GLP-1

Key benefits

What to expect

Based on community reports and published research. Individual results vary significantly.

Dosing protocols

Dosing information is sourced from published research and community protocols. This is not a recommendation. Consult a healthcare professional.

Overview

GLP-1 (Glucagon-Like Peptide-1) is a 30-amino-acid incretin hormone naturally produced by L-cells in the small intestine after eating. It stimulates insulin secretion, suppresses glucagon, slows gastric emptying, and signals satiety to the brain. Native GLP-1 has a half-life of only 2–3 minutes (rapidly degraded by DPP-4 enzyme), which is why pharmaceutical analogs like semaglutide (half-life: 7 days) and tirzepatide were developed. Understanding native GLP-1 biology is essential to understanding the entire GLP-1 agonist class.

How it works

Binds to GLP-1 receptors (GLP-1R) on pancreatic beta cells (stimulating insulin secretion), alpha cells (suppressing glucagon), the vagus nerve and hypothalamus (promoting satiety and reducing appetite), and the gastrointestinal tract (slowing gastric emptying). The glucose-dependent nature of its insulin-stimulating effect means hypoglycaemia risk is low. Central GLP-1R activation in the brain is responsible for the appetite-suppressing effects that make GLP-1 agonists effective for weight loss.

Side effects

Research history

Why analogs were needed

Native GLP-1 is degraded within 2–3 minutes by the DPP-4 enzyme. This makes it impractical as a drug. The breakthrough came with developing DPP-4-resistant analogs: exenatide (from Gila monster venom, 2005), liraglutide (2010), and semaglutide (2017). Each successive generation increased half-life and potency. Semaglutide's 7-day half-life allows weekly dosing, transforming GLP-1 therapy from an inconvenience to a practical treatment.

Natural ways to boost GLP-1

Before considering pharmaceutical analogs, GLP-1 secretion can be enhanced naturally: protein-rich meals increase GLP-1 release; fibre (especially fermentable fibre) promotes L-cell secretion; berberine and bitter compounds stimulate GLP-1; exercise acutely raises GLP-1 levels; and the gut microbiome composition significantly influences GLP-1 production. These approaches produce modest effects compared to pharmaceutical agonists but are relevant for metabolic health optimisation.

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References

1. [1]Drucker DJ. 'The biology of incretin hormones.' Cell Metabolism, 2006.
2. [2]Holst JJ. 'The physiology of glucagon-like peptide 1.' Physiological Reviews, 2007.

Frequently asked questions

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