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Peptide HandlingReference Guide

Handling, reconstitution, and storage protocols for 50 research peptides — compiled from published literature and third-party COA data.

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For Research Reference Only

This information is compiled from publicly available literature. Always consult manufacturer COAs and storage documentation for your specific lot. Stability times are approximations and can vary by manufacturer, purity, and storage conditions.

The Golden Rules of Peptide Handling

The No-Shake Rule

Mechanical Stress

Never

Never shake a peptide vial. Shaking creates foam and denatures the protein chains.

Swirl gently in a circular motion or roll the vial between your palms until dissolved.

Temperature Equilibration

Thermal Shock Prevention

Never

Never reconstitute a vial directly from the freezer. Rapid temperature change damages the lyophilized structure.

Let the sealed lyophilized vial sit at room temperature for 15-30 minutes before adding bacteriostatic water.

The Reconstitution Stream

Solvent Introduction

Never

Never spray bacteriostatic water directly onto the powder cake. Direct impact fragments the peptide.

Aim the syringe needle at the inside glass wall so the water dribbles down gently onto the powder.

Freeze-Thaw Cycles

Storage Discipline

Never

Never repeatedly freeze and thaw a reconstituted vial. Each cycle degrades potency by 5-15%.

Aliquot reconstituted peptide into single-use portions before freezing. Thaw only what you need.

Additional Storage Tips

UV / Light Sensitivity

Use amber vials or wrap in foil for GHK-Cu, Oxytocin, LL-37, Melanotan II, and IGF-1 variants. Light exposure accelerates degradation.

Temperature Ranges

Lyophilized powder: -20°C / -4°F (freezer). Reconstituted solution: 2-8°C / 36-46°F (refrigerator). Never store reconstituted peptides at room temperature long-term.

Bacteriostatic Water

Always use bacteriostatic water (0.9% benzyl alcohol) for reconstitution. Sterile water lacks the preservative and shortens usable life significantly.

How to Read a Certificate of Analysis (COA)

Every reputable vendor has a COA available with each batch. Here are the five fields to check before using any peptide:

Purity (HPLC)

Look for 98% or higher. Lower purity means more impurities that could affect results.

Mass Spectrometry (MS)

Confirms the molecular weight matches the target peptide. A mismatch means wrong compound.

Endotoxin Testing

Should read "below detectable limits" or < 0.5 EU/mg. High endotoxin causes inflammation.

Batch / Lot Number

Must match the number printed on your vial label. A mismatch means the COA is for a different batch.

Testing Date

Should be recent relative to the manufacture date. Old test results may not reflect current purity.

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Peptide Terminology Glossary

The dry powder form peptides ship in. Water is removed under vacuum at low temperature, leaving a stable cake or powder that can be stored long-term without refrigeration.

Sterile water containing 0.9% benzyl alcohol as a preservative. It inhibits bacterial growth, making reconstituted peptides safe to use over multiple days.

The process of adding bacteriostatic water to lyophilized peptide powder to create a prepared research solution. Water should be directed down the vial wall, never sprayed directly onto the powder.

A measured portion of reconstituted peptide transferred into a separate container. Aliquoting avoids repeated freeze-thaw cycles that degrade the main vial.

The time it takes for half of a peptide to degrade or clear from a biological system. Shorter half-lives require more frequent application intervals; longer half-lives allow less frequent preparation cycles.

A document from the manufacturer or a third-party lab verifying a peptide batch's identity, purity, and safety. It typically includes HPLC purity, mass spec data, and endotoxin results.

The standard analytical method for measuring peptide purity. It separates the target peptide from impurities and reports purity as a percentage — 98%+ is considered high quality.

An analytical technique that combines HPLC separation with mass spectrometry identification. It is considered the gold standard for confirming peptide identity and detecting trace impurities that HPLC alone may miss.

Bacterial cell-wall fragments (lipopolysaccharides) that can contaminate peptide preparations during synthesis. Measured in endotoxin units per milligram (EU/mg) via LAL or kinetic chromogenic testing; high endotoxin levels can cause significant inflammatory responses in research models.

The standard analytical method for detecting and quantifying endotoxin contamination in peptide samples. It uses a clotting reaction from horseshoe crab blood cells that is highly sensitive to bacterial endotoxins.

The international standard for testing and calibration laboratories. A lab holding ISO 17025 accreditation has been independently assessed for analytical competence, equipment calibration, and quality management systems — indicating its test results meet a recognized global benchmark.

