Your whole stack, modeled.

The only PK tracker that covers your entire protocol in one place. Prescriptions, supplements, peptides, hormones, nootropics. Every compound in your stack, plotted against its own therapeutic range. No account. No Serum cloud. Your tracker data is not sent to us.

Also available as a native app. Free, no account needed.

Serum app showing real-time serum level curves for a daily stack

One broad compound catalog

Serum covers prescriptions, peptides, AAS, psychedelics, and supplements, with model confidence shown per route.

Catch stack conflicts

400+ interactions auto-flagged: absorption blockers, dangerous combos, and nutrient depletions you'd never spot manually.

Zero-trust by design

No account. No analytics. No Serum data server. We do not receive what you take; platform health sync and exports happen only when you enable them.

Grounded in the research

Published studies and labels support the catalog. Each route is labeled as validated, predicted, calibrated, inferred, or unverified.

How it works

1

Build your stack

Pick from 300+ supplements and medications, or add your own compound with custom half-life data.

2

Log your doses

One tap records a dose. Bundle a whole morning stack together and track every ingredient at once.

3

See what's active

Population-based curves estimate absorption, metabolism, and elimination from your logged doses.

4

Dial it in

Compare how timing, dose, and frequency change the projected curve. Reminders help you follow the regimen you entered.

Built for optimizers

Most trackers count pills. Serum adds population-based estimates of release, absorption, metabolism, and elimination after a logged dose.

Absorption & elimination modeling

First-order absorption via the Bateman equation with calibrated absorption rates, elimination rates, and oral bioavailability for each drug. Buspirone at 4%, curcumin at 5%, propranolol at 25%.

Active metabolite cascades

Drugs like fluoxetine, codeine, and amitriptyline produce active metabolites. Serum models the full parent-to-metabolite conversion cascade with independent half-lives.

Prodrug conversion kinetics

Testosterone esters, lisdexamfetamine, simvastatin. Prodrugs are modeled with their conversion mechanics, not just the active form.

Steady-state projections

See where your levels are heading with regular dosing. Tracks time to steady state, peak, and trough. Multiple sources (standalone + bundles) are combined.

Loading suggestions & cycling

Review a model-derived loading suggestion, then configure loading phases, custom frequencies, on/off cycling, and as-needed PRN dosing. Projections adjust accordingly.

Bundles & overlap detection

Track a multivitamin as one dose, and each ingredient gets its own curve. Overlap detection flags when the same compound comes from multiple sources.

570
Drugs & Supplements
1,317
Published Studies
25,909
Drug Interactions
570
PK / PBPK Models
566
Enzyme / Transporter Tags

Your data stays yours

Core tracking works offline. No accounts, Serum cloud sync, analytics, or telemetry. Your regimen, dose history, and settings stay in app or browser storage. The native app excludes them from Android cloud backup; on iOS, it asks the system to exclude them from iCloud Backup.

Android device-to-device setup can transfer local app data. Optional Health Connect and Apple Health integration can sync under your platform settings when you enable it.

No account required No analytics No Serum cloud Export to JSON

Read the full privacy policy →

Log your regimen. Explore the estimate.

Free and works right in your browser. For notifications and health platform sync, install the native app.

Serum is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. Consult a healthcare professional for medical advice, diagnosis, or treatment.

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