Storage & Stability
Testagen Storage & Stability: Cold Chain, Half-Life & Shelf Life
3 min read•Published 2025-09-09•Quality Peptide USA Research
Testagen is a synthetic tetrapeptide bioregulator (Lys-Glu-Asp-Gly) studied in thymic and immune research models. It is part of the bioregulator peptide family used in cellular aging and immune-function investigations.. This guide covers storage & stability for Testagen — written for laboratory researchers sourcing US-synthesized peptides from Quality Peptide USA.
Lyophilized Shelf Life
Sealed lyophilized Testagen stored at 2–8°C maintains potency through the expiration date listed on the certificate of analysis (typically 24–36 months from manufacture). Short transit exposure to room temperature during shipping does not meaningfully degrade lyophilized peptide — the vacuum-sealed solid form is highly stable. Once received, refrigerate promptly for long-term storage.
Reconstituted Solution Stability
Lyophilized: 2–8°C. Reconstituted: refrigerate, use within 30 days. Benzyl alcohol in bacteriostatic water provides bacteriostatic protection but does not extend chemical stability indefinitely. Investigators running multi-week protocols should plan their aliquoting strategy in advance.
Reported Research Half-Life
Reported in-vitro / preclinical half-life for Testagen: Short systemic life (research models) Half-life depends on study system — plasma, tissue culture media, and intact-animal models all yield different effective windows.
Cold-Chain Shipping by Quality Peptide USA
Every order of Testagen ships with insulated cold packaging for transit, dispatched from US facilities on the same day for orders placed before 2 PM EST. Tracking is provided on every shipment so research teams can plan receiving and cold-room storage.
Research Use Only
All content is for laboratory and in-vitro research contexts only. Not intended to diagnose, treat, or prevent any condition. Not for human or veterinary consumption.
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