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Liraglutide (GLP-1 receptor agonist)
An FDA-approved, once-daily GLP-1 receptor agonist (Victoza for type 2 diabetes, Saxenda for chronic weight management). Honest appraisal: a real prescription medicine with genuinely strong large-RCT evidence for glycemic control and moderate weight loss, plus a cardiovascular-outcomes benefit (LEADER). It also carries real risks — a boxed warning for thyroid C-cell tumors, pancreatitis and gallbladder risk, very common GI side effects, and lean-mass loss with weight loss. Included here for reference only; it is NOT a supplement and is not auto-recommended.
Prescription medication — not a dietary supplement
Liraglutide is a prescription (or investigational) drug, not a supplement. It is included here for reference because people research and discuss it (often used off-label) — not as a recommendation. Take it only under a qualified clinician's supervision and only as prescribed; do not source it from grey-market vendors, where identity, purity, and dosing are unverified. The evidence below reflects its clinical trials.
What the evidence says
Most Liraglutide studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2009–2026 with a typical study size of 3,379 participants.
Based on 395 studies · 60 meta-analyses · 327 RCTs · 39,347 total participants
Confidence
High confidenceBy outcome
Scored 'Strong' (7.5) because large phase-3 RCTs and a dedicated outcomes trial consistently prove glycemic, weight, and cardiovascular benefit; not higher because it is a prescription drug with real risks and weaker weight loss than semaglutide.
417 rigorous studies
337 randomized trials · 68 meta-analyses · 53 systematic reviews
Our evidence rating for Liraglutide is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
44 trials ongoing or recruiting · 364 completed on ClinicalTrials.gov
136 of the completed trials have posted results
Registered trials show research momentum for Liraglutide, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Aug 2026
Liraglutide is a once-daily acylated analogue of the gut incretin hormone GLP-1 (glucagon-like peptide-1). It is a prescription drug, NOT a dietary supplement: branded as Victoza (subcutaneous, type 2 diabetes) and Saxenda (subcutaneous 3.0 mg, chronic weight management), and FDA-approved for these indications.
Mechanistically it activates the GLP-1 receptor in the pancreas (glucose-dependent insulin secretion, suppressed glucagon), the brain (appetite suppression and satiety), and the gut (slowed gastric emptying).
The evidence base is one of the stronger ones on this site, anchored by large phase-3 randomized controlled trials.
In type 2 diabetes the LEAD program established efficacy: LEAD-3 Mono (746 patients) showed liraglutide 1.8 mg cut HbA1c by 1.14% vs 0.51% for glimepiride over 52 weeks; LEAD-6 showed it beat exenatide head-to-head on glycemic control.
The landmark LEADER cardiovascular-outcomes trial (9,340 patients with type 2 diabetes at high cardiovascular risk, median 3.8 years) found a significant 13% relative reduction in the composite of cardiovascular death, nonfatal MI, or nonfatal stroke (HR 0.87; 95% CI 0.78-0.97; P=0.01 for superiority), a 22% reduction in cardiovascular death (HR 0.78), and a 15% reduction in all-cause death (HR 0.85).
For weight management, the SCALE Obesity trial (3,731 adults without diabetes) produced a mean 8.4 kg loss vs 2.8 kg on placebo at 56 weeks (−5.6 kg difference), with 63% vs 27% losing ≥5%; SCALE Diabetes confirmed a 6.0% weight loss in people with type 2 diabetes; and in prediabetes a 3-year SCALE trial delayed progression to type 2 diabetes (HR 0.21).
It is effective but, head-to-head, less potent for weight loss than once-weekly semaglutide.
The honest counterweight: liraglutide carries a boxed warning for thyroid C-cell tumors (rodent medullary thyroid carcinoma) and is contraindicated with a personal/family history of medullary thyroid carcinoma or MEN2; it carries risks of pancreatitis and gallbladder disease; gastrointestinal adverse effects (nausea, vomiting, diarrhea) are very common; weight loss includes loss of lean muscle; and the FDA has warned about dosing errors and impurities in compounded/grey-market GLP-1 products.
It should be used only under a clinician's care, for a genuine medical indication — not as a cosmetic shortcut.
A once-daily, albumin-bound analogue of the incretin hormone GLP-1 that binds and activates the GLP-1 receptor in the pancreas, brain, and gastrointestinal tract — the single upstream target driving all downstream effects.
Stimulates insulin release from pancreatic beta cells in a glucose-dependent manner and suppresses glucagon, lowering blood glucose and HbA1c with low intrinsic hypoglycemia risk.
Acts on central appetite-regulating circuits to increase satiety and reduce energy intake — the primary driver of the weight loss seen in the SCALE trials.
Delays gastric emptying, blunting post-meal glucose excursions and prolonging fullness — and the mechanism behind much of the nausea seen in trials.
How Liraglutide works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Contraindicated — boxed warning for thyroid C-cell tumors.
Use with caution under specialist guidance; generally avoid with prior pancreatitis.
Contraindicated — discontinue if pregnancy is detected; weight loss is not advised during pregnancy.
