MOTS-c is one of only a handful of mitochondrial-derived peptides in active research use — encoded within the mitochondrial 12S rRNA gene and released under metabolic stress to activate AMPK and restore mitochondrial function. That pedigree makes it a favorite of the longevity community, but it also makes vendor selection tricky: MOTS-c is expensive to synthesize correctly, and the price spread between a well-tested 10mg vial and a sketchy one is the difference between biology and saline.
This guide covers what to pay per milligram, why the 10mg vial dominates, what a real COA for a 16-residue peptide looks like, and how to judge which vendors are worth your order in 2026.
This is not a ranked vendor list — for that, see our Best MOTS-c Vendors comparison. This guide teaches you how to evaluate any vendor yourself.
Understanding MOTS-c Pricing
MOTS-c ships as a lyophilized powder in sealed glass vials, most commonly 5mg or 10mg. Three factors move price: vial size (bigger is cheaper per mg), vendor overhead on third-party testing, and synthesis difficulty relative to simpler peptides like BPC-157. At live prices, 10mg MOTS-c vials overlap BPC-157's per-mg range at the low end and run higher at the top end.
Current Market Pricing (2026)
Vial Size
Best For
5 mg
Tolerance testing, half-dose protocols
10 mg
Standard 10 mg/week — best all-around
20 mg
Long-cycle protocols, twice-daily stacks
The pattern is clear: 10mg is the default purchase. Stepping to 20mg usually lowers the per-mg price; at 5-10 mg/week a 20mg vial lasts 14-28 days, inside the 28-day reconstituted stability window (see the table below).
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Cost Per Week at Common Doses
Weekly Dose
5mg vials per month
10mg vials per month
10mg vs 5mg
5 mg/week (beginner)
About 4
About 2
Half as many vials
10 mg/week (standard)
About 8
About 4
Half as many vials
15 mg/week (high-dose)
About 12
About 6
Half as many vials
For current vendor-specific pricing with exact $/mg breakdowns, see our Best MOTS-c Vendors comparison.
How to Verify MOTS-c Quality
MOTS-c is a 16-amino-acid mitochondrial-derived peptide with a molecular weight of approximately 2,174.5 Da and the sequence Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg. It's harder to synthesize cleanly than smaller peptides — the two methionines and two tyrosines create oxidation risks — which is exactly why COA scrutiny matters more here than on simpler compounds.
What a COA (Certificate of Analysis) Should Include
Identity Confirmation
Mass spectrometry confirming correct molecular weight (~2,174.5 Da for MOTS-c)
Vial size selection is a tradeoff between per-mg cost and the reconstituted stability window.
The 28-Day Rule
Once mixed with bacteriostatic water, MOTS-c is stable for up to 28 days refrigerated. Sterile water (no preservative) drops this to ~24 hours. That creates a simple rule: don't reconstitute more than you can use in 28 days, and refrigerate everything.
Vial Size
At 5 mg/week
At 10 mg/week
At 15 mg/week
5 mg
7 days
3.5 days
2.3 days
10 mg
14 days
7 days
4.7 days
20 mg
28 days
14 days
9.3 days
All standard protocols fit inside the 28-day window — MOTS-c is one of the easier peptides to plan around because a 10mg vial lasts exactly one week at the standard dose.
Reported setup: Community sources describe reconstituting a fresh 10mg vial weekly and drawing from it 2-3x/week.
Recommended Vial Size by Protocol
Tolerance testing or half-dose (5 mg/week range):
Start with a 5mg vial — low upfront cost and covers a full week at beginner doses.
Standard longevity protocol (10 mg/week):
10mg vial — lasts exactly one week at 10 mg/week, the cleanest logistics for the cost.
High-dose or stack protocols (15+ mg/week):
20mg vial (when available) or 2× 10mg per week — pair with SS-31 for a full mitochondrial stack.
Buying Multiple Smaller vs One Large Vial
Factor
Multiple Small (e.g., 4× 10mg)
One Large (1× 20mg biweekly)
Cost per mg
Higher
Lower
Freshness
Better (reconstitute each week)
Risk of mid-cycle degradation
Flexibility
Can stop anytime
Committed to two-week cycles
Storage
Easier
Requires careful planning
Shipping
Can batch order monthly
Less frequent orders
What the sizes offer: 10mg vials reconstituted weekly are the most-cited MOTS-c setup. The 20mg size usually costs less per mg and lasts 14-28 days at 5-10 mg/week, which matters most for year-round protocols.
