01
WHAT ARE PEPTIDES?
At the most basic level, peptides are short chains of amino acids linked together by peptide bonds. Your body makes thousands of them naturally — they act as signaling molecules, telling your cells what to do. Think of them as the body’s internal text messages.
THE LANGUAGE ANALOGY
Amino Acids
The letters of the alphabet. There are 20 standard amino acids (like Glycine, Alanine, Leucine). These are the building blocks.
Peptides
The words. Typically 2–50 amino acids strung together in a specific order. Each unique sequence does something different.
Proteins
The sentences and paragraphs. Proteins are 50+ amino acids long and form complex 3D structures that carry out major biological functions.
WHY DO PEPTIDES MATTER FOR RESEARCH?
Because peptides are highly specific. Unlike broad-acting drugs, a peptide targets a particular receptor or pathway. This specificity is why researchers are interested in them — they can study precise biological mechanisms with fewer off-target effects. Many peptides occur naturally in the body (like GLP-1, which regulates blood sugar), making them especially relevant to biomedical research.
HOW PEPTIDES DIFFER FROM OTHER COMPOUNDS
| Compound Type | What It Is | How It Works | Key Difference |
|---|---|---|---|
| Peptides | Short amino acid chains | Bind to specific receptors; signal cells naturally | Mimics the body’s own signaling; breaks down into amino acids |
| Steroids (AAS) | Synthetic hormones (testosterone-derived) | Bind to androgen receptors; alter gene expression | Much broader systemic effects; suppresses natural hormone production |
| SARMs | Selective androgen receptor modulators | Target muscle/bone androgen receptors | Synthetic chemicals, not amino-acid-based; still suppressive |
| Small Molecule Drugs | Traditional pharmaceutical compounds | Various mechanisms (enzyme inhibition, etc.) | Can cross cell membranes; peptides generally cannot (they signal from outside) |
KEY TAKEAWAY
Peptides are short amino acid chains that act as the body’s natural signaling molecules. They are more targeted and specific than steroids or SARMs, and they break down naturally into amino acids. This is why they are a growing area of research interest.
02
PEPTIDE CATEGORIES EXPLAINED
Peptides are grouped by what they do in the body, not what they’re made of. Here are the major categories you’ll encounter in research. Each card shows the key peptides, how the category works, and who typically studies them.
TISSUE REPAIR
BPC-157
TB-500
GHK-Cu
These peptides support the body’s natural healing processes. BPC-157 (Body Protection Compound) is derived from a stomach protein and researched for gut, tendon, and ligament repair. TB-500 (Thymosin Beta-4 fragment) promotes cell migration to injury sites. GHK-Cu is a copper peptide studied for wound healing and collagen remodeling.
Researched by: Sports medicine, orthopedics, gastroenterology labs
Researched by: Sports medicine, orthopedics, gastroenterology labs
GH AXIS (GROWTH HORMONE)
Ipamorelin
CJC-1295
Sermorelin
Tesamorelin
These peptides stimulate your pituitary gland to release its own growth hormone — they are called growth hormone secretagogues (GHS). Unlike synthetic HGH (which replaces your GH), these encourage your body to produce more naturally. Ipamorelin is a ghrelin mimetic (GHRP). CJC-1295 is a GHRH analog. They are often combined for synergistic pulse release. Tesamorelin is FDA-approved for lipodystrophy.
Researched by: Endocrinology, anti-aging medicine, sports science
Researched by: Endocrinology, anti-aging medicine, sports science
COGNITIVE / NOOTROPIC
Semax
Selank
Dihexa
Peptides studied for brain function, memory, and neuroprotection. Semax is a synthetic ACTH fragment used in Russia for cognitive enhancement and stroke recovery; it increases BDNF (brain-derived neurotrophic factor). Selank is a tuftsin analog studied for anti-anxiety effects. Dihexa is an extremely potent angiotensin IV analog researched for memory and neurodegenerative conditions.
Researched by: Neuroscience, neuropsychiatry, cognitive science
Researched by: Neuroscience, neuropsychiatry, cognitive science
LONGEVITY / ANTI-AGING
Epithalon
MOTS-c
SS-31
NAD+
These target fundamental aging mechanisms. Epithalon (Epitalon) activates telomerase, the enzyme that maintains telomere length — essentially the “caps” on your chromosomes that shorten with age. MOTS-c is a mitochondrial-derived peptide that improves cellular energy metabolism. SS-31 (Elamipretide) targets the inner mitochondrial membrane to reduce oxidative stress. NAD+ precursors support cellular energy production.
