Oral peptide as a tag (singular form) covers the same field as #oral-peptides — the formulation chemistry that makes peptide drugs survive the gut and cross the intestinal epithelium at therapeutic dose.
Key programs: oral semaglutide and oral Wegovy (SNAC-based salt-permeation enhancers), Vivtex's permeability platforms, J&J's oral icotrokinra in plaque psoriasis, and the small-molecule oral alternatives (orforglipron / Foundayo) that bypass peptide-bioavailability constraints.
Stories here cover platform readouts and the deals around them. See #oral-peptides and #drug-delivery for related threads.
Entera Bio reported Q1 2026 May 8 with $20.4M cash and an updated Phase 3 plan for EB613, an oral once-daily PTH(1-34) tablet that would be the first oral osteoanabolic for postmenopausal osteoporosis. The streamlined Phase 3 protocol — submitted to the FDA in March — covers 750 postmenopausal women with primary endpoint of total hip BMD change from baseline at month 12. Trial initiation is targeted for late 2026, with topline H2 2028 — roughly one year earlier than previously guided. The molecule applies Entera's N-Tab oral peptide platform to teriparatide, the active ingredient in Forteo. The Phase 2 dose-ranging study in 161 patients met primary (PD/bone-turnover biomarker) and secondary (BMD) endpoints.
Joelle Pelletier's perspective in Science (volume 392, pages 582-583, published online May 8) accompanies the Merck enlicitide biocatalytic synthesis paper and frames the enzyme-cascade route — engineered enzymes plus chromatography-free crystallization to cut step count by more than half — as a template that goes well beyond enlicitide. The piece argues that the limiting step for oral macrocyclic peptide therapeutics has been the manufacturing cost of multi-step protected-residue chemistry, not pharmacology or pharmacokinetics; biocatalysis collapses the cost curve and unlocks a pipeline of oral peptides at large molecular weights that have been quietly stuck in preclinical or Phase 1 economics. The framing matters as enlicitide (oral PCSK9 inhibitor with 57% LDL-C reduction at 24 weeks) heads toward NDA filing.
TIDES USA 2026 opens in Boston May 11-14 with a featured presentation on Chugai's LUNA18 (paluratide), an N-alkyl-rich cyclic undecapeptide oral KRAS inhibitor. The corresponding paper in Organic Process Research & Development describes a convergent 24-step liquid-phase synthesis route delivering kilogram-scale GMP material at >98.5% purity and >30% overall yield. LUNA18 binds KRAS, NRAS, and HRAS mutants plus wildtype, inhibiting the inactive-state RAS-GEF protein-protein interaction; it achieves 21-47% oral bioavailability without special formulation. The molecule is in Phase 1 monotherapy and combination-with-cetuximab dose escalation. LUNA18's chemistry is a milestone for the oral-cyclic-peptide-against-intracellular-targets thesis that Bicycle Therapeutics, Circle Pharma, and Unnatural Products are advancing through different platform architectures.
Merck scientists published in Science a convergent biocatalytic synthesis of enlicitide decanoate, an investigational oral PCSK9 inhibitor and macrocyclic peptide. A tailored suite of engineered enzymes catalyzes selective peptide fragment formation, coupling, and macrocyclization in a protecting-group-free sequence; combined with chromatography-free crystallizations, the route reduces step count by more than half versus prior state-of-the-art methods. Enlicitide is in Phase 3 (CORALreef, with –55.8% LDL-C reported earlier in 2026) and would be the first oral PCSK9 inhibitor if approved. The paper matters beyond enlicitide: protein-engineering-led cascades shift the cost basis for any large macrocyclic peptide program facing peptide-CDMO bottlenecks.
OrbiMed-incubated Pinnacle Medicines is featured at the Boston peptide summit highlighting its oversubscribed $89M Series B financing (closed March 26) for advancing oral peptide therapeutics designed to match the efficacy of injectable biologics. Lead programs target asthma, COPD, immunology, and inflammation — distinct from the GLP-1 obesity focus dominating peptide headlines. The platform combines proprietary peptide stabilization with oral-bioavailability engineering, positioning Pinnacle as one of the most differentiated non-GLP-1 oral peptide developers in the current pipeline.
Merck's investigational oral macrocyclic peptide PCSK9 inhibitor demonstrated significantly greater LDL-C reductions at 8 weeks vs guideline-recommended oral non-statin therapies, delivering injectable-level cholesterol lowering in pill form.
Oral peptide icotrokinra delivered complete skin clearance through week 52 with a strong safety profile in the ICONIC-ADVANCE trials, presented at the American Academy of Dermatology meeting.