Choosing the Right Vial Size
The 28-Day Stability Rule
GHRP-2 reconstituted with bacteriostatic water and refrigerated is documented stable for roughly 28 days. With sterile water (no preservative), the window collapses to ~24 hours.
2mg
~7 days
~3 days
20 days
5mg
~17 days
~8 days
50 days ⚠️
10mg
~33 days ⚠️
100 days ⚠️
⚠️ = exceeds 28-day reconstitution stability window
Practical implication: A 5mg vial at 100mcg×3/day fits the window. Higher doses or larger vials require staged reconstitution.
Vial Size by Protocol
Tolerance testing:
A 2mg or 5mg vial is the smallest unit cited
Standard 100mcg×3/day pulse-mimetic protocol:
5mg vial — 17 days, fits the stability window
10mg vial with staged reconstitution for larger users
Why GHRP-2 Costs Less Than Ipamorelin
GHRP-2 runs $3-7/mg vs $4-8/mg for ipamorelin — small but consistent gap. Reasons:
1. Simpler synthesis. Both peptides have D-amino acids, but ipamorelin has the more expensive Aib (alpha-aminoisobutyric acid) residue.
2. Less receptor selectivity = lower commercial value. GHRP-2 elevates cortisol and prolactin at higher doses; ipamorelin doesn't. Buyers who care about that selectivity pay the premium for ipamorelin.
For users where cortisol/prolactin elevation is acceptable (e.g., bulking-phase protocols), GHRP-2 is the budget option.
Vendor Evaluation Methodology
Price Competitiveness (40%)
Normalize to cost per milligram.
COA & Testing (30%)
Third-party labs (Janoshik, MZ Biolabs, Colmaric)
Recent (within 6 months)
Mass spec confirming 817.41 Da
Reputation (30%)
Community feedback, shipping reliability, customer service.
Shipping and Storage
Storage Guidelines
Lyophilized
Refrigerated (2-8°C)
12+ months
Frozen (-20°C)
24+ months
Reconstituted (BAC water)
Refrigerated
~28 days
Reconstituted (sterile water)
~24 hours
Where to Buy
Ascension Peptides
Lowest effective pricing in the market after an exclusive 50% off through our link. Independent COA testing across the catalog.
Ion Peptide
Strong blend lineup and competitive singles pricing. Pre-mixed combinations simplify reconstitution and dosing.
EZ Peptides
Broadest verified catalog with QR-linked COAs on every product. Fast domestic shipping and a 30-day guarantee.
Glacier Aminos
Research peptide vendor with COA documentation and an exclusive 10% off discount.
Nura Peptide
Niche-format vendor — oral capsule peptides, pre-mixed nasal solutions, and a rare Reta + Cagrilintide combo blend, all 25% off with code thepeptidecatalog.
Mile High Compounds
Partner vendor with verified inventory and COA documentation.
Swiss Chems
Broad catalog with international shipping — useful for researchers outside the US.
Ascension Peptides
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50% off
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Ion Peptide
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15% off
EZ Peptides
10% off
Glacier Aminos
Nura Peptide
25% off
Mile High Compounds
Swiss Chems