Researched by: Gerontology, mitochondrial biology, longevity science
Researched by: Gerontology, mitochondrial biology, longevity science
IMMUNE MODULATION
Thymosin Alpha-1
LL-37
These peptides modulate immune function. Thymosin Alpha-1 (Ta1) is naturally produced by the thymus gland and enhances T-cell function. It is approved in over 35 countries for hepatitis B/C and as an immune adjuvant. LL-37 is a cathelicidin — an antimicrobial peptide produced by your immune cells. It directly kills bacteria and modulates inflammation. Researched for infections, wound healing, and immune support.
Researched by: Immunology, infectious disease, oncology support
Researched by: Immunology, infectious disease, oncology support
HORMONAL / REPRODUCTIVE
HCG
Gonadorelin
Kisspeptin
These peptides interact with the hypothalamic-pituitary-gonadal (HPG) axis. HCG (Human Chorionic Gonadotropin) mimics LH and stimulates testosterone production; commonly used during TRT to maintain fertility. Gonadorelin is a synthetic GnRH that triggers LH and FSH release. Kisspeptin sits upstream of GnRH and is studied for its role in puberty, fertility, and hormonal regulation.
Researched by: Reproductive endocrinology, fertility medicine, urology
Researched by: Reproductive endocrinology, fertility medicine, urology
COSMETIC / SKIN
SNAP-8
GHK-Cu
Copper Peptides
Peptides researched for skin rejuvenation. SNAP-8 (Acetyl Octapeptide-3) is studied as a topical “Botox alternative” — it inhibits the SNARE complex involved in muscle contraction, potentially reducing wrinkle depth. GHK-Cu (also in the tissue repair category) promotes collagen synthesis and skin remodeling. These peptides are commonly found in high-end skincare serums and are researched for topical delivery.
Researched by: Dermatology, cosmetic science, wound care
Researched by: Dermatology, cosmetic science, wound care
KEY TAKEAWAY
Peptides span a huge range of biological functions — from tissue repair and metabolism to brain health and immunity. They are categorized by their target system, not their structure. Understanding which category a peptide falls into tells you a lot about what it does and why researchers study it.
03
HOW RECONSTITUTION WORKS
Peptides are shipped as freeze-dried (lyophilized) powder because they are fragile molecules that degrade in liquid form. Before use, you must reconstitute them — meaning dissolve the powder in a specific solvent. This is simpler than it sounds.
1
UNDERSTAND WHAT'S IN THE VIAL
When you receive a peptide vial, it contains a small amount of lyophilized (freeze-dried) powder — usually a white or off-white cake or puck at the bottom. This is pure peptide, stripped of all moisture through a process called lyophilization. It is stable in this form for months when stored properly.
The vial label tells you how many milligrams (mg) of peptide are inside — commonly 5mg or 10mg. This number is crucial for calculating your concentration later.
The vial label tells you how many milligrams (mg) of peptide are inside — commonly 5mg or 10mg. This number is crucial for calculating your concentration later.
2
CHOOSE YOUR SOLVENT
Bacteriostatic Water (BAW) is the standard solvent for reconstitution. It is sterile water with 0.9% benzyl alcohol added as a preservative. This preservative is critical — it prevents bacterial growth, allowing the reconstituted peptide to last up to 28 days refrigerated.
Sterile Water (without preservative) can also be used, but the reconstituted solution must be used within 24–48 hours because there is nothing preventing bacterial growth.
Rule of thumb: Always use BAW unless there is a specific reason not to (e.g., allergy to benzyl alcohol).
Sterile Water (without preservative) can also be used, but the reconstituted solution must be used within 24–48 hours because there is nothing preventing bacterial growth.
Rule of thumb: Always use BAW unless there is a specific reason not to (e.g., allergy to benzyl alcohol).
PREFERRED
Lasts ~28 days
vs
ALTERNATE
Use within 48hrs
3
ADD SOLVENT TO THE VIAL
This is the most important step to get right:
1. Clean the vial stopper and BAW vial top with an alcohol swab.
2. Draw your desired amount of BAW into a syringe (see Step 4 for how much).
3. Insert the needle into the peptide vial at an angle.
4. Slowly release the water down the inside wall of the vial. Do NOT spray it directly onto the powder — this can damage the peptide.
