Research Guides

Peptide Storage Guide

Comprehensive storage reference for every compound in the Nexphoria catalog. Lyophilized vs reconstituted requirements, freeze-thaw cycle limits, light sensitivity, and container recommendations — sourced directly from technical specifications.

−20°C compounds

Fridge-only compounds

Light-sensitive

Hygroscopic

Core Storage Principles

Lyophilized (Dry Powder)

Most stable form — typically 24 months at −20°C when stored desiccated
Keep sealed in original vial until ready to reconstitute
Desiccant packs in storage container prevent moisture uptake
Allow vial to warm to room temperature before opening to prevent condensation on the powder
Once a vial is opened, moisture exposure begins — reconstitute promptly

Reconstituted (In Solution)

Significantly shorter stability: typically 30 days at 4°C, up to 6 months at −20°C
Use bacteriostatic water (BAC water) for multi-dose vials — 0.9% benzyl alcohol prevents bacterial growth
Use sterile water only if entire vial will be used within 24 hours
Minimize freeze-thaw cycles — each cycle risks protein denaturation and aggregation
Label vials with reconstitution date; discard at stability endpoint

Freeze-Thaw Cycles

Maximum recommended: 3–5 freeze-thaw cycles for most peptides
Aliquot reconstituted solution into single-use volumes to avoid repeated freeze-thaw
Use low-protein-binding microtubes (1.5mL polypropylene) for aliquots
Flash-freeze aliquots in dry ice / liquid nitrogen for best stability
Peptides with disulfide bonds (oxytocin, ss-31) are especially sensitive

Light Sensitivity

UV exposure causes photodegradation — use amber vials or foil-wrapped storage for sensitive compounds
Melanotan-II, PT-141, and other melanocortin peptides require strict light protection
GHK-Cu oxidizes under UV — store in opaque container
Even short bench exposure during reconstitution can cause measurable degradation
Wrap vials in foil during reconstitution if working under bright lab lighting

Hygroscopic Compounds

NAD+ is highly hygroscopic — absorbs atmospheric moisture rapidly
Store in airtight containers with silica gel desiccant
Work quickly when handling hygroscopic powder
If powder clumps after storage, it has absorbed moisture — assess purity before use
Nitrogen-purged storage vials provide optimal protection

Container & Organization

Use labeled cryovials (1.5mL, low-protein-binding polypropylene) for reconstituted aliquots
Label format: compound name | concentration | reconstitution date | lot #
Store in clearly labeled compartmentalized boxes — separate lyophilized from reconstituted
Keep a storage log: date received, lot #, reconstitution date, remaining volume
Do not store near ethanol or other volatile chemicals — vapor can contaminate

Storage by Temperature Class

Requirements sourced from individual product technical specifications.

−20°C Freezer27 compounds

Standard deep-freeze. Use airtight desiccant storage. Allow vials to equilibrate to room temperature before opening to prevent condensation.

