News
Peptide research roundup. Sources are public studies, regulatory filings, and industry announcements.
- FDA4/22/2026FDA compounding ban update — what tirzepatide users should know
Compounded tirzepatide is being phased out as Lilly's supply normalizes. Pricing and availability through compounding pharmacies will keep tightening through Q3. If you've been on compounded tirz, plan a transition to Mounjaro/Zepbound coverage or to tirzepatide research-grade through your existing channels.
- Pepdex desk4/18/2026Retatrutide research-grade pricing keeps dropping — current snapshot
Per-mg pricing on research-grade reta has fallen ~40% since late 2025 as more vendors stock it ahead of the regulatory submission. If you're on reta, you're likely paying less per cycle now than 6 months ago. Check the welcome-email vendor list for current rates.
- Pepdex Q&A4/15/2026The sulfur-burps problem on semaglutide — what users actually do about it
Most-asked support ticket lately. Three things help: (1) drop a titration step, (2) eat smaller meals lower in fat, (3) try a digestive bitters supplement before meals. The burps fade for most users by week 6-8 if you push through.
- Pepdex Guides4/12/2026Refrigerator vs freezer storage — beginner's quick guide
Lyophilized (powder) peptides go in the freezer for long-term, fridge for short-term. Reconstituted (mixed) peptides go in the fridge only — never freeze them once water's been added. The Storage guide has the per-peptide stability windows.
- Pepdex desk4/8/2026BPC-157 oral vs injectable — what the data actually says
Oral BPC-157 has good data for gut applications (the original use case). For tendon and ligament healing, injectable near the injury site outperforms oral by a wide margin in animal models and user reports. Pick the route that matches your goal.
- Novo Nordisk3/28/2026CagriSema (Cagrilintide + Semaglutide) — Phase 3 readout summary
Phase 3 readouts continue to support the combination over semaglutide alone for users plateaued on GLP-1 monotherapy. Effect size is meaningful but not Tirzepatide-tier. Worth knowing if you've stalled on Wegovy.
- Pepdex Q&A3/22/2026Reducing nausea on retatrutide titration — what works
Three patterns from members: (1) inject in the evening so you sleep through the worst of it, (2) hold each titration step for 5 weeks instead of 4 if nausea is severe, (3) eat protein and electrolytes — undereating protein makes the fatigue feel like everything else.