Powered by Bar13 Ventures

The full stakk
management platform.

Stakk Smart. Stakk Dialed.

From research to reorder, in one platform — research-grade Library, multi-peptide Schedule, dose math, vetted suppliers, and async practitioner review when you want it.

From your first protocol to your hundredth.

  • 01DecideResearch-grade Library + AI Advisor
  • 02BuildStakk-aware Advisor + multi-peptide Schedule
  • 03DoseCalculator with reconstitution & shelf-life
  • 04RunSchedule with adherence logging
  • 05ResupplyVetted Supplier Directory + auto-reorder
  • 06ReviewAsync practitioner stakk reviews
No clinical relationship required
Practitioner support when you want it

Built mobile-first. Runs on your device.

PepStakk is designed to work wherever you do — phone, tablet, or desktop. Core tools will be available offline so you can reference dosing and safety details anywhere, even without a connection.

✓ iOS · Android · Desktop
✓ Offline ready
Why PepStakk exists

Built to fix four problems existing tools never solved together.

Peptides are one of the fastest-growing categories in self-directed health — and one of the worst-served.

01
Information is segmented. We connected it.
Research lives across PubMed, FDA, ClinicalTrials.gov, NIH, Reddit, and YouTube. Our Library pulls primary sources into one filtered, evidence-tiered reference — plain-language for beginners, citations for pros.
02
Tools don't talk to each other. Ours do.
Calculators exist. Schedulers exist. Almost nothing connects them. PepStakk is one connected system: Library → Advisor → Schedule → Calculator → Suppliers → Practitioner Network. One stakk view, end to end.
03
Sourcing is opaque. We made it transparent.
We score suppliers on a 100-point rubric across regulatory, quality, sterility, compliance, and operations — with hard disqualifiers that override the score. The directory is public. The criteria are too.
04
Clinical pathways aren't always available — or wanted.
Our practitioner network offers async stakk reviews on demand. You decide if and when you want one. We don't force you into a clinical relationship to manage your own protocol.
The vertically integrated stack

Six layers. One platform.

PepStakk is the only peptide platform that owns six connected layers. Calculators own one. Schedulers own one. Clinics own one. Content sites own one. PepStakk owns the whole stack — and the integration is what makes a real workflow possible without four apps and a notes file.

#
Layer
What it does
How
Status
01
Decide
Know what to run. Know what the research actually says.
Library (four-tier evidence) + AI Advisor
Shipped
02
Build
Architect the stakk — peptides, doses, timing, cycles, phasing.
Stakk-aware Advisor + multi-peptide Schedule
In build
03
Dose
Get the math right. Know how long it's good.
Calculator (reconstitution, syringe profiles, shelf-life)
Shipped
04
Run
Take it on time. Log what you actually took.
Schedule (timing, save state, dose logging, adherence)
In build
05
Resupply
Source from vetted suppliers. Don't run out.
Vetted Supplier Directory + Premium Auto-Reorder
In build
06
Review
Bring in a clinician when you want one.
Practitioner Network (async stakk reviews)
In build
Why the integration matters

Layer 01 (Decide) informs Layer 02 (Build). Your Library reading shapes your stakk architecture. Layers 03 (Dose) and 04 (Run) feed Layer 05 (Resupply). Auto-reorder uses your shelf-life and adherence to know days-remaining. Layer 06 (Review) sees Layers 01–05. The practitioner reviews the actual stakk, the actual logged doses, the actual cycle. No competitor connects this many layers. That's the moat.

The category claim

A category of one.

Most peptide tools own one layer. Calculators own Dose. Schedulers own Run. Clinics own Review. Content sites own Decide. PepStakk owns all six — Decide, Build, Dose, Run, Resupply, Review — on a single connected platform. That vertical integration is the category claim, and it's the moat.

What running a stakk looks like

Your stakk, end to end.

Stakk management isn't a feature — it's the whole job. Here's what running a stakk on PepStakk looks like, from the first compound you add to the practitioner review at the end of your first cycle.