Compound	Category	Stability	Flags	Full Spec
BPC-157	Recovery & Healing	24 months	Light	−20°C, desiccated, protect from light. Stable 24 months lyophilized.
TB-500	Recovery & Healing	24 months	—	−20°C, desiccated. Lyophilized powder stable 24 months.
Ipamorelin	Growth Hormone	24 months	—	−20°C, desiccated. Lyophilized powder stable 24 months.
CJC-1295	Growth Hormone	24 months	Light	−20°C, desiccated, protected from light. Lyophilized stable 24 months.
CJC-1295 / Ipamorelin	Growth Hormone	24 months	Light	−20°C, desiccated, protected from light. Stable 24 months lyophilized.
Sermorelin	Growth Hormone	24 months	Light	−20°C, desiccated, protected from light. Lyophilized stable 24 months.
Semaglutide	Weight Management	24 months	—	−20°C, desiccated. Stable 24 months lyophilized.
Tirzepatide	Weight Management	24 months	—	−20°C, desiccated. Stable 24 months lyophilized.
Retatrutide	Weight Management	24 months	—	−20°C, desiccated. Stable 24 months lyophilized.
AOD-9604	Weight Management	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
Epitalon	Anti-Aging	24 months	—	−20°C, desiccated. Lyophilized powder stable 24 months. Protect from moisture.
Semax	Cognitive	24 months	—	−20°C, desiccated. Aqueous solutions at 2–8°C stable 30 days.
NAD+	Wellness	24 months	Hygroscopic	−20°C, anhydrous conditions. Highly hygroscopic — minimize atmospheric exposure. Stable 24 months.
PT-141	Wellness	24 months	Light	−20°C, desiccated, protected from light.
Melanotan-II	Wellness	24 months	Light	−20°C, desiccated, protected from light. Sensitive to UV degradation.
Thymosin Alpha-1	Wellness	24 months	—	−20°C, desiccated. Lyophilized powder stable 24 months.
LL-37	Wellness	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
MOTS-c	Anti-Aging	24 months	Light	−20°C, desiccated, protect from light. Lyophilized stable 24 months.
SS-31 (Elamipretide)	Anti-Aging	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
CJC-1295 No DAC	Growth Hormone	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
DSIP	Cognitive	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
Kisspeptin-10	Wellness	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
Oxytocin	Wellness	24 months	Light	−20°C, desiccated, protect from light. Lyophilized stable 24 months.
KPV	Recovery & Healing	24 months	—	−20°C, desiccated. Lyophilized stable 24 months.
Wolverine Stack	Recovery & Healing	24 months	Light	−20°C, desiccated, protect from light. Lyophilized stable 24 months.
GLOW Stack	Anti-Aging	24 months	—	−20°C, desiccated. Each compound stored per individual requirements.
KLW Stack	Wellness	24 months	—	−20°C each vial, desiccated. Stable 24 months lyophilized.

2–8°C Refrigerator4 compounds

Standard refrigerator. Do NOT freeze — ice crystal formation can denature the peptide structure. Keep away from door (temperature fluctuations).

Compound	Category	Stability	Flags	Full Spec
GHK-Cu	Anti-Aging	18 months	LightNo Freeze	2–8°C, protect from light. Avoid freeze-thaw cycles. Stable 18 months.
Selank	Cognitive	18 months	Light	2–8°C refrigerated, protect from light. Stable 18 months lyophilized.
Tesamorelin	Growth Hormone	18 months	LightNo Freeze	2–8°C, protect from light. Refrigerate; do not freeze. Stable 18 months.
Snap-8	Anti-Aging	18 months	LightNo Freeze	2–8°C, protect from light. Stable 18 months. Do not freeze.

Cool, Dry Place (15–25°C)1 compounds

Room temperature storage in a cool, dry environment. Keep away from heat sources, direct sunlight, and humidity.

Compound	Category	Stability	Flags	Full Spec
MK-677 (Ibutamoren)	Growth Hormone	24 months	Light	Cool, dry place (15–25°C). Protect from light and moisture. Stable 24 months sealed.

Reconstituted Solution Stability

Once reconstituted, peptide solutions have significantly reduced stability compared to the lyophilized form. Use bacteriostatic water for multi-dose vials.

Condition	Solvent	Stability	Notes
4°C (Refrigerator)	Bacteriostatic Water (BAC)	30 days	Recommended for active-use multi-dose vials. Benzyl alcohol prevents microbial growth.
4°C (Refrigerator)	Sterile Water	24–48 hours	Use only if entire vial will be consumed same day or next day.
−20°C (Freezer)	Bacteriostatic Water (BAC)	3–6 months	Preferred for long-term post-reconstitution storage. Aliquot to minimize freeze-thaw.
−80°C (Ultra-low freezer)	Bacteriostatic Water (BAC)	12+ months	Research-lab optimal. Not standard for most users. Minimizes oxidative degradation.
Room Temperature	Any	<4 hours	Working solution only. Never store at room temperature for extended periods.

