Know BEFORE
you inject.
Real data on peptide side effects, benefits, and what to expect week by week. FDA clinical data plus community experiences — so you know if what you're feeling is normal.
"Is this normal?"
Every peptide user asks the same question. The nausea on week 1 of tirzepatide. The vivid dreams on BPC-157. The sulfur burps nobody warned you about. You search Reddit, scroll through contradicting anecdotes, and still don't know if what you're experiencing is typical or a red flag.
PepEffect answers that question with structured data — not guesswork.
The FDA label says 3%.
Real users say 45%.
On tirzepatide, eructation appears at 3% in the prescribing information. Community reports put "sulfur burps" closer to 45%. That's not the FDA being wrong — it's the gap between a clinical trial and daily life. PepEffect shows you both, clearly labeled, side by side.
Sulfur burps
FDA label
3%
Community
45%
Eructation on FDA label vs. community reports
Food aversions
FDA label
Not listed
Community
38%
Common community complaint during titration
Hair thinning
FDA label
Postmarketing
Community
12%
Usually caloric deficit, not the drug itself
Five features. One clear purpose.
Week-by-Week Timeline
See how side effects and benefits change over time for every compound. Know what's coming before it hits.
Clinical + Community Data
FDA prescribing information alongside real community-reported effects. Two layers of truth, clearly labeled.
Daily Check-ins
Log your experience and compare to community benchmarks. Track severity trends. Export to CSV.
Compare Tool
Side-by-side comparison of any two peptides — effects, benefits, and timelines in one view.
50+ Real Stories
Published experiences from clinical trials, patient interviews, and medical case reports. Not anonymous Reddit posts.
Privacy First
Your data never leaves your device. No accounts. No tracking. No analytics. No ads. Period.
The peptides people actually use
One price. Yours forever.
No subscriptions. No recurring charges. No "premium tiers."
Free
Research and learn
$0
- ✓ Full peptide library with write-ups
- ✓ FDA-documented side effects
- ✓ Top 3 community effects
- ✓ 1 story per compound
- ✓ Week 1 timeline preview
Premium
The full experience
$9.99
one-time purchase
- ✓ Everything in Free
- ✓ Full week-by-week timelines
- ✓ All community effects + trends
- ✓ Daily check-ins + benchmarking
- ✓ Side-by-side compare tool
- ✓ 50+ real published stories
- ✓ CSV export
Give your patients a side-effect companion
GLP-1 patients ask the same questions every week. "Is this normal? How long does the nausea last? When does food noise come back?" PepEffect answers with structured week-by-week data — so your patients arrive at the next visit informed instead of anxious.
Patient adherence
Week-by-week expectations reduce the "I quit because nobody warned me about week 3" drop-off.
Fewer off-hours calls
Patients can compare what they're feeling to community benchmarks before paging your front desk.
Zero PHI
Everything stays on the patient's device. No accounts, no servers, no data-processing agreements to sign.
Or email dave@stackcurious.com directly
Your data stays on your device
PepEffect has zero analytics, zero tracking SDKs, zero data collection. Your check-ins, your protocol, your notes — stored locally on your iPhone and nowhere else. We don't even have servers.
PepEffect provides general wellness information for educational purposes only. It does not provide medical advice, diagnosis, or treatment recommendations. All community data is user-reported and not clinically validated. Always consult a qualified healthcare provider before starting, changing, or stopping any peptide protocol or medication.