5. Once added, gently swirl the vial. Never shake it. Shaking can denature (destroy) the peptide’s structure.
6. Let it sit for a few minutes. The powder should dissolve into a clear solution. If it’s cloudy, give it more time with gentle swirling.
1. Clean the vial stopper and BAW vial top with an alcohol swab.
2. Draw your desired amount of BAW into a syringe (see Step 4 for how much).
3. Insert the needle into the peptide vial at an angle.
4. Slowly release the water down the inside wall of the vial. Do NOT spray it directly onto the powder — this can damage the peptide.
5. Once added, gently swirl the vial. Never shake it. Shaking can denature (destroy) the peptide’s structure.
6. Let it sit for a few minutes. The powder should dissolve into a clear solution. If it’s cloudy, give it more time with gentle swirling.
4
CALCULATE YOUR CONCENTRATION
The concentration depends on how much solvent you add. This is your choice and determines how easy the peptide is to dose accurately.
Formula:
Concentration = Peptide Amount ÷ Solvent Volume
Example 1: 10mg peptide + 2mL BAW = 5 mg/mL
Example 2: 5mg peptide + 2mL BAW = 2.5 mg/mL
Example 3: 10mg peptide + 3mL BAW = 3.33 mg/mL
Common practice: Adding 2mL to a 10mg vial gives 5 mg/mL — easy math and accurate dosing.
Concentration = Peptide Amount ÷ Solvent Volume
Example 1: 10mg peptide + 2mL BAW = 5 mg/mL
Example 2: 5mg peptide + 2mL BAW = 2.5 mg/mL
Example 3: 10mg peptide + 3mL BAW = 3.33 mg/mL
Common practice: Adding 2mL to a 10mg vial gives 5 mg/mL — easy math and accurate dosing.
Why does this matter? Because when you draw your dose with a syringe, you need to know how many mcg are in each unit mark. A higher concentration means smaller volume per dose (more precise), but too concentrated can mean tiny volumes that are hard to measure.
5
DRAW THE CORRECT DOSE
Now convert your desired dose (in mcg) to syringe units:
Step 1: Convert mg/mL to mcg per unit
mcg per unit = (concentration in mg/mL × 1000) ÷ 100
Example: 5 mg/mL concentration
(5 × 1000) ÷ 100 = 50 mcg per unit
Step 2: Calculate units to draw
Units = desired dose (mcg) ÷ mcg per unit
Want 250 mcg? 250 ÷ 50 = 5 units on syringe
Want 500 mcg? 500 ÷ 50 = 10 units on syringe
Want 200 mcg? 200 ÷ 50 = 4 units on syringe
mcg per unit = (concentration in mg/mL × 1000) ÷ 100
Example: 5 mg/mL concentration
(5 × 1000) ÷ 100 = 50 mcg per unit
Step 2: Calculate units to draw
Units = desired dose (mcg) ÷ mcg per unit
Want 250 mcg? 250 ÷ 50 = 5 units on syringe
Want 500 mcg? 500 ÷ 50 = 10 units on syringe
Want 200 mcg? 200 ÷ 50 = 4 units on syringe
6
STORAGE AFTER RECONSTITUTION
Once reconstituted, the clock is ticking:
With BAW: Store in the refrigerator (36–46°F / 2–8°C). Good for up to 28 days. Keep the vial upright, away from light.
With Sterile Water: Refrigerate and use within 48 hours.
Never freeze reconstituted peptides. Freezing forms ice crystals that can physically destroy the peptide’s structure. Only freeze the unreconstituted powder for long-term storage.
Pro tip: Write the reconstitution date on the vial with a marker so you always know how old it is.
With BAW: Store in the refrigerator (36–46°F / 2–8°C). Good for up to 28 days. Keep the vial upright, away from light.
With Sterile Water: Refrigerate and use within 48 hours.
Never freeze reconstituted peptides. Freezing forms ice crystals that can physically destroy the peptide’s structure. Only freeze the unreconstituted powder for long-term storage.
Pro tip: Write the reconstitution date on the vial with a marker so you always know how old it is.
KEY TAKEAWAY
Reconstitution is just dissolving freeze-dried powder in bacteriostatic water. The three critical rules: (1) add water slowly down the vial wall, (2) never shake — gently swirl, and (3) refrigerate immediately after and use within 28 days. Calculate your concentration before drawing doses so you know exactly what you are measuring.
04
READING AN INSULIN SYRINGE
Insulin syringes are the standard tool for measuring and administering peptides. Understanding the markings is essential for accurate dosing.
