Peptide Library
Free
$0
Research, compare, and calculate on the web.
- Browse the peptide library
- Compare vendor offers and $/mg
- Vendor ratings and review counts
- Single-peptide calculator
- Inventory for 1 peptide
- Up to 2 containers per item
Independent peptide research platform
Peptide calculator, tracker & research library.
Precision in every calculation. Clarity in every discovery.
Peptide Library is a free peptide calculator on the web and Android, a peptide tracker for schedules, reminders and inventory on iPhone, Android and the web, and a research library of 208 peptide profiles with their human evidence and vendor prices. It does not sell peptides.
Calculator: free, in your browser, no account.Get the app →Research Intelligence →
Research platform onlyPeptide Library does not sell peptidesBuilt for research use only. Not for human consumption.
Calculate
Precision made simple.
The Peptide Library peptide calculator works out reconstitution, concentration, syringe units and cost free in any browser, with no account, and in the Android app; blends are part of Pro. Every peptide profile opens it with that peptide’s vial size filled in.
Concentration
Livemg
mL
Result
2.5 mg/mL
= 2,500 mcg/mL
Unit arithmetic for research use, not a recommendation of any amount.
Open the full calculator- Reconstitution
- Vial amount and the diluent you add give the concentration in mg/mL.
- Measuring
- An amount in mcg or mg gives the volume, the U-100 syringe marking and how many uses the vial holds.
- Blends and cost
- Cost per mg and per use for free; two or more peptides in one vial at a shared volume with Pro.
Track
Everything organized. Nothing overlooked.
The Peptide Library peptide tracker keeps schedules, reminders, logs, inventory, journal and body metrics together, on iPhone, Android and the web, with one account.
01
Today, at a glance.
Each day opens on what is scheduled, what is done and what is next, with your streak and one tap to log.02
Log it in one tap.
Confirm a scheduled entry and the amount, volume and vial come from your schedule and inventory. Reminders arrive on iPhone, Android and, with web push, in the browser.
03
Inventory that counts itself down.
Every log takes from the right vial or container, so uses left, run-out dates and reorder alerts stay current.
04
Progress, on the record.
Weight, body fat and estimated lean mass with their trends, next to journal check-ins and progress photos. Pro syncs all of it across your devices.
Research
Explore the evidence. Not just the claims.
The Research Intelligence Center counts the published science behind every peptide: PubMed publications and ClinicalTrials.gov registrations, classified by study type and evidence class, the same way every time, with the method and the data open to check.
- Peptide publications analyzed
- 64,887
- Share of publications that are human clinical research
- 37.8%
- Registered clinical trials
- 4,968
Automated weekly refresh (not editorially reviewed) · data through November 1, 2026 · version weekly-2026-11-01
State of Peptide Research 2026
How peptide research has grown, and where human evidence is thin.
Human evidence quality
Automated risk-of-bias and certainty ratings for human studies, labelled as automated, with their limits stated.
Research dashboard
Publications and clinical trials by peptide, study type and evidence class.
Open datasets
The data behind every chart as CSV, JSON or XLSX, licensed CC BY 4.0.
Library
208 profiles.
One searchable library.
Structured peptide profiles with research information, identifiers, references, regulatory context and vendor comparison.
Or browse the full library by category.
Peptide price comparison
Compare the market.
Not just the sticker price.
Compare peptide prices across vendors by price per mg, with ratings and availability in one place. A cheaper vial is not a cheaper milligram.
Live offers for DSIP. Select a column heading to sort.
Compare every peptide →| Vial | Availability | ||||
|---|---|---|---|---|---|
| Royal PeptidesBest $/mg | 10mg | $297.50 | $2.98 | No reviews | In stock |
| Amino Club | 15mg | $59.99 | $4.00 | 5.0 (1) | In stock |
| ModFit Supps | 2mg | $80.00 | $4.00 | No reviews | In stock |
| Glacier Aminos | 10mg | $401.93 | $4.02 | No reviews | In stock |
| Solution Peptides | 10mg | $405.00 | $4.05 | No reviews | In stock |
| Atomik Labz | 10mg | $405.00 | $4.05 | No reviews | In stock |
| Particle Peptides | 10mg | EUR 40.64 | $4.06 | No reviews | In stock |
| Peptide Titans | 10mg | $44.99 | $4.50 | 5.0 (10) | Out of stock |
Sorted by price per mg, lowest first. Not a paid advertising ranking — coupons or affiliate links do not change the order. How rankings work
Methodology
Know where the data comes from.
Every profile is assembled from published literature and public registries, cited against its source and dated when it was last reviewed.
01
Published research
Profiles are built from peer-reviewed literature, with citations recorded against PubMed identifiers and DOIs rather than summarised second-hand.
- PubMed
- DOI
- Peer-reviewed
02
Regulatory and registry data
Chemical identity and regulatory context come from public chemical registries and regulator records, so identifiers can be checked against their source.
- PubChem
- ChEMBL
- CAS
- UNII
03
Verified references
Citations are audited, profiles carry a review date, and corrections are versioned — so a profile states when it was last checked, not just what it says.
- Citation audit
- Review dates
- Versioning
Read the full methodology →Editorial policy →How rankings work →
Platforms
One account. Every screen you use.
