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Frequently Asked Questions
WHAT EXACTLY IS A RESEARCH PEPTIDE?+
A short chain of amino acids synthesized for in-vitro and preclinical experiments. Everything we sell is strictly for laboratory work - not for human or veterinary use.
HOW DO YOU VERIFY PURITY?+
Each lot is sent to an independent, accredited lab for HPLC and mass-spec analysis before we release it.
DO YOU SHIP INTERNATIONALLY?+
Yes, to a defined list of destinations: the United States, Canada, the United Kingdom, and all 27 European Union member states. Everything ships for laboratory research use only and is never marketed for human consumption. International orders move by tracked courier at a flat rate shown at checkout, and the recipient covers any import duties.
AM I ELIGIBLE TO PLACE AN ORDER?+
Orders are restricted to qualified researchers, institutions, and lab buyers. By checking out you confirm you are 21 or older and that the compounds will be handled in accordance with all applicable laws for research purposes only.
HOW FAST WILL MY ORDER GO OUT?+
Same business day for orders placed before 1pm EST. Anything after the cutoff ships the following business day. Tracking is emailed automatically once the label is generated.
CAN I TRACK MY SHIPMENT?+
Yes - a tracking link lands in your inbox the moment your package leaves us, and you can follow it through delivery.
WHICH PAYMENT METHODS DO YOU ACCEPT?+
Zelle and Cash App at checkout. Payment instructions are shown right after you place your order.
WHY ORDER FROM ZERILYX?+
Tight catalog, signed third-party assays on every batch, same-day domestic dispatch, and a replacement guarantee if a lot ever falls short of spec.
Research Library
Guides & Lab References
Compound guides, reconstitution references, and buyer checklists - written for researchers, not for hype.
Compound Guides
9 articles8 min read
GHK-Cu Research Guide: Mechanism, Dosing & Skin/Wound Studies
GHK-Cu is the copper-bound form of the tripeptide glycyl-L-histidyl-L-lysine. It naturally occurs in human plasma and declines with age. Decades of laboratory work show it modulates wound-healing, antioxidant, and tissue-remodeling genes, which is why it has become one of the most-studied research peptides in dermatology and regenerative biology.
Read article9 min read
BPC-157 Explained: How It Works, Research Uses & Safety
BPC-157 (Body Protection Compound) is a stable 15-amino-acid pentadecapeptide derived from a protective sequence in human gastric juice. It has been studied for almost three decades for its effects on tissue repair, angiogenesis, gastrointestinal protection, and tendon/ligament healing in animal models.
Read article7 min read
GLOW Peptide Blend: GHK-Cu + BPC-157 + TB-500 Research Overview
GLOW is the trade name for a three-peptide research blend combining GHK-Cu, BPC-157, and TB-500 in a single lyophilized vial. It is one of the most-purchased research blends in the US peptide market because the three compounds cover complementary tissue-repair pathways.
Read article7 min read
Tesamorelin: GHRH Analog Mechanism, Visceral Fat Studies & Research Dosing
Tesamorelin is a synthetic 44-amino-acid analog of growth-hormone-releasing hormone (GHRH) with a trans-3-hexenoic acid modification that resists enzymatic breakdown. It is the only GHRH peptide approved by the FDA as a finished drug product (Egrifta) and is sold here strictly as a research reagent.
Read article8 min read
GLP-3 / Retatrutide: Triple GIP/GLP-1/Glucagon Agonist Research Brief
Retatrutide (LY3437943) is a once-weekly triple hormone receptor agonist that activates GIP, GLP-1, and glucagon receptors from a single molecule. It is sometimes informally referred to as 'GLP-3' because it represents the third major generation in the GLP-class metabolic peptide lineage after semaglutide (GLP-1) and tirzepatide (GIP/GLP-1).
Read article7 min read
BPC-157 vs TB-500: Mechanism, Research Use & How They Differ
BPC-157 and TB-500 (Thymosin Beta-4 fragment) are the two most-cited peptides in tissue-repair research. They are frequently confused, often stacked, and operate through distinct mechanisms. This guide breaks down what the published literature actually says about each.
Read article8 min read
Semaglutide vs Tirzepatide: GLP-1 Mono vs Dual-Agonist Research
Semaglutide is a GLP-1 receptor agonist. Tirzepatide is a dual GLP-1/GIP agonist. The two peptides dominate metabolic-research literature, and the head-to-head SURMOUNT and SURPASS data are why the dual-agonist class has become the new benchmark.
Read article7 min read
Retatrutide vs Tirzepatide: Triple Agonist vs Dual Agonist Research
Retatrutide adds glucagon-receptor activity on top of the GLP-1/GIP dual agonism that defines tirzepatide. The Phase 2 readout (NEJM, 2023) made it the most-watched investigational peptide in metabolic research.
Read article6 min read
Ipamorelin vs CJC-1295: GHRH Analog vs GH Secretagogue Research
Ipamorelin and CJC-1295 are the two most-stacked growth-hormone peptides in research. They work on different receptors, produce complementary GH pulses, and together generate a larger response than either compound alone.
Read articleLab Reference
5 articles6 min read
How to Reconstitute a Peptide (Step-by-Step Laboratory Reference)
Reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide into sterile diluent - usually bacteriostatic water - to produce a known concentration. The math is straightforward once you separate vial size, diluent volume, and per-administration volume.
Read article7 min read
BPC-157 Dosage & Research Protocols (Laboratory Reference)
This is a laboratory-reference summary of how BPC-157 is dosed across the published preclinical literature. It is not medical or dosing advice - BPC-157 is not approved by the FDA for human use.
Read article5 min read
GHK-Cu Dosing in Published Research
GHK-Cu appears in the literature in both topical and injectable formats. This page summarizes the concentration ranges most commonly cited.
Read article5 min read
Peptide Storage: Lyophilized vs. Reconstituted Shelf Life
Lyophilized peptides are stable for years if stored cold and dry. Once reconstituted, the clock starts. This page summarizes the storage windows most commonly used in research labs.
Read article6 min read
Peptide Lab Safety & Sterile Technique: A Practical Reference
Sterile technique is the single largest determinant of peptide stability and contamination risk in a research setting. This reference covers the practical SOPs that the published reconstitution protocols assume but rarely state.
Read articleBuyer Guides
3 articles6 min read
Reading a Peptide COA: What Purity & HPLC Numbers Actually Mean
A Certificate of Analysis (COA) is the document that proves a peptide is what the vendor says it is. A real COA is a third-party lab report - not a marketing PDF. This guide walks through every section so you can spot a legitimate document at a glance.
Read article6 min read
Where to Buy Research Peptides in the US (Buyer's Checklist)
The US research-peptide market is unregulated at the vendor level, which means quality varies enormously. This checklist captures what experienced labs evaluate before placing a first order with any new supplier.
Read article6 min read
Peptide Blends Explained: Why GLOW, Wolverine & KLOW Combine Compounds
A peptide blend is a single lyophilized vial containing two or more synthesized peptides combined at fixed ratios. Blends are popular in laboratory tissue-repair research because they reduce reconstitution steps and lock in a consistent component ratio across study days.
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