Good Manufacturing Practice (GMP) and current Good Manufacturing Practice (cGMP) are manufacturing standards that govern facility hygiene, equipment maintenance, batch documentation, and quality control procedures. A cGMP-compliant synthesis process provides greater assurance of consistent purity and safety across production batches.

Chromatographic purity measures the percentage of the peptide peak relative to all other peaks on the HPLC chromatogram. Net peptide content measures the actual mass of peptide per vial after subtracting water, salts, and counter-ions. A vial can show 99% chromatographic purity while containing only 80% net peptide by mass — meaning 20% of the vial weight is non-peptide material.

Peptides are typically synthesized as trifluoroacetate (TFA) salts and may be ion-exchanged to acetate form before shipping. The salt form affects mass calculations and shelf stability; TFA counter-ions contribute to vial weight and can affect net peptide content calculations, while acetate salts are generally considered more compatible with biological research applications.

The chemical bond linking amino acids together in a chain. Peptides are short chains (typically 2-50 amino acids) while proteins are longer. This bond is what shaking, heat, and UV light can break.

Concentration Math Reference

Vial Size	Reconstitution Water	Concentration
2 mg	1 mL	2,000 mcg/mL
5 mg	2 mL	2,500 mcg/mL
10 mg	2 mL	5,000 mcg/mL
15 mg	3 mL	5,000 mcg/mL

Reference table for calculating analytical concentration from vial mass and reconstitution volume.

Peptide Reference Database

Reconstituted Liquid (4°C / 39°F)Lyophilized Powder (-20°C / -4°F)