Vendor Evaluation Methodology
When comparing MOTS-c vendors, we weight three factors.
Price Competitiveness (40%)
We normalize to cost per milligram across vial sizes. A vendor selling 10mg at $80 ($8/mg) beats one selling 5mg at $55 ($11/mg), all else equal.
COA & Testing (30%)
We check that COAs are from recognized third-party labs, recent (≤6 months), verifiable on the lab's website, and cover identity, purity, and contamination. MOTS-c's synthesis difficulty means this criterion carries extra weight in practice.
Reputation (30%)
Peptide-forum feedback, shipping reliability, customer-service responsiveness, and multi-year operating history. Batch-recall history counts against a vendor even when the underlying issue was resolved.
Shipping and Storage
What to Expect When Your Order Arrives
Lyophilized MOTS-c arrives as a white or off-white powder cake in a sealed glass vial. Check:
Vial integrity — no cracks, rubber stopper seated, aluminum cap intact
Powder appearance — solid cake or loose powder, NOT liquid or discolored yellow/brown (oxidation)
Labeling — batch/lot, milligram content, "for research use only"
Cold pack — reputable vendors ship with cold packs in warm months
Storage Guidelines
State
Temperature
Duration
Lyophilized (powder)
Room temp
Weeks (shipping only)
Lyophilized (powder)
Refrigerated (2-8°C)
12-24 months
Lyophilized (powder)
Frozen (-20°C)
2+ years
Reconstituted (BAC water)
Refrigerated (2-8°C)
28 days max
Reconstituted (sterile water)
Refrigerated (2-8°C)
24 hours
Key point: MOTS-c's two methionines are oxidation-sensitive. Keep unreconstituted vials refrigerated (freeze for long-term), and mix only what you'll use within 28 days. See our MOTS-c reconstitution guide for step-by-step mixing.
Bac Water Made for Peptides
Don't risk a $300 peptide on generic bac water.
Most cloudy reconstitutions trace back to one thing — and it isn't the peptide. Sterile, non-pyrogenic, 0.9% benzyl alcohol — formulated for peptide reconstitution, not repackaged from generic stock.
✓ 0.9% benzyl alcohol✓ Made for peptides✓ 30 mL multi-dose
MOTS-c is sold as a research chemical for laboratory use, and legal status for purchasing research chemicals varies by jurisdiction. It is not FDA-approved, and vendors label product 'not for human consumption.' It is on WADA's banned list for competitive athletes, so tested-sport athletes should not use it.
How much does MOTS-c cost per month?
At the standard 10 mg/week community protocol (split 2-3x/week), monthly mass is about 40mg. A single 10mg vial covers exactly one week at that dose, so most users buy 4 vials per month. Live per-vial prices are on the Best MOTS-c Vendors page. 5mg vials cost more per mg, which is why 10mg is the default.
What vial size should I buy — 5mg or 10mg?
For a standard 10 mg/week protocol, the 10mg vial is the clear winner: one vial per week, fresh reconstitution each time, and a lower cost per mg than a 5mg vial. 5mg vials only make sense for tolerance testing or if you're running half-doses. 20mg vials (when available) usually cost less per mg again.
What purity should I look for in MOTS-c?
Look for third-party HPLC testing showing 98%+ purity and mass spec confirming the 2,174.5 Da molecular weight (MOTS-c is a 16-amino-acid mitochondrial-derived peptide). Janoshik Analytical, MZ Biolabs, and Colmaric Analyticals are the labs whose COAs are worth verifying — in-house numbers alone don't count.
Can I buy MOTS-c from a pharmacy?
No. MOTS-c is not a compounded pharmaceutical and is not available from US compounding pharmacies. It is only accessible through research peptide vendors. Anyone claiming pharmacy-grade MOTS-c is misrepresenting the product.
This article is for educational and informational purposes only. It is not medical advice and should not be used to diagnose, treat, or prevent any condition. Consult a licensed healthcare provider before using any peptide.