THE FUNDAMENTAL RELATIONSHIP
UNITS, MILLILITERS, AND YOU
100 Units
= 1 mL (one milliliter). This is the total capacity of a standard U-100 insulin syringe.
10 Units
= 0.1 mL. Each major tick mark on the syringe represents 10 units.
1 Unit
= 0.01 mL. Each small tick mark. This is your smallest measurable increment.
WORKED EXAMPLE
Scenario:
You have a 10mg vial reconstituted with 6mL BAW
Concentration = 10mg ÷ 6mL = 1.67 mg/mL
You need 200 mcg (0.2mg):
Volume needed = 0.2mg ÷ 1.67 mg/mL = 0.12 mL
0.12 mL × 100 units/mL = 12 units on the syringe
Draw to the 12-unit mark.
You have a 10mg vial reconstituted with 6mL BAW
Concentration = 10mg ÷ 6mL = 1.67 mg/mL
You need 200 mcg (0.2mg):
Volume needed = 0.2mg ÷ 1.67 mg/mL = 0.12 mL
0.12 mL × 100 units/mL = 12 units on the syringe
Draw to the 12-unit mark.
Tips for accurate drawing:
- Pull back slightly past your target mark, then push forward to it. This eliminates air bubbles.
- Hold the syringe at eye level to read the marking accurately. Read from the flat bottom of the meniscus (the curved liquid surface).
- Tap out air bubbles by flicking the syringe barrel with your finger, then push them out before measuring.
- Use a fresh needle for drawing (18G) and a separate one for injection (27-31G). Drawing dulls the needle.
KEY TAKEAWAY
An insulin syringe has 100 units = 1 mL. To figure out how many units to draw, divide your dose (in mg) by your concentration (in mg/mL), then multiply by 100. Always double-check your math before drawing. When in doubt, use a reconstitution calculator.
05
SAFETY & STORAGE
STORAGE TEMPERATURES
Proper storage is the difference between an effective peptide and an expensive vial of degraded amino acids.
-20°C
FREEZER (UNRECONSTITUTED)
Lyophilized powder can be frozen for years. Best for long-term storage of un-opened vials. Avoid repeated freeze-thaw cycles.
2–8°C
REFRIGERATOR (RECONSTITUTED)
Standard fridge temperature. Store all reconstituted peptides here. Stable for up to 28 days with BAW.
15–25°C
ROOM TEMP (SHORT-TERM)
Unreconstituted powder is okay at room temp for a few weeks during shipping. Get it into the fridge or freezer ASAP.
HOW LONG RECONSTITUTED PEPTIDES LAST
| Solvent Used | Storage | Usable For |
|---|---|---|
| Bacteriostatic Water | Refrigerated (2–8°C) | Up to 28 days |
| Sterile Water | Refrigerated (2–8°C) | 24–48 hours |
| Any | Room temperature | Not recommended — degrade rapidly |
| Any | Frozen | Never freeze reconstituted peptides |
SIGNS OF DEGRADATION
- Cloudiness or particles — A properly reconstituted peptide should be clear and colorless. Any cloudiness, floating particles, or film indicates contamination or degradation. Discard immediately.
- Color change — If the solution turns yellow, brown, or any color other than clear, the peptide has degraded. Do not use.
- Unusual smell — Peptide solutions should be virtually odorless. A foul or unusual smell indicates bacterial contamination.
- Reduced effectiveness — If a peptide that was previously effective seems to stop working, the most likely cause is degradation from improper storage or age.
- Powder won’t dissolve — If the lyophilized powder won’t dissolve after gentle swirling for several minutes, it may have been heat-damaged during shipping.
INJECTION SAFETY
- Always use a new, sterile syringe for each injection. Reusing syringes introduces bacteria and dulls the needle, causing tissue damage.
- Never share needles or syringes — this is a serious infection risk (HIV, Hepatitis B/C, bacterial infections).
- Clean the injection site with an alcohol swab and let it dry before injecting.
- Rotate injection sites to prevent lipodystrophy (tissue changes from repeated injections in the same spot).
- Dispose of sharps properly in a designated sharps container (available at any pharmacy). Never throw loose needles in regular trash.
IMPORTANT DISCLAIMER
This content is for educational and research purposes only. It does not constitute medical advice, diagnosis, or treatment recommendations. Peptides discussed here are research compounds. Always consult with a qualified healthcare provider before making any decisions about your health. The information presented reflects current research understanding and may change as new studies emerge.
