Learn · Terminology

Words used on Apothify, explained simply.

A plain language glossary of the terms that show up across the site. Search, filter by topic, or jump to a letter. Every entry is short and written for someone new to peptide research.

83 terms

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503A

Compliance

Means503A is a rule that says when special pharmacies are allowed to mix a custom medicine.

WhySome peptides are on a list the FDA has flagged under this rule.

ExampleBPC 157 was placed on a 503A review list.

A

Acetate salt

Product quality

MeansAcetate salt is another form of a peptide that has a small vinegar like piece stuck to it.

WhySome research needs the acetate form instead of TFA.

ExampleThe label says acetate salt, not TFA salt.

Agonist

General science

MeansAn agonist is a peptide or drug that turns on a receptor.

WhyMany peptides on Apothify work as agonists.

ExampleIpamorelin is an agonist at the ghrelin receptor.

Aliquot

Storage and handling

MeansAn aliquot is one small portion of a mixed sample, saved for a single use later.

WhySplitting into aliquots keeps the rest of the sample from going bad.

ExampleFreeze the extra solution in small aliquots.

Alpha MSH

General science

MeansAlpha MSH is a body signal that helps control skin pigment and other body systems.

WhySome research peptides on the site are short pieces of the alpha MSH chain.

ExampleKPV is a tripeptide from alpha MSH.

Amino acid

Peptide basics

MeansAn amino acid is one of the small parts that link together to make a peptide.

WhyEvery peptide is just a chain of amino acids in a special order.

ExampleA peptide with five amino acids is called a pentapeptide.

Antagonist

General science

MeansAn antagonist is a peptide or drug that blocks a receptor.

WhyBlocking a receptor stops a signal from being sent.

ExamplePentapeptide-3 is studied as an antagonist at a muscle receptor for the signal acetylcholine.

Anxiolytic research

Research use

MeansAnxiolytic research is the study of how a compound changes calmness or stress in lab models.

WhySome peptides on the site are studied this way in cell or animal models.

ExampleSelank is a peptide studied in anxiolytic research.

B

Bacteriostatic water

Storage and handling

MeansBacteriostatic water is clean water with a tiny bit of preservative added so it stays safe to use for a while.

WhyIt is the most common liquid used to reconstitute research peptides.

ExampleUse bacteriostatic water to mix the powder.

Batch

COA terms

MeansA batch is one group of products made at the same time.

WhyA COA usually goes with one batch, not every batch ever made.

ExampleThis COA belongs to batch 1024.

Bioregulator

Peptide basics

MeansA bioregulator is a very short peptide that researchers say can target a specific kind of tissue.

WhySeveral short peptides on the site are called bioregulators.

ExampleEpitalon is a bioregulator studied in cell research.

C

Cart

Shopping and ordering

MeansThe cart is the list of items a shopper plans to buy.

WhyItems wait in the cart until checkout.

ExampleAdd the product to the cart, then go to checkout.

Category 2

Compliance

MeansCategory 2 is a label the FDA puts on a substance to say it should not be mixed by special pharmacies right now.

WhyOn Apothify, Category 2 peptides are shown as encyclopedia entries, not for sale.

ExampleBPC 157 sits in Category 2.

Caution

Finder terms

MeansCaution is a flag that says two peptides act on related pathways and need a closer read before pairing.

WhyIt is between synergy and redundant; not a warning to avoid, just to read more first.

ExampleTwo GLP-1 peptides together get a caution flag.

Chargeback

Shopping and ordering

MeansA chargeback is when a shopper asks their bank to reverse a payment to a seller.

WhyApothify asks shoppers to email support first before filing one.

ExampleFiling a chargeback can hold the money for weeks.

Checkout

Shopping and ordering

MeansCheckout is the step where a shopper enters their address and pays.

WhyOrders only ship after checkout is finished.

ExampleClick checkout to finish the order.

COA

COA terms

MeansA COA is a lab report that shows what is inside a product.

WhyIt helps people check that the product was tested by a lab.

ExampleBefore looking at a product, check the COA.

Cold chain

Storage and handling

MeansCold chain means keeping a product cold the whole way from the factory to the user.

WhySome peptides need cold shipping in summer or to hot places.

ExampleAsk for cold chain shipping if the weather is hot.

Compounding pharmacy

Compliance

MeansA compounding pharmacy is a special pharmacy that mixes a custom version of a medicine for one person.

Why503A rules are the reason some peptides cannot be mixed at a compounding pharmacy.

ExampleA compounding pharmacy cannot use a Category 2 substance.

Cosmetic peptide

Peptide basics

MeansA cosmetic peptide is a short peptide used in skin care research, often for skin look and feel.