01
Decide
Open the Library. Read what the primary research actually says about the peptide you're considering — at the evidence tier you choose. Ask the Advisor what fits your goal.
02
Build
Add the peptide to your stakk. Set the dose. Set the cycle. Add a second peptide phased in at week 4. The Schedule models the architecture; the stakk-aware Advisor flags interactions or redundancies before you commit.
03
Dose
Open the Calculator. Pick reconstitution volume and syringe profile. Get the per-dose mg, the draw line, and the shelf-life on the reconstituted vial. Save the profile.
04
Run
Take your dose. Log it. The Schedule remembers what you logged, not what you scheduled — that's the data that matters when you look back.
05
Resupply
Days-remaining is calculated against your dosing schedule. Pick your supplier from the vetted directory. With Premium auto-reorder (roadmap), supply ships before you stockout.
06
Review
End of cycle: request a written stakk review from a peptide-specialist practitioner. They see your actual stakk, actual adherence, actual cycle. You decide what to keep, what to drop, what to add next.
The spectrum

From your first protocol to your hundredth.

Most platforms pick a tier and lose the other. PepStakk grows with you — same six-layer stack, more depth at each layer as you go.

New Stakkers
"Am I doing this right?"
Plain-language overviews. Guided dosing with clear units. Reminders and simple cycles. Optional practitioner review when you want a second set of eyes. The whole stack, in beginner mode.
  • DecidePlain-language Library overviews
  • BuildSimple cycles, beginner stakk patterns
  • DoseGuided dosing with clear units
  • RunReminders and dose logging
  • ResupplyStarter kits + supplier basics
  • ReviewOptional practitioner check-in
Experienced Stakkers
"Am I doing this efficiently?"
Saved syringe profiles. Cycle and titration tracking. Evidence-tiered summaries. A stakk-aware Advisor that reads your active protocol. Vetted suppliers in one place. The whole stack, on cruise.
  • DecideEvidence-tiered summaries
  • BuildCycle / titration tracking
  • DoseSaved profiles, fast entry
  • RunFull adherence logging
  • ResupplyVetted supplier directory
  • ReviewAsync stakk review
Pro Stakkers
"Can I optimize and stack?"
Multi-compound logic. Phased introduction. Source citations and comparison mode. A conversational Advisor with interaction and redundancy flagging. Async stakk reviews from practitioners who specialize. The whole stack, with the depth turned up.
  • DecideSource citations, comparison mode
  • BuildMulti-protocol, phased introduction
  • DoseMulti-compound logic, edge cases
  • RunFull multi-peptide adherence
  • ResupplyVetted directory + auto-reorder (roadmap)
  • ReviewSpecialist matching by goal
The trust frame

PepStakk knows when to stop talking and bring in a human.

When a question crosses into safety territory, the Advisor routes it to our practitioner network instead of answering directly. That handoff isn't a limitation. It's the trust frame.

In build Practitioner inquiry form is live · Partner network in development
Meet the Stakkers

Built by Stakkers, for Stakkers.

PepStakk is powered by Bar13 Ventures. Three founders, all peptide users, all frustrated by the same gaps — hard to find reliable information, harder to find reputable suppliers, and almost impossible to manage a real stakk without a spreadsheet. So we built what we wished existed.

Ryan Fritz
Ryan Fritz
Co-Founder · CEO, Bar13 Ventures
25+ years in enterprise tech — AWS, SaaS, and digital infrastructure. Uses peptides for metabolic reset, performance, and recovery.
Scott Fritz
Scott Fritz
Co-Founder · COO, Bar13 Ventures
Two decades running a services business end-to-end. Operator's instinct for what actually ships. Uses peptides for weight management and tissue repair.
T.J. Buehler
T.J. Buehler
Co-Founder · CFO, Bar13 Ventures
30 years across financial analysis, wealth management, and capital strategy. Uses peptides for recovery, metabolic health, and longevity optimization.
Read our story
Partner with us

Vetted suppliers. Specialist practitioners.

PepStakk's value depends on the quality of its partner network. If you're a supplier with rigorous standards or a practitioner working in peptide protocols, we want to hear from you.

Suppliers
Apply to the supplier directory.
If you operate a 503A compounding pharmacy, 503B outsourcing facility, or research-grade peptide supply operation, apply to be evaluated against our 100-point rubric across regulatory, quality, sterility, compliance, and operations.
Practitioners
Join the practitioner network.
Licensed practitioners with experience in peptide therapy, longevity, or functional medicine — join our network to provide async stakk reviews and optional consults for informed self-directed users.

Stakk Smart. Stakk Dialed.

Free to start. Premium when you're ready for managed protocol delivery.

No card required · No clinical relationship required · Cancel any time