KEY TAKEAWAY
Store unreconstituted peptides in the freezer for long-term, refrigerator for short-term. Once mixed with BAW, refrigerate and use within 28 days. Discard anything cloudy, discolored, or past its date. Always use fresh syringes and dispose of sharps properly.
06
COMMON ACRONYMS & TERMS
The peptide research world is full of abbreviations. Here is every term you are likely to encounter, explained in plain language.
MEASUREMENT & DOSING
mcg
Microgram — 1/1000th of a milligram. Most peptide doses are measured in mcg. (Also written as μg.)
mg
Milligram — 1/1000th of a gram. Vials are labeled in mg (e.g., 5mg, 10mg).
mL
Milliliter — A unit of volume. 1 mL = 100 units on an insulin syringe. Also equal to 1 cc.
IU
International Unit — A standardized measure of biological activity, not weight. Used for HGH, HCG, and some vitamins. 1 IU of HGH ≠ 1 IU of HCG.
cc
Cubic Centimeter — Identical to 1 mL. Older notation, still used interchangeably.
U-100
100-unit syringe — The standard insulin syringe. 100 units = 1 mL total capacity.
ROUTES OF ADMINISTRATION
SQ / SubQ
Subcutaneous — Injected into the fat layer beneath the skin. Most common route for peptides. Usually the belly or thigh.
IM
Intramuscular — Injected into muscle tissue. Used for some peptides and hormones. Requires a longer needle.
IV
Intravenous — Directly into a vein. Rarely used for peptides outside clinical settings.
IN
Intranasal — Sprayed into the nose. Used for some nootropic peptides (Semax, Selank) for faster brain access.
Topical
Applied to the skin — Used for cosmetic peptides (GHK-Cu, SNAP-8) in creams and serums.
PO / Oral
By mouth — Rare for peptides since stomach acid destroys most. Semaglutide (Rybelsus) is a notable exception.
SCIENCE & QUALITY
MW
Molecular Weight — The mass of one molecule, measured in Daltons. Tells you the size/complexity of the peptide.
Da / kDa
Dalton / Kilodalton — Units of molecular weight. 1 kDa = 1000 Da. Most peptides are 0.5–5 kDa.
HPLC
High-Performance Liquid Chromatography — A lab test that measures peptide purity. Look for ≥98% on a COA.
MS
Mass Spectrometry — Confirms the peptide’s identity by measuring its molecular weight. Used alongside HPLC.
COA
Certificate of Analysis — A lab report showing purity, identity, and sometimes endotoxin levels. Always request one from your supplier.
Lyophilized
Freeze-dried — Water removed by freezing then vacuum sublimation. This is how peptides are stored for stability.
PREPARATION TERMS
BAW
Bacteriostatic Water — Sterile water + 0.9% benzyl alcohol preservative. Standard reconstitution solvent.
Reconstitute
To dissolve — Adding solvent to lyophilized powder to create an injectable solution.
Aliquot
A measured portion — Dividing a reconstituted solution into smaller pre-measured doses.
Mannitol
A sugar filler — Sometimes added to peptide vials as a bulking agent and cryoprotectant during lyophilization.
BIOLOGICAL TERMS
GHS
Growth Hormone Secretagogue — Any compound that stimulates your pituitary to release growth hormone.
GHRH
Growth Hormone Releasing Hormone — The natural hormone that tells your pituitary to make GH. CJC-1295 mimics this.
GHRP
Growth Hormone Releasing Peptide — Mimics ghrelin to trigger GH release via a different pathway than GHRH. Ipamorelin is a GHRP.
GLP-1
Glucagon-Like Peptide-1 — An incretin hormone that regulates blood sugar and appetite. Semaglutide mimics it.
BDNF
Brain-Derived Neurotrophic Factor — A protein that supports neuron growth and survival. Semax increases it.
Half-life
Time for 50% elimination — How long until half the peptide has been cleared from your body. Determines dosing frequency.
Bioavailability
Absorption rate — The percentage of administered peptide that reaches systemic circulation. SQ is typically 70–100%.
Denature
To destroy structure — When a peptide loses its 3D shape (from heat, shaking, etc.) and becomes inactive.
KEY TAKEAWAY
You do not need to memorize all of these at once. Bookmark this page and come back whenever you encounter an unfamiliar term. The most important ones to know early on are: mcg (microgram), BAW (bacteriostatic water), SQ (subcutaneous), COA (certificate of analysis), and lyophilized (freeze-dried).