WhySome entries on the site are cosmetic peptides like Argireline and Matrixyl.

ExampleArgireline is a cosmetic peptide used in skin research.

Counter ion

Product quality

MeansA counter ion is a tiny charged piece that sticks to the peptide when it is made.

WhyIt adds to the weight, so the bottle has the peptide plus the counter ion.

ExampleTFA is a common counter ion for research peptides.

E

ELEVATED

Compliance

MeansELEVATED on Apothify means a peptide is shown only as a learn page, not as a product.

WhyIt is the label for items that need more compliance review.

ExampleBPC 157 is marked ELEVATED in the library.

Encyclopedia entry

Compliance

MeansAn encyclopedia entry is a learn page with no cart and no price.

WhyApothify lists some peptides this way so the library is complete.

ExampleSemaglutide has an encyclopedia entry on Apothify.

Endotoxin

Lab testing

MeansAn endotoxin is a tiny piece of bacteria that can be left over in a sample.

WhyLow endotoxin is important for some kinds of cell research.

ExampleThe COA lists an endotoxin level in special units.

F

FDA

Compliance

MeansThe FDA is the United States agency that checks food and drugs.

WhyMost research peptides are not approved by the FDA for use on people.

ExampleThe FDA reviews drugs before they are sold as medicine.

Finder

Finder terms

MeansThe finder is a short quiz that picks peptides based on what a visitor is interested in.

WhyIt is the easiest way to start if a visitor does not know which peptide to read first.

ExampleUse the finder if the library feels too big.

Freeze thaw

Storage and handling

MeansA freeze thaw is one round of freezing a sample and then warming it up again.

WhyToo many freeze thaws can break peptides down.

ExampleAliquots stop the sample from going through many freeze thaws.

G

GH axis

General science

MeansThe GH axis is the chain of signals from the brain to the pituitary to the rest of the body that controls growth hormone.

WhyMost growth hormone research peptides act somewhere on this chain.

ExampleGHRH analogs and ghrelin receptor agonists both act on the GH axis.

Ghrelin receptor

General science

MeansThe ghrelin receptor is a spot on a cell that the hormone ghrelin can attach to.

WhySeveral research peptides are studied for how they attach to this same spot.

ExampleIpamorelin is a selective ghrelin receptor agonist.

GHRH

General science

MeansGHRH stands for growth hormone releasing hormone. It is the body's own signal that tells the pituitary to make growth hormone.

WhyMany peptides on the site are called GHRH analogs, which means they copy this signal in research.

ExampleCJC 1295 and Sermorelin are GHRH analogs.

H

Half life

General science

MeansHalf life is the time it takes for half of a peptide to leave the system being studied.

WhyA short half life means the peptide is gone quickly.

ExampleCJC 1295 with DAC has a longer half life than CJC 1295 without DAC.

HPLC

Lab testing

MeansHPLC is a lab test that splits a sample into parts so each one can be measured.

WhyIt is the main way labs measure how pure a peptide is.

ExampleThe COA shows a purity number from HPLC.

I

Identity testing

Lab testing

MeansIdentity testing checks if the sample is really the peptide listed on the label.

WhyIt is the first thing to check on any COA.

ExampleIdentity testing shows that the powder matches the name on the bottle.

IGF-1

General science

MeansIGF-1 stands for insulin like growth factor 1. It is a body signal made in response to growth hormone.

WhySome research peptides are studied for how they change IGF-1 levels in lab models.

ExampleResearchers measure IGF-1 to track growth hormone activity.

In vitro

Research use

MeansIn vitro means a test done in a tube or dish, not in a living body.

WhyMost peptide research starts with in vitro tests.

ExampleThe team ran an in vitro test on the peptide.

In vivo

Research use

MeansIn vivo means a test done in a living animal, not in a tube.

WhyIt is one step closer to real biology than an in vitro test.

ExampleThe paper described an in vivo study in mice.

Incretin

General science

MeansIncretins are gut hormones that help the body handle sugar after a meal.

WhyPeptides like GLP 1, GIP, and glucagon are in the incretin family and are studied in metabolic research.

ExampleThe incretin family is a focus of body composition research.

ISO 17025

Lab testing

MeansISO 17025 is a stamp that means a lab follows a set of strict testing rules.

WhyA lab with this stamp is more trusted than one without it.

ExampleThe testing lab on the COA is ISO 17025 certified.

K

Khavinson series

Peptide basics

MeansThe Khavinson series is a group of very short peptides developed by Russian researcher Vladimir Khavinson, each said to target one kind of tissue.

WhyMany entries on the site like Epitalon, Vilon, and Cortexin come from this series.

ExampleEpitalon is part of the Khavinson series.

