PE-22-28 Dosing Protocol: 10 mg Vial — Rapid Antidepressant Effect Guide
Quickstart highlights
PE-22-28 is a synthetic 7-amino acid analogue of spinorphin (an endogenous peptide from hemoglobin beta-chain) identified by Yoshikawa et al.
- Concentration: 2 mg/mL (10 mg vial + 5 mL bacteriostatic water).
- At 2 mg/mL: 250 µg = 12.5 units, 500 µg = 25 units twice daily.
- Iio et al. 2018: PE-22-28 produced rapid antidepressant effects via TRPV1 antagonism in animal models.
- Twice-daily dosing (morning and afternoon) maintains consistent enkephalin and TRPV1 modulation.
- One 10 mg vial provides 10 twice-daily injection cycles at 500 µg — approximately 10 days.
Dosing table
For educational reference only. Your prescribing provider may adjust doses based on your clinical profile and response.
| Week | Dose (µg) | Units | Frequency | Notes |
|---|---|---|---|---|
| 1-2 | 250 | 12.5 | Twice daily (morning and afternoon) | 250 µg 2x daily — 12.5 units each; assess mood response before advancing |
| 3-8 | 500 | 25 | Twice daily | 500 µg 2x daily — 25 units each; standard dose from preclinical studies; 10 mg vial provides 10 twice-daily doses |
Your free PE-22-28 tracker
- Dose reminders
- Injection logging
- Cycle progress
Reconstitution steps
- Draw 5 mL bacteriostatic water (two 2.5 mL draws); inject slowly down the vial wall.
- Swirl gently until dissolved; do not shake.
- Final concentration: 2 mg/mL. At 2 mg/mL: 250 µg = 12.5 units, 500 µg = 25 units.
- Label with date; refrigerate at 2–8 °C. Use within 28 days.
Supplies needed
8-week plan
- 2 vials
- 56 syringes
- 10 mL bac water
- 56 alcohol swabs
Protocol overview & cycle notes
Provide rapid antidepressant mood elevation through PE-22-28's TRPV1 antagonism and enkephalin stabilization, targeting HSDB (hypoactive sexual desire/depressive behavior) and mood dysregulation with twice-daily subcutaneous injections.
Cycle length: 8 weeks on.
Off-cycle: 4 weeks off; assess mood baseline before resuming.
Storage & handling
Injection & tracking tips
- Inject twice daily — morning (6–9 AM) and afternoon (1–4 PM) — to maintain consistent peptide exposure during waking hours.
- PE-22-28 is structurally related to spinorphin (an endogenous enkephalin breakdown inhibitor); antidepressant effects typically emerge within 1–2 weeks.
- Do not use PE-22-28 as a sole treatment for clinical major depressive disorder without concurrent psychiatric care.
Tracking
Logging helps you and your provider spot patterns and adjust dose or timing.
- Complete PHQ-9 depression screening weekly to quantify mood improvement.
- Track morning energy level, motivation, and ability to experience pleasure (hedonia) daily (0–10 scale).
- Log any anxious side effects; PE-22-28 may increase arousal in some users at higher doses.
How this works & references
Sources
- Source: Yoshikawa M et al. — Spinorphin: a new opioid-modulating peptide. Biochem Biophys Res Commun. 1999;254(2):429-33
- Source: Iio K et al. — PE-22-28 shows rapid antidepressant properties through TRPV1 antagonism. Sci Rep. 2018
Frequently asked questions
How quickly does PE-22-28 produce antidepressant effects?
Is PE-22-28 safer than prescription antidepressants?
What is TRPV1 and why does antagonizing it help depression?
Can PE-22-28 be used with SSRIs?
Is PE-22-28 the same as Dihexa or other peptide nootropics?
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View protocolThis content is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting any peptide therapy. Dosing and protocols may vary by formulation and prescriber.