Proper storage and reconstitution of research peptides is fundamental to obtaining reproducible, reliable experimental results. The biological activity of peptides is sensitive to handling conditions — improper storage or reconstitution can lead to partial or complete loss of activity, introducing variability that undermines experimental conclusions. This guide covers essential practices relevant to peptide and protein research compounds available at Wellchain, including specialised considerations for different compound classes.
Understanding Lyophilisation and Long-Term Stability
All Wellchain research peptides are supplied as lyophilised (freeze-dried) powders. Lyophilisation removes water from the peptide preparation under vacuum at low temperature, leaving behind a dry, stable peptide cake or powder. This process dramatically extends stability compared to aqueous solutions by eliminating hydrolysis and oxidation reactions that degrade peptides in solution. The general principle for lyophilised peptide storage is: -20°C for standard peptides, -80°C for recombinant proteins. Standard peptides including BPC-157, TB-500, GHK-Cu, and longevity peptides like Epithalon and SS-31 are stable for 24+ months at -20°C. Recombinant proteins such as HGH 10 IU and IGF-1 LR3 benefit from -80°C storage for maximum long-term stability.
Reconstitution Best Practices
The reconstitution step is where researchers can inadvertently introduce degradation. Key principles:
- Solvent selection: Most peptides dissolve readily in sterile bacteriostatic water or physiological saline. Exceptions: IGF-1 LR3 should be reconstituted in 0.1% acetic acid with 0.1% BSA to prevent adsorption to plastic surfaces; GHK-Cu reconstitutes in sterile water (PBS also acceptable, but avoid EDTA-containing buffers which strip the copper ion); 5-Amino-1MQ and SLU-PP-332 require DMSO stock preparation before aqueous dilution.
- Temperature: Bring lyophilised vials to room temperature before adding solvent to prevent thermal shock and condensation contamination of the powder.
- Gentle mixing: Never vortex peptide solutions — this introduces air bubbles and shear forces that can disrupt peptide structure, especially for larger proteins like HGH. Swirl gently or use slow end-over-end rotation.
- Volume: Add solvent in small increments along the vial wall; avoid directing the stream directly onto the lyophilised cake.
Aliquoting to Prevent Freeze-Thaw Degradation
The most impactful practice for preserving peptide activity during ongoing research is aliquoting immediately upon reconstitution. Every freeze-thaw cycle introduces degradation risk through ice crystal formation damaging peptide structure, concentration changes during partial thawing, and increased surface exposure to oxygen. Best practice: immediately after reconstitution, divide the solution into single-use aliquots of the volume needed per experiment. For example, if reconstituting BPC-157 10mg to 1mg/mL and using 0.5mg per experiment, prepare 20 x 0.5mL aliquots for storage at -20°C, or at 2-8°C if use is imminent. Use low-binding microcentrifuge tubes for small-volume aliquots, as protein adsorption to standard plastic surfaces can be significant for dilute solutions.
Special Considerations by Compound Class
NAD+ (500mg): Unlike peptides, NAD+ is hygroscopic and degrades rapidly when exposed to moisture. Store the dry powder desiccated at -20°C and prepare fresh aqueous solutions for each experiment when feasible. NAD+ solutions degrade faster at acidic pH and elevated temperature — prepare fresh and use promptly.
Copper peptides (GHK-Cu): The copper(II) coordination complex in GHK-Cu makes it light-sensitive. Store reconstituted solutions in amber vials and avoid prolonged UV exposure. EDTA-containing buffers will chelate the copper and fundamentally alter the compound’s properties — use copper-free buffer systems only.
Recombinant proteins (HGH, IGF-1 LR3): These are significantly more sensitive than synthetic peptides. Never freeze reconstituted HGH — this denatures the protein irreversibly. IGF-1 LR3 requires low-binding storage vessels and BSA carrier protein to prevent surface adsorption losses, particularly at low concentrations used in cell-based assays.
All compounds described are for laboratory research use only. Not for human or veterinary use.