L

L1 L2 L3

Finder terms

MeansL1, L2, and L3 are short codes for warning level 1, 2, and 3.

WhyThey appear as small badges on peptide pages and cards.

ExampleAn L3 peptide is shown with a warning badge on the page.

Laboratory use

Research use

MeansLaboratory use means work done by trained people in a lab.

WhyApothify products are sold for laboratory use, not personal use.

ExampleThis vial is for laboratory use only.

Lot

COA terms

MeansA lot is another word for a batch. It is one group of products made together.

WhyIf the lot number on the bottle does not match the COA, ask the seller.

ExampleEach bottle has a lot number on the label.

Lyophilized

Storage and handling

MeansLyophilized means freeze dried into a light powder.

WhyLyophilized peptides last much longer than ones already mixed with water.

ExampleThe vial holds a lyophilized peptide.

M

Mass spectrometry

Lab testing

MeansMass spectrometry is a test that weighs tiny pieces of a sample very carefully.

WhyIt tells the lab if the sample is the right peptide.

ExampleMass spectrometry confirms the peptide on the label is the one in the vial.

Mechanism

General science

MeansMechanism is the simple word for how a peptide does what it does.

WhyEvery peptide page on Apothify has a section called How it works.

ExampleThe mechanism of Ipamorelin is to attach to the ghrelin receptor.

MGF

General science

MeansMGF stands for mechano growth factor. It is a short form of IGF-1 that researchers study in muscle tissue.

WhyMGF is one of the growth factor research peptides in the library.

ExampleMGF is studied in cell models of muscle tissue.

Microbial test

Lab testing

MeansA microbial test checks if a sample has unwanted germs in it.

WhyResearchers want to know that the sample is not full of bacteria.

ExampleThe COA shows that the microbial test passed.

N

Net peptide content

Product quality

MeansNet peptide content is the amount of pure peptide in the bottle, not counting the water and counter ion.

WhyIt is the number to use if a researcher needs an exact amount.

ExampleA 5 mg vial may have 4 mg of net peptide content.

O

Order confirmation

Shopping and ordering

MeansAn order confirmation is the email that says the order was received.

WhyIt has the order number used to look the order up later.

ExampleSave the order confirmation email.

Order number

Shopping and ordering

MeansAn order number is the code that points to one specific order.

WhyUse it to look up tracking, shipping, or to ask support a question.

ExampleOrder numbers look like APO2026 followed by ten letters and numbers.

P

Pathway

General science

MeansA pathway is the chain of steps a cell uses to send a signal.

WhyPeptides often turn one of these chains on or off.

ExampleThe growth hormone pathway starts at the brain.

PCAC

Compliance

MeansPCAC is a group of experts who give the FDA advice about which substances are appropriate to mix in pharmacies.

WhyTheir advice decides which peptides end up on the Category 2 list.

ExamplePCAC reviewed BPC 157 in November 2023.

Peptide

Peptide basics

MeansA peptide is a short chain of small building blocks called amino acids.

WhyMost things sold on Apothify are peptides used for lab research.

ExampleBPC 157 is a peptide that is studied in a lab.

Prescription medicine

Compliance

MeansA prescription medicine is a drug a doctor has to order for a person.

WhySome peptides on Apothify also exist as prescription medicines in other places.

ExampleSemaglutide is sold as a prescription medicine.

Prohibited list

Compliance

MeansThe prohibited list is the official WADA list of things athletes are not allowed to use in sports.

WhyMany research peptides are on it.

ExampleGrowth hormone peptides are on the prohibited list.

Protein

Peptide basics

MeansA protein is a very long chain of amino acids.

WhyPeptides and proteins are made of the same parts, but proteins are longer.

ExampleA chain with more than fifty amino acids is usually called a protein.

Pulsatile

General science

MeansPulsatile means a signal comes in short bursts instead of one steady flow.

WhyGrowth hormone is naturally released in pulsatile bursts.

ExampleResearchers study how peptides change the pulsatile pattern.

Purity

Product quality

MeansPurity means how much of the product is the main ingredient.

WhyHigher purity usually means fewer extra parts are mixed in.

ExampleThe COA lists the purity result.

R

Receptor

Peptide basics

MeansA receptor is a spot on a cell that a peptide can attach to.

WhyWhen a peptide attaches to a receptor, it can send a signal to the cell.

ExampleIpamorelin is studied for how it attaches to the ghrelin receptor.

Reconstitute

Storage and handling

MeansReconstitute means to mix a dry powder with a liquid to make it ready to use.

WhyMost peptides need to be reconstituted before they can be measured into a test.

ExampleAdd the right amount of water to reconstitute the powder.

