Choosing the Right Vial Size
The 28-Day Stability Rule
Both CJC-1295 (no-DAC) and ipamorelin reconstituted with bacteriostatic water and refrigerated are documented stable for roughly 28 days in published peptide-stability literature. Once reconstituted with sterile water (no preservative), that window collapses to ~24 hours.
5mg blend
25 days
12.5 days
8 days
10mg blend
50 days ⚠️
~17 days
20mg blend
100 days ⚠️
~33 days ⚠️
⚠️ = exceeds 28-day reconstitution stability window
Practical implication: A 10mg blend is the largest vial size that aligns with standard 200mcg+200mcg protocols inside the 28-day stability window. At lower doses (100mcg+100mcg), reconstitution is staged so each batch is used within 28 days regardless of vial size on hand.
Vial Size by Protocol
Tolerance testing context:
A single 5mg blend vial is the smallest unit cited for testing tolerance to both peptides simultaneously
Roughly 12-25 days of supply at standard doses
Standard 200mcg+200mcg/day community protocol:
10mg blend vial — lasts 25 days, well within stability window
The most-cited size in community discussions and vendor sales data
2-4 vials at a time covers an 8-16 week cycle
Extended protocols (24+ weeks):
Kit purchases (10mg × 5) drop per-mg cost to ~$4-7/mg
Each vial stored sealed and lyophilized until reconstitution
Sealed lyophilized vials are documented stable for 12+ months refrigerated
Buying Multiple Smaller vs Kit
Cost per total mg
Higher ($5-9/mg)
Lower ($4-7/mg)
Freshness
Same (lyophilized storage equivalent)
Same
Flexibility
Can stop mid-cycle
Committed to full kit
Storage
Easier (smaller volumes)
Requires fridge space
Shipping
More frequent orders
Single shipment
Common community pattern: 1-2× 10mg singles to validate source and assess tolerance, with kit purchases reserved for confirmed responders running 12+ week cycles.
CJC-1295 With DAC vs Without DAC — Why It Matters for Pricing
The "CJC-1295" label covers two structurally different peptides with very different pharmacokinetics:
CJC-1295 no-DAC (Mod GRF 1-29):
Molecular weight: 3,367 Da
Half-life: ~30 minutes
Pulse-mimetic — pairs naturally with ipamorelin's short ghrelin pulse
The standard component in 95%+ of blend vials
CJC-1295 with DAC:
Molecular weight: 3,649 Da
Half-life: ~6-8 days (Drug Affinity Complex extends serum residence)
Continuous GH elevation rather than pulses
Rarely blended with ipamorelin — the long-acting profile defeats the pulse-mimetic rationale
The pricing reflects this. CJC-1295 no-DAC runs $5-9/mg standalone; CJC-1295 with DAC runs $8-14/mg standalone. Blend vials almost always use no-DAC because that's what makes pharmacological sense alongside ipamorelin. Vendors that ship "CJC-1295/ipamorelin" without specifying which variant have failed basic disclosure — verify with the COA before purchasing.
Vendor Evaluation Methodology
When comparing CJC-1295/ipamorelin blend vendors, three weighted factors matter:
Price Competitiveness (40%)
Normalize to cost per total milligram for fair comparison. A vendor selling 10mg blend at $60 ($6/mg total) scores higher than one selling 5mg at $50 ($10/mg total), all else being equal. Kit pricing weighted separately because it requires larger upfront commitment.
COA & Testing (30%)
Verified that COAs are:
Per-peptide (separate mass spec and HPLC for CJC-1295 and ipamorelin)
From recognized third-party labs (Janoshik, MZ Biolabs, Colmaric)
Recent (within 6 months)
Verifiable on the lab's website
Explicitly state DAC vs no-DAC
Reputation (30%)
Community feedback, shipping reliability, customer service responsiveness, and business track record. Additional weight given to vendors with consistent multi-year operations and no documented batch substitution history.
Shipping and Storage
What Order Arrival Typically Looks Like
Lyophilized blend vials typically arrive as a single white or off-white powder cake in a sealed glass vial:
Vial integrity — no cracks, intact rubber seal, aluminum cap secure
Powder appearance — solid cake or loose powder, NOT liquid or discolored
Labeling — batch/lot number, total mg content, ratio (e.g., "5mg + 5mg"), "for research use only"
Cold pack — most reputable vendors ship with cold packs in summer
Storage Guidelines
Lyophilized (powder)
Room temp
Days only (shipping)
Refrigerated (2-8°C)
12+ months
Frozen (-20°C)
24+ months
Reconstituted (BAC water)
~28 days
Reconstituted (sterile water)
~24 hours
Reconstituted
Frozen
Not generally recommended
See the CJC-1295/ipamorelin reconstitution guide for documented mixing procedures.
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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Ion Peptide
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15% off
EZ Peptides
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Glacier Aminos
Nura Peptide
25% off
Mile High Compounds
Swiss Chems