Not appropriate — this is a prescription drug with real risks, not a cosmetic shortcut. Use only for a clinician-confirmed indication.
Combining with insulin or sulfonylureas raises hypoglycemia risk; the clinician typically reduces those agents. Liraglutide alone is low-hypoglycemia (glucose-dependent action).
Delayed gastric emptying can change the absorption of co-administered oral drugs; clinician monitoring advised, especially for narrow-therapeutic-index medicines.
Do not combine with another GLP-1 agonist (e.g. semaglutide, dulaglutide, exenatide, tirzepatide) — additive risk with no added benefit.
Tip: Gradual dose titration; smaller meals; usually transient as the body adapts
Tip: Slow titration, hydration, dietary adjustment; report severe/persistent symptoms to a clinician
Tip: Seek care for upper-right abdominal pain, fever, or jaundice
Tip: Discontinue and seek urgent care for severe, persistent abdominal pain radiating to the back
Tip: Clinician reduces background insulin/sulfonylurea dose; monitor blood glucose
Tip: Resistance training and adequate protein intake during weight loss
Liraglutide has an evidence score of 7.5/10 — strong evidence based on 350 indexed studies, including 3 meta-analyses. An FDA-approved, once-daily GLP-1 receptor agonist (Victoza for type 2 diabetes, Saxenda for chronic weight management). Honest appraisal: a real prescription medicine with genuinely strong large-RCT evidence for glycemic control and moderate weight loss, plus a cardiovascular-outcomes benefit (LEADER). It also carries real risks — a boxed warning for thyroid C-cell tumors, pancreatitis and gallbladder risk, very common GI side effects, and lean-mass loss with weight loss. Included here for reference only; it is NOT a supplement and is not auto-recommended. Representative study: PMID 23163663.
The commonly studied dose of Liraglutide is Prescription-only, clinician-titrated, subcutaneous once daily. Diabetes (Victoza): escalate 0.6 → 1.2 → 1.8 mg/day. Weight management (Saxenda): escalate weekly to 3.0 mg/day. DO NOT self-dose.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Timing is flexible for Liraglutide — consistent daily use matters more than the time of day. Subcutaneous once daily at any time of day, with or without food, ideally at a consistent time.
Liraglutide should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are nausea, vomiting / diarrhea / constipation, gallbladder disease (cholelithiasis / cholecystitis). Use caution if any of these apply to you: Personal or family history of medullary thyroid carcinoma (MTC); Multiple Endocrine Neoplasia syndrome type 2 (MEN2); Prior serious hypersensitivity to liraglutide or any GLP-1 receptor agonist.
Semaglutide
Mostly mechanism / observationalAn FDA-approved GLP-1 receptor agonist (Ozempic/Rybelsus for type 2 diabetes, Wegovy for chronic weight management) with genuinely strong, large-RCT evidence for glycemic control and substantial weight loss, plus a cardiovascular-outcomes benefit. Honest appraisal: this is a real prescription medicine with real efficacy AND real risks — a boxed warning for thyroid C-cell tumors, pancreatitis and gallbladder risk, very common GI side effects, and growing concern about grey-market/compounded versions. It is included here for reference only, not as a supplement and not auto-recommended.
Tirzepatide
Mostly mechanism / observationalAn FDA-approved prescription medication (Mounjaro for type 2 diabetes, Zepbound for obesity and obstructive sleep apnea), not a dietary supplement. Honest appraisal: in head-to-head phase-3 trials it is the most effective approved weight-loss drug to date — up to ~21% body-weight loss over 72 weeks and superior to semaglutide — but it is a real medicine with real risks: a boxed warning for thyroid C-cell tumors, common GI side effects, and pancreatitis/gallbladder signals. Do not source or use it outside a prescription.
Dulaglutide
Mostly mechanism / observationalAn FDA-approved once-weekly GLP-1 receptor agonist (brand Trulicity) for type 2 diabetes, with genuinely strong, large-RCT evidence for lowering HbA1c plus a dedicated cardiovascular-outcomes trial (REWIND) showing a ~12% reduction in major cardiovascular events. Honest appraisal: this is a real prescription medicine with real efficacy AND real risks — a boxed warning for thyroid C-cell tumors, pancreatitis and gallbladder risk, very common GI side effects, and modest (not semaglutide-tier) weight loss. It is included here for reference only, not as a supplement and not auto-recommended.
Orforglipron
Mostly mechanism / observationalAn investigational ORAL, non-peptide small-molecule GLP-1 receptor agonist for obesity and type 2 diabetes — the headline is the convenience of a once-daily pill (no injection, no cold chain, no food/water restrictions) delivering GLP-1-class glycemic and weight benefit. Honest appraisal: the phase-2 data are strong and the first phase-3 read-outs (ATTAIN/ACHIEVE) are promising, but it is INVESTIGATIONAL and not yet approved as a general weight-loss medicine, has the full GLP-1-class side-effect burden (very common dose-dependent nausea/vomiting/diarrhea, higher discontinuation than injectables in some comparisons), and the expected thyroid C-cell class warning and long-term outcomes are unsettled. It is NOT a dietary supplement; listed here for reference only.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 395 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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