Peptide Library runs on iPhone, Android and the web with one account, and Pro syncs everything between them. Here is exactly what each platform includes today.
| Feature | iPhone | Android | Web |
|---|---|---|---|
| Peptide calculatoriPhone: Not in the App Store app; works in Safari and the web app on iPhone. Web: Free, no account needed. | Partly | Yes | Yes |
| Research library and Compare | Yes | Yes | Yes |
| Schedules, calendar and remindersWeb: Reminders need a browser with Web Push. | Yes | Yes | Yes |
| Inventory with run-out dates | Yes | Yes | Yes |
| Journal check-ins | Yes | Yes | Yes |
| Body metrics and progress photosiPhone: Imports from Apple Health. Android: Imports from Health Connect. Web: Metrics on every plan; photos only with Pro photo backup; health connections are made in the app. | Yes | Yes | Partly |
| Home Screen widgetsAndroid: Android has no widgets yet. | Yes | No | No |
| Vendor price comparison | Yes | Yes | Yes |
Pricing
Start free. Go Pro when you need more.
Comparison, vendors, and the library stay free. Pro unlocks sync, unlimited inventory, and advanced tools in the app.
Peptide Library Pro
$4.99 / month
$39.99 yearly or $89.99 lifetime.
- Unlimited inventory
- Cloud sync and backup
- Blend calculator
- Courses and community Q&A
- Data export and advanced tracking
- Progress photos and research dashboard
Get Pro in the app
Subscriptions are purchased and managed in the mobile apps.
FAQ
Questions, answered.
“Pinning” is informal slang for administering a substance with a needle and syringe. In peptide discussions it almost always means a subcutaneous or intramuscular injection, as opposed to an oral, nasal, or topical route.
The term comes from community forums rather than clinical literature — it will not appear in a published study or on a product label. It describes only the act of injecting, and carries no information about what is being administered, at what dose, or for what purpose.
Related terms you will see alongside it
- Subq / sub-Q / SC — subcutaneous, into the fat layer beneath the skin. See What is subcutaneous administration?
- IM — intramuscular, into muscle tissue. See What is intramuscular administration?
- Slin pin — an insulin syringe, typically U-100, graduated in units rather than millilitres
- Gauge — needle thickness, where a higher gauge number means a thinner needle
- Recon / reconstitute — dissolving a freeze-dried powder into liquid before it can be drawn. See What does “reconstitution” mean?
- BAC water — bacteriostatic water, the diluent most often used for reconstitution
Why the route comes up so often
Most peptides are not orally active: stomach acid and digestive enzymes break the peptide bonds before absorption, which is why injection dominates the discussion. Why are most peptides not orally active? explains the mechanism.
A dose is expressed as a mass in milligrams or micrograms but drawn as a volume, and the two are linked by the concentration of the reconstituted vial. The reconstitution calculator converts between them.
Peptide Library documents this terminology for research literacy. Nothing here is instruction in injection technique, and none of it is medical advice.
Reconstitution is the process of adding a liquid (commonly bacteriostatic water) to a lyophilized (freeze-dried) peptide powder to prepare it for research use.
Peptides are shipped as dry powder for stability and must be reconstituted before use.
Yes. Your tracker, metrics, and journal data are private to your account and are not shared publicly.
GLP-1 receptor agonists are compounds that activate the GLP-1 (glucagon-like peptide-1) receptor, which is involved in glucose regulation and appetite signalling.
In research literature, GLP-1 activity is associated with:
- Increased glucose-dependent insulin secretion
- Reduced glucagon secretion, context-dependent
- Slower gastric emptying
- Changes in appetite and satiety signalling
Why "agonist" and not "GLP-1"
Native GLP-1 is useless as a drug: DPP-4 degrades it within roughly two minutes of release. Every clinically useful compound in this class is therefore an analog engineered to survive that enzyme — and often to bind albumin as well, pushing the half-life from minutes to days.
That engineering is what separates the generations. Early agonists required twice-daily administration; later ones with albumin-binding modifications moved to weekly.
Glucose-dependent is the key phrase
The insulin effect scales with blood glucose rather than firing regardless of it. That dependency is why the mechanism behaves differently from insulin itself.
Beyond GLP-1 alone
Newer compounds add other receptors — GIP, or GIP plus glucagon. See how the three receptors differ and the GLP-1 and metabolic category.
Research use only. Not medical advice.
Peptides can degrade over time. “Expiration” typically refers to the point where a compound may no longer meet a stated purity or stability expectation.
Researchers often track:
- Lot/batch identifiers
- Storage conditions (temperature, light, moisture)
- Dates and documentation (COAs)
Always follow vendor guidance and lab best practices.
Vendor ratings are based on:
- User reviews
- Verified purchase submissions (when available)
- Transparency indicators (COAs, lab reports)
- Shipping reliability
- Community feedback
Peptide Library may use a combination of:
- Publicly available vendor listings
- Automated collection where permitted
- Manual verification and user-submitted corrections
Because vendor catalogs change frequently, always confirm final details on the vendor’s website.
Price per mg is calculated using:
Total Price ÷ Total Milligrams = $/mg
This allows you to objectively compare different vial sizes, blends, and vendors on equal footing.
One research platform
Research smarter.
Stay organized.
A free peptide calculator, a tracker for every device and the research behind each peptide, in one platform.
Peptide Library is an independent research platform and does not sell peptides. Content is for research and educational purposes only and is not medical advice.