Choosing the Right Vial Size
The 14-21 Day Stability Rule (Tesamorelin's Tighter Window)
Tesamorelin reconstituted with bacteriostatic water and refrigerated is documented stable for roughly 14-21 days — shorter than the 28 days for ipamorelin. The blend takes the more conservative stability number, so the operating window is 14-21 days reconstituted.
6mg blend
5 days
2.5 days
~8 days
12mg blend
10 days
~17 days ⚠️
⚠️ = at the edge of the 14-21 day stability window
Practical implication: A 12mg blend at standard 1mg+200mcg/day fits the stability window cleanly. At lower doses (0.5mg + 200mcg/day), the vial pushes the window edge — staged reconstitution or smaller 6mg vials are common.
Vial Size by Protocol
Tolerance testing:
A 6mg blend vial is the smallest unit cited
2.5-8 days at standard doses
Standard 1mg+200mcg/day community protocol:
12mg blend vial — lasts 10 days, well within stability window
3 vials per month at this dose
The most-cited size in vendor sales data
Phase III 2mg/day tesamorelin protocol:
12mg blend at 2mg+200mcg/day = 5 days per vial
6 vials per month — kit pricing meaningful here
Buying Multiple Smaller vs Kit
Cost per total mg
Higher ($7.50-15/mg)
Lower ($6.67-13.33/mg)
Freshness
Same (lyophilized storage)
Same
Flexibility
Can stop mid-cycle
Committed to full kit
Storage
Easier (smaller volumes)
Requires fridge space
Shipping
More frequent orders
Single shipment
Why This Blend Costs More Than CJC-1295/Ipamorelin
A common question: tesamorelin/ipamorelin runs $7.50-15/mg total vs $5-9/mg for CJC-1295/ipamorelin. Three reasons:
1. Tesamorelin is a longer peptide. 44 residues vs 29 residues for CJC-1295 no-DAC. Solid-phase peptide synthesis cost scales with chain length.
2. Hexenoyl modification adds synthesis cost. Tesamorelin's trans-3-hexenoic acid N-terminal modification requires a specialized synthesis step that CJC-1295 doesn't need.
3. Stronger clinical data base. Tesamorelin has Phase III RCT data; CJC-1295 does not. The premium reflects evidence quality, not just synthesis cost.
For users who tolerate the cost premium and prioritize evidence quality, tesamorelin/ipamorelin is the documented option. For users prioritizing per-mg cost, CJC-1295/ipamorelin remains the budget alternative.
Vendor Evaluation Methodology
When comparing tesamorelin/ipamorelin blend vendors:
Price Competitiveness (40%)
Normalize to cost per total milligram. 12mg blend at $130 ($10.83/mg) scores higher than 12mg at $180 ($15/mg).
COA & Testing (30%)
Per-peptide reports (separate mass spec and HPLC)
Third-party labs (Janoshik, MZ Biolabs, Colmaric)
Recent (within 6 months)
Verifiable task number
Both molecular weights confirmed (5,196 Da AND 711.85 Da)
Reputation (30%)
Community feedback, shipping reliability, customer service, multi-year track record. Tesamorelin specifically has a counterfeit history — vendor reputation is heavily weighted here.
Shipping and Storage
Order Arrival
Lyophilized blend typically arrives as a single white or off-white powder cake:
Vial integrity — no cracks, intact rubber seal, aluminum cap secure
Powder appearance — solid cake or loose powder, NOT liquid or discolored
Labeling — batch/lot, total mg content, ratio (e.g., "10mg + 2mg"), "for research use only"
Cold pack — most reputable vendors include cold packs in summer (especially important for tesamorelin)
Storage Guidelines
Lyophilized (powder)
Room temp
Days only (shipping)
Refrigerated (2-8°C)
12+ months
Frozen (-20°C)
24+ months
Reconstituted (BAC water)
~14-21 days (tesamorelin's tighter window)
Reconstituted (sterile water)
~24 hours
Reconstituted
Frozen
Not generally recommended (degrades hexenoyl modification)
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