This one is worth a read. A new 2026 Nature Metabolism study looked specifically at cagrilintide + retatrutide and found some interesting synergy beyond what you might expect from simply stacking appetite suppression.
Study setup:
Obese male rats were given Cagri, Reta, or the combination. The researchers also compared Cagri + Reta against Cagri + semaglutide and Cagri + tirzepatide.
Core protocol:
• Cagri: 5 nmol/kg/day
• Reta: 5 nmol/kg/day
• Subcutaneous administration
• Approximately 2 weeks depending on the experiment
• Additional dose-response testing from 0.3–30 nmol/kg
Results:
Cagri + Reta produced greater reductions in body weight and food intake than either compound alone at matched molar doses.
But the pair-fed experiment is what really caught my attention.
Researchers included animals restricted to the same food intake as the Cagri + Reta group, along with calorie-restricted animals used to separate the effects of reduced intake and weight loss from the pharmacology itself.
The combination still produced metabolic and molecular changes that weren't completely explained by eating less.
That's interesting because Cagri often gets viewed simply as an additional appetite suppressant alongside Reta.
Mechanistically, you're combining:
Reta → GLP-1 + GIP + glucagon receptor activity
Cagri → amylin-receptor activity
Together, researchers observed changes involving central energy-balance pathways and peripheral bioenergetic/metabolic pathways, along with improvements in markers including insulin, triglycerides and total cholesterol.
The study also found the Cagri + Reta combination produced stronger weight-loss effects than the Cagri + semaglutide and Cagri + tirzepatide combinations tested.
Big takeaway for me:
Cagri + Reta may be considerably more interesting than simply “Reta with extra appetite suppression.” The pair-fed data suggest complementary metabolic effects that extend beyond calorie reduction alone.
Study: Cagrilintide and retatrutide combination therapy enhances weight loss and metabolic outcomes in obese male rats — Nature Metabolism, 2026.
That pair-fed experiment is the part I'd really like to hear everyone's thoughts on. As well as the possibility of using it alongside reta to achieve results quicker and with more price efficiency.
had ChatGPT summarize this.
Why I had chat summarize: #1 being time of course... as well as having just purchased Cag to stack in with reta. In my endeavours I experienced a run in with a fellow researcher claiming adding cag and lowering reta was a profoundly stupid idea. 2 days later this study is dropped and proves that it may indeed be worth researching as it has not only showed greater results when combined it also will help to limit my expenditures on Reta.
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