Redundant

Finder terms

MeansRedundant means two peptides do the same job, so stacking them does not add anything.

WhyThe compare tool flags redundant pairs so visitors do not waste time stacking them.

ExampleTwo GHRH peptides together are flagged redundant.

Reference compound

Research use

MeansA reference compound is a known sample used as a check during research.

WhyResearchers compare new results against the reference compound.

ExampleThe team used a known peptide as the reference compound.

Reference standard

COA terms

MeansA reference standard is a known clean sample the lab uses to compare with the test sample.

WhyIt lets the lab tell if the test sample is the right thing.

ExampleThe lab matched the sample against a reference standard.

Research use only

Research use

MeansResearch use only means a product is sold only for lab work, not for use on people or animals.

WhyEvery product on Apothify is research use only.

ExampleThe label says research use only.

Result

COA terms

MeansA result is the actual number the lab measured for the test.

WhyCompare the result to the specification to see if the batch passes.

ExampleThe HPLC result on this COA was 99.2 percent.

S

SAFE

Compliance

MeansSAFE on Apothify means a peptide passed our checks and is offered as a research product.

WhyIt is the label we use for items you can add to a cart.

ExampleIpamorelin is marked SAFE in the library.

Selectivity

General science

MeansSelectivity means how much a peptide sticks to one receptor instead of many.

WhyMore selective peptides are easier to study because they do fewer things at once.

ExampleIpamorelin has high selectivity for one receptor.

Sequence

Peptide basics

MeansA sequence is the exact order of amino acids in a peptide.

WhyChange the order, and you change what the peptide is.

ExampleTwo peptides can have the same parts but a different sequence.

Shelf life

Product quality

MeansShelf life is how long a product is expected to stay good if it is stored the right way.

WhyOld products may not work as well in research.

ExampleThe shelf life on the COA is 24 months at minus 20 Celsius.

Shipping

Storage and handling

MeansShipping is the part where the package travels from the warehouse to the address on the order.

WhyMost lyophilized peptides are fine at room temperature for the trip.

ExampleShipping takes one to five business days.

Sold out

Shopping and ordering

MeansSold out means the product cannot be ordered right now.

WhyA sold out product is still listed so a shopper can read about it and come back later.

ExampleThe tile shows Sold out.

Specification

COA terms

MeansA specification is the target number a test result is supposed to meet.

WhyIf the result is inside the specification, the batch passes.

ExamplePurity must meet a specification of at least 98 percent.

Stability

Product quality

MeansStability is how well a product stays the same over time.

WhyPeptides break down faster than many other lab supplies.

ExampleCold storage helps with stability.

Stack

Finder terms

MeansA stack is two or more peptides studied together.

WhySome pairs are studied together a lot; some should not be combined.

ExampleCJC 1295 no DAC plus Ipamorelin is a common research stack.

Sterile water

Storage and handling

MeansSterile water is clean water with no preservative.

WhyIt is used for one time mixes that will be used right away.

ExampleSterile water has no benzyl alcohol in it.

Synergy

Finder terms

MeansSynergy means two peptides work better together than either does alone.

WhyThe compare tool flags synergy for pairs that are well studied together.

ExampleGHRH plus GHRP shows a synergy flag.

T

Tag

Finder terms

MeansA tag is a short label that groups peptides by topic.

WhyTags help the finder match peptides to the visitor's interests.

ExampleThe growth hormone tag groups peptides about growth hormone.

TFA salt

Product quality

MeansTFA salt is one common form of a peptide that has a small acid stuck to it.

WhyIt is the cheapest and most common form for research peptides.

ExampleThis peptide ships as a TFA salt.

Third party lab

Lab testing

MeansA third party lab is an outside testing company, not the maker of the product.

WhyOutside testing is more trusted because the lab has no reason to lie.

ExampleThe COA comes from a third party lab.

Tracking number

Shopping and ordering

MeansA tracking number is a code from the shipper that shows where a package is.

WhyIt lets a shopper follow a package from the warehouse to the door.

ExamplePaste the tracking number into the carrier site.

W

WADA

Compliance

MeansWADA is the world group that lists substances banned in sports.

WhyMost peptides on Apothify are on the WADA list and not allowed in sports testing.

ExampleAthletes check WADA before using anything new.

Warning level

Finder terms

MeansWarning level is a 1 to 3 number that shows how careful a researcher needs to be with a peptide.

WhyLevel 1 is the most careful and well studied; level 3 needs more care.

ExampleCarnosine is warning level 1; Semaglutide is warning level 3.

Water content

Product quality

MeansWater content is how much water is left inside the dried powder.

WhySome water is always there, and it changes how much peptide is really in the bottle.

ExampleThe COA shows a water content of about 6 percent.