#	Peptide	Category	Half-Life	Stability	Handling Risk
1	Tirzepatide	Metabolic	5 Days	4 Weeks at 4°C / 39°F	Low
2	Semaglutide	Metabolic	7 Days	4 Weeks at 4°C / 39°F	Low
3	Retatrutide	Metabolic	6 Days	3 Weeks at 4°C / 39°F	Medium Limited stability data; store carefully
4	AOD-9604	Metabolic	30 Min	3 Weeks at 4°C / 39°F	Medium Short half-life; time injections accordingly
5	Liraglutide	Metabolic	13 Hours	4 Weeks at 4°C / 39°F	Low
6	Cagrilintide	Metabolic	8 Days	4 Weeks at 4°C / 39°F	Low
7	Tesofensine	Metabolic	8 Days	N/A (Capsule)	Low Oral capsule -- no reconstitution needed
8	Amlexanox	Metabolic	3 Hours	3 Weeks at 4°C / 39°F	Medium
9	HGH Frag 176-191	Metabolic	30 Min	3 Weeks at 4°C / 39°F	Medium Short half-life; use promptly after reconstitution
10	Frag 176-191	Metabolic	30 Min	3 Weeks at 4°C / 39°F	Medium Identical to HGH Frag; short half-life
11	Ipamorelin	GH Secretagogue	2 Hours	4 Weeks at 4°C / 39°F	Low
12	CJC-1295 (No DAC)	GH Secretagogue	30 Min	3 Weeks at 4°C / 39°F	Medium Short half-life without DAC; time doses carefully
13	CJC-1295 + DAC	GH Secretagogue	8 Days	4 Weeks at 4°C / 39°F	Low
14	Sermorelin	GH Secretagogue	12 Min	3 Weeks at 4°C / 39°F	Medium Very short half-life; inject immediately after reconstitution
15	Tesamorelin	GH Secretagogue	26 Min	3 Weeks at 4°C / 39°F	Medium
16	GHRP-2	GH Secretagogue	25 Min	3 Weeks at 4°C / 39°F	Low
17	GHRP-6	GH Secretagogue	20 Min	3 Weeks at 4°C / 39°F	Low
18	Hexarelin	GH Secretagogue	70 Min	3 Weeks at 4°C / 39°F	Low
19	BPC-157	Healing	4 Hours	4 Weeks at 4°C / 39°F	Low
20	TB-500	Healing	2 Hours	4 Weeks at 4°C / 39°F	Low
21	KPV	Healing	30 Min	3 Weeks at 4°C / 39°F	Medium Anti-inflammatory tripeptide; handle gently
22	LL-37	Healing	4 Hours	2 Weeks at 4°C / 39°F	High Light sensitive; use amber vials. Degrades quickly once reconstituted
23	Selank	Nootropic	3 Min	2 Weeks at 4°C / 39°F	Medium Extremely short half-life; nasal spray preferred
24	Semax	Nootropic	3 Min	2 Weeks at 4°C / 39°F	Medium Extremely short half-life; nasal spray preferred
25	Dihexa	Nootropic	12 Hours	3 Weeks at 4°C / 39°F	High Very potent; handle with care. Research compound
26	PE-22-28	Nootropic	6 Hours	3 Weeks at 4°C / 39°F	Medium
27	Cerebrolysin	Other	60 Min	< 1 Hour at 4°C / 39°F	Critical No lyophilized form; use immediately after opening Note: Cerebrolysin is a porcine brain-derived peptide mix, classified as a prescription drug in many countries.
28	Pinealon	Nootropic	2 Hours	3 Weeks at 4°C / 39°F	Low Short peptide; relatively stable
29	Melanotan II	Cosmetic	1 Hour	4 Weeks at 4°C / 39°F	Medium Light sensitive; store in dark
30	PT-141	Cosmetic	2 Hours	4 Weeks at 4°C / 39°F	Low
31	GHK-Cu	Cosmetic	12 Min	2 Weeks at 4°C / 39°F	High Light sensitive; use amber vials. Contains copper -- do not mix with other peptides
32	Kisspeptin-10	Hormonal	4 Min	2 Weeks at 4°C / 39°F	High Extremely short half-life; inject immediately
33	Oxytocin	Hormonal	6 Min	2 Weeks at 4°C / 39°F	High Light and heat sensitive; use amber vials, keep cold
34	Triptorelin	Hormonal	3 Hours	4 Weeks at 4°C / 39°F	Low
35	Gonadorelin	Hormonal	4 Min	2 Weeks at 4°C / 39°F	High Very short half-life; must inject immediately after prep
36	Vasopressin	Hormonal	15 Min	3 Weeks at 4°C / 39°F	Medium
37	MOTS-c	Longevity	7 Hours	3 Weeks at 4°C / 39°F	Medium
38	Epitalon	Longevity	2 Hours	4 Weeks at 4°C / 39°F	Low Tetrapeptide; relatively stable
39	SS-31	Longevity	3 Hours	3 Weeks at 4°C / 39°F	Medium Mitochondria-targeted; handle carefully
40	FOXO4-DRI	Longevity	12 Hours	2 Weeks at 4°C / 39°F	Critical Extremely expensive; aliquot into single-use portions. Do not freeze-thaw
41	Cartalax	Longevity	2 Hours	4 Weeks at 4°C / 39°F	Low Short peptide; good stability
42	Vesugen	Longevity	2 Hours	4 Weeks at 4°C / 39°F	Low Short peptide; good stability
43	Thymogen	Longevity	2 Hours	3 Weeks at 4°C / 39°F	Low
44	Thymosin Alpha-1	Immune	2 Hours	4 Weeks at 4°C / 39°F	Low
45	ARA-290	Immune	4 Hours	3 Weeks at 4°C / 39°F	Medium
46	VIP	Immune	2 Min	2 Weeks at 4°C / 39°F	High Very short half-life; degrade rapidly in solution
47	IGF-1 LR3	Other	20 Hours	2 Weeks at 4°C / 39°F	High Very potent; use precise dosing. Light and heat sensitive
48	IGF-1 DES	Other	30 Min	2 Weeks at 4°C / 39°F	High Extremely potent; short half-life. Handle with care
49	DSIP	Other	7 Min	3 Weeks at 4°C / 39°F	Medium Delta sleep-inducing peptide; very short half-life

Showing 49 of 49 peptides | Last Updated: May 2026

Peptide HandlingReference Guide

For Research Reference Only

The Golden Rules of Peptide Handling

The No-Shake Rule

Temperature Equilibration

The Reconstitution Stream

Freeze-Thaw Cycles

Additional Storage Tips

UV / Light Sensitivity

Temperature Ranges

Bacteriostatic Water

How to Read a Certificate of Analysis (COA)

Purity (HPLC)

Mass Spectrometry (MS)

Endotoxin Testing

Batch / Lot Number

Testing Date

Peptide Terminology Glossary

Lyophilized (Freeze-Dried)

Bacteriostatic Water (BAC Water)

Reconstitution

Aliquot

Half-Life

Certificate of Analysis (COA)

HPLC (High-Performance Liquid Chromatography)

LC-MS (Liquid Chromatography–Mass Spectrometry)

Endotoxin / LPS

LAL Test (Limulus Amebocyte Lysate)

ISO 17025

GMP / cGMP

Net Peptide Content vs Chromatographic Purity

TFA Salt vs Acetate Salt

Peptide Bond

Concentration Math Reference

Peptide Reference Database