Aliquoting Protocol

To minimize freeze-thaw cycles, divide reconstituted solution into single-use volumes immediately after reconstitution:

1Reconstitute in minimum needed BAC water volume (100–200 μL is typical for 10mg vials)
2Use a sterile 1 mL syringe to draw the full solution
3Dispense equal volumes into labeled 1.5mL low-protein-binding polypropylene microtubes
4Each microtube = one dose or one session's doses — never return to original vial
5Store all aliquots at −20°C; transfer one to fridge (4°C) 30 min before use
6Label: compound | concentration (e.g., 2 mg/mL) | date | lot #

Special Handling Compounds

These compounds have above-average storage sensitivity and require additional precautions.

NAD+Highly hygroscopic

Store under anhydrous conditions — nitrogen purge recommended
Silica gel desiccant packs in airtight secondary container are essential
Work quickly during reconstitution; avoid extended air exposure
Clumping indicates moisture absorption — assess before use

GHK-CuFridge-stable, light-sensitive

Do NOT freeze — ice crystal formation degrades the copper complex
Store at 2–8°C; avoid freeze-thaw cycles entirely
Protect from UV — copper peptides photodegrade rapidly
18-month lyophilized stability (shorter than most peptides)

Melanotan-IIUV-sensitive, light-sensitive

Particularly sensitive to UV and visible light — store in amber vials or foil-wrapped
Keep reconstituted solution in a dark refrigerator compartment
Even brief bench exposure under fluorescent lighting causes measurable degradation
Wrap vial in foil during reconstitution

PT-141 (Bremelanotide)Light-sensitive melanocortin

Same light-sensitivity profile as Melanotan-II
Store in dark, desiccated conditions at −20°C
Reconstituted: 30 days at 4°C in light-protected vial
Avoid turbid or discolored solutions — sign of degradation

TesamorelinFridge-only, no freeze

Refrigerate at 2–8°C — do not freeze
18-month stability (shorter lyophilized shelf life)
GRF analog with long chain susceptible to freeze-induced denaturation
Keep away from back of refrigerator (cold spots near cooling element)

Snap-8Fridge-stable, no freeze

Store at 2–8°C — do not freeze; cosmetic peptide with peptide-bond sensitivity
18-month stability lyophilized
Reconstituted solutions: use within 30 days at 4°C
Protect from light; carrier solvents may affect long-term stability

Quick Reference

Storage Checklist

Do

Store lyophilized peptides at −20°C in desiccated, sealed vials
Use bacteriostatic water for multi-dose reconstituted vials
Aliquot reconstituted solution to minimize freeze-thaw cycles
Allow frozen vials to warm to room temp before opening
Label all vials with compound, concentration, date, lot #
Use amber vials or foil wrapping for light-sensitive compounds
Keep a detailed storage log for each compound
Store in low-protein-binding polypropylene containers
Use silica gel desiccant packs in the storage container
Check for turbidity or color change before each use

Don't

Freeze fridge-only compounds (GHK-Cu, Snap-8, Tesamorelin, Selank)
Store reconstituted solutions at room temperature for extended periods
Vortex peptide solutions — this shears and denatures peptides
Use glass containers for reconstituted solutions (protein binding risk)
Leave light-sensitive compounds exposed on the bench
Neglect to note reconstitution date — assume degradation after stability window
Return drawn solution back into the vial (contamination risk)
Open frozen vials before they reach room temperature
Store peptides near volatile chemicals (ethanol, acetone)
Exceed 5 freeze-thaw cycles on any reconstituted solution

Related Resources

Reconstitution CalculatorTool

Calculate BAC water volume and dose volumes for any peptide vial.

Open →

BAC Water GuideGuide

What bacteriostatic water is, why it works, and how to use it safely.

Open →

Half-Life CalculatorTool

Plasma half-life, clearance milestones, and dosing intervals for 30+ compounds.

Open →

Research Use Only. Storage recommendations on this page are based on published stability data and technical specifications for research-grade lyophilized peptide compounds. This information is intended for qualified researchers operating in accordance with applicable institutional and regulatory guidelines. Nexphoria compounds are not approved for human therapeutic use.