trial programmes were built.
27 October 2026 · 8 min
ReadIs NAD+ a peptide? What the molecule actually is
You've probably seen NAD+ listed next to peptides and assumed it was one. It isn't. Here's what it actually is, why it sits on the same shelves, and how its identity is checked.
27 October 2026 · 5 min
ReadIs GLP-3 the same as retatrutide? What the nickname actually means
You've seen "GLP-3" in headlines and on listings. It almost always means retatrutide, and it's a nickname rather than a scientific name. Here's where it came from, and why it misleads.
29 September 2026 · 3 min
ReadRetatrutide's phase 3 trials, broken down: TRIUMPH and TRANSCEND
"Phase 3 results are in" posts make it sound like one big trial with one answer. The registry lists fourteen. Here's what each one is, in plain English, and why most of the story isn't published yet.
29 September 2026 · 6 min
ReadKlow vs Glow: what is actually in each blend
If you've seen "Klow" all over your feed and wondered how it differs from Glow, the answer fits in one line: it's the same three peptides plus a fourth. Here's the milligram breakdown, and the chemistry the posts skip.
28 September 2026 · 4 min
ReadHow to read a peptide study: BPC-157 and retatrutide, broken down
"A new study shows…" gets millions of views. Five questions tell you what kind of evidence you're actually looking at, and the real BPC-157 and retatrutide papers make perfect worked examples.
28 September 2026 · 7 min
ReadOrforglipron, explained: a GLP-1 receptor agonist that is not a peptide
Every GLP-1 medicine before it was a peptide. Orforglipron is a small synthetic molecule that reaches the same receptor by a different route. What that means chemically, where it is licensed, and why Biovanta does not supply it.
25 September 2026 · 5 min
ReadCagrilintide, explained: the amylin analogue beside the GLP-1s
Cagrilintide gets filed under GLP-1 drugs because it is usually paired with one. It is an analogue of a different hormone, amylin, at a different receptor family. What that means, how it differs from retatrutide, and its status.
25 September 2026 · 5 min
ReadMOTS-c and KPV: two research peptides that fit no family
Most research peptides belong to a family: incretin analogues, GHRH analogues, tissue-repair fragments. MOTS-c and KPV do not. Where each comes from, how big each is, what the literature studies, and what to check on a certificate.
25 September 2026 · 6 min
ReadTirzepatide, explained: one molecule, two receptors
A 39-amino-acid synthetic peptide built on the GIP backbone that activates two receptors rather than one. What the molecule is, why it lasts for days, and what its licensed status means for research supply.
23 September 2026 · 6 min
ReadTesamorelin, explained: asking the pituitary rather than replacing it
A synthetic analogue of human growth hormone-releasing hormone, protected at one end against the enzyme that would otherwise cleave it. What it is, how it differs from giving growth hormone directly, and where it sits in regulation.
23 September 2026 · 5 min
ReadMOTS-c, explained: a peptide written in mitochondrial DNA
A sixteen-amino-acid peptide whose gene sits inside the mitochondrial genome rather than the nucleus. What makes that unusual, what the research covers, and what to check when it is supplied.
23 September 2026 · 7 min
ReadKPV, explained: three amino acids off the end of a hormone
Lysine, proline, valine: the final three residues of alpha-melanocyte-stimulating hormone, studied as a fragment in its own right. Why the parent hormone pigments skin and the fragment does not.
23 September 2026 · 6 min
ReadCJC-1295 with DAC, explained: four swaps and a chemical hook
A 29-residue GHRH fragment carrying four amino acid substitutions, plus a linker that forms a covalent bond with albumin in the bloodstream. What each modification is for, and why the DAC version behaves so differently.
23 September 2026 · 4 min
ReadBPC-157 vs TB-500: two different molecules
They get named in the same breath so often that people assume they are variants of one thing. They are not related, they are not the same size, and they are studied along different mechanisms.
