The complete history of GLP-1 drugs — from 1902 incretin research to exenatide (2005), Victoza (2010), Ozempic (2017), Rybelsus (2019), Wegovy (2021), Mounjaro (2022), Zepbound (2023), and pipeline candidates retatrutide and orforglipron — with where PlexusDx Semaglutide, Tirzepatide, Microdose, and GLP-Squared protocols fit in 2026.

GLP-3 retatrutide explained: triple-agonist mechanism, Phase 3 TRIUMPH data, dysesthesia signal, FDA timeline, and how PlexusDx’s currently-available compounded semaglutide and tirzepatide protocols compare to the pipeline asset.

Retatrutide (Lilly's investigational triple agonist) and orforglipron (Lilly's oral non-peptide GLP-1) are the two big pipeline stories in 2026 — but neither is FDA-approved yet. Here's the realistic timeline, the Phase 3 data, the announced and unknown pricing, and how PlexusDx's currently-available compounded semaglutide and tirzepatide protocols ($129/mo to $349/mo) compare for someone who needs an option today rather than in 2028.

Retatrutide access as of April 2026: this article covers the legitimate prescribing pathway, how telehealth evaluation works, red flags for unauthorized sellers, compounded alternatives through licensed 503A pharmacies, and PlexusDx Weight Management Protocols with provider evaluation included.

Tirzepatide and Retatrutide are widely compared GLP-1 pathway compounds. This head-to-head covers mechanism, FDA status, trial evidence, boxed-warning safety, April 2026 list pricing, and the FTO, MC4R, and TCF7L2 variants that shape baseline GLP-1 biology.

Retatrutide is an investigational triple-agonist from Eli Lilly with no FDA-approved brand name. This guide explains why no brand exists yet, how the compound is designed to work, the conditions being studied in trials, and why any site selling it should raise concern.

There is no FDA-approved "GLP-3" as of April 2026. Searches for it usually reflect interest in triple-agonist investigational compounds (retatrutide) or confusion with dual-agonist tirzepatide. This article explains what is real and the GLP-1 pathway genetics.

Retatrutide and tirzepatide are compared across mechanism, FDA-approved indications, evidence base, side effects, cost, and the pathway-level genetic variants — including GIPR and FTO — that apply regardless of which compound is prescribed.

Retatrutide (retatrutide, Eli Lilly) is a GLP-1 receptor agonist with a well-characterized safety profile. This article covers common side effects, serious warnings, the boxed-warning context, and when to call a provider — plus the genetic variables that shape baseline GLP-1 biology.

Retatrutide has no FDA label and no approved dose because it is still investigational and in clinical trials. Any online dosing plan is unofficial and unsafe to follow. This article explains how approved dosing is set and what regulated GLP-1 options a provider can discuss.