23 September 2026 · 4 min
ReadCJC-1295 with DAC vs without: what the complex changes
Two products, one name, and a suffix that changes the molecule's behaviour by orders of magnitude. The confusion is made worse by the fact that the version without DAC is usually a different peptide entirely.
23 September 2026 · 3 min
ReadCJC-1295 vs tesamorelin: two GHRH analogues
Same receptor, same category on the prohibited list, very different regulatory histories — one has been through an approval process and the other has not been assessed at all.
23 September 2026 · 3 min
ReadWhy most peptides do not survive the gut
The same peptide sold as a capsule, a nasal spray and a solution is not the same proposition three ways. The chemistry of why is straightforward, and it explains most of what the market disagrees about.
23 September 2026 · 5 min
ReadRetatrutide, explained: the triple agonist in the literature
What retatrutide is, which three receptors it targets, where it sits in the trial pipeline, its UK regulatory status, and what to check on a research-grade certificate.
8 September 2026 · 4 min
ReadTirzepatide vs retatrutide: dual and triple agonists, side by side
The two most-searched incretin peptides compared on what can honestly be compared: receptors, chemistry, trial programme, regulatory status and research supply.
8 September 2026 · 4 min
ReadBPC-157 and TB-500: what they are, and why they're studied together
A 15-residue gastric peptide and a fragment of thymosin beta-4. What each one is, the honest state of the research, their regulatory and anti-doping status, and why they're supplied together.
8 September 2026 · 7 min
ReadGHK-Cu: the copper peptide, from 1973 to the research bench
A three-amino-acid peptide bound to a copper ion, first isolated from human plasma in 1973. Its chemistry, the cell and skin-model research, its use in cosmetics, and how it is supplied for research.
8 September 2026 · 6 min
ReadSemaglutide, tirzepatide, retatrutide: one, two and three receptors
The three names that dominate search, compared on what can honestly be compared: which receptors, whose molecule, what's licensed, and what's published. No numbers borrowed across trials.
8 September 2026 · 5 min
ReadHandling & storage
5 articlesStoring peptides before and after reconstitution
A sealed vial of powder and the same vial an hour after water goes in are two different storage problems with two different clocks. Here is what changes, and which of the two questions a pre-filled format never asks you.
23 September 2026 · 4 min
ReadPeptide pen vs syringe: what actually differs
Both put the same solution in the same place. The difference is entirely in how the volume gets measured and how many times the container is opened — which is a manufacturing question, not a chemistry one.
23 September 2026 · 4 min
ReadMy pen arrived warm — is it ruined? Transit temperature for a pre-filled pen
The most-asked question in every peptide forum, answered for the wrong product. Powder shrugs off a warm afternoon; a solution degrades slowly and predictably. What the stability data say, and what to do with yours.
21 September 2026 · 5 min
ReadPeptide storage: 2–8°C, light and freezing
Why 2–8°C, what heat and light do to a peptide, why freezing a solution is worse than a warm afternoon, and how long a pen lasts once it is in use.
8 September 2026 · 5 min
ReadPre-filled pens vs lyophilised vials: what the format changes
Freeze-dried powder in a vial, or solution in a sealed pen. The two formats research peptides are supplied in, what each asks of you, and where each one can go wrong.
8 September 2026 · 4 min
ReadSources, cited.
Every article that makes a factual claim about a compound links to the paper, the regulator or the standard it came from. If we can't cite it, we don't say it.
No outcomes, no advice.
Our products are supplied for laboratory research. The journal describes chemistry, analysis, handling and regulatory status — never what a compound does in a person, and never how anyone should use it.
Dated, and corrected in the open.
Each article carries the day it went live and the day it was last materially changed. When we get something wrong we fix it and say so in the article.
Free tools: lab report checker and price per mg calculator.
Research use only · Biovanta products are supplied for laboratory research and in-vitro study, not for human or veterinary consumption. Nothing in the journal is medical advice. Testing and certificates