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Weight Care Edit
Compound

Semaglutide: how it works and the products that contain it

Weight Care Edit

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The short answer

Semaglutide copies GLP-1, a hormone your gut releases after eating. It stimulates insulin and reduces glucagon in a glucose-dependent manner, delays gastric emptying and reduces calorie intake, likely through appetite effects. Low blood sugar can still occur, particularly with insulin or insulin secretagogues. It is sold as Ozempic and Rybelsus for diabetes and as Wegovy for weight.

Definition

Semaglutide is a GLP-1 receptor agonist used as the active ingredient in Novo Nordisk’s approved formulations. It is the active ingredient in Ozempic and in the Rybelsus and Ozempic tablets (type 2 diabetes), and in Wegovy injection and Wegovy tablets (weight management and heart-risk reduction).

Key facts

Key facts: Semaglutide
FactDetail
Drug classGLP-1 receptor agonist, 94% similar in sequence to human GLP-1
MakerNovo Nordisk
First approvalOzempic, December 5, 2017[5]
FormsWeekly injection; daily tablet
BrandsOzempic, Ozempic tablets, Rybelsus (being phased out), Wegovy injection, Wegovy tablets
GenericANDA 220314 has tentative approval, which is not permission to market[6]
CompoundedNot FDA-approved; shortage over February 21, 2025[10]
Brand self-payWegovy pen $349 a month, pill $149 to $299 (NovoCare)[12]
Compounded, online$75–$349 a month
PrescriptionRequired

Ask what semaglutide is and you'll get a brand name back: Ozempic, Wegovy, Rybelsus. They're all the same molecule, made by Novo Nordisk, in different doses, devices and labels. This page is about the molecule itself: how it works, what it has done in trials, and how the products differ.

Semaglutide works by copying a gut hormone

Semaglutide copies GLP-1, a hormone your gut makes after meals. The label describes it as a GLP-1 analog with 94% sequence similarity to the human hormone that “selectively binds to and activates the GLP-1 receptor” [3]. Natural GLP-1 lasts minutes in the blood. Semaglutide binds to albumin, a blood protein, and resists the enzyme that breaks GLP-1 down, and its elimination half-life is approximately one week. The labeled schedule still depends on the formulation: weekly injection or daily tablet.

  1. Glucose-dependent insulin effects. It raises insulin and lowers glucagon “in a glucose-dependent manner,” so the effect is strongest when blood sugar is high [4].
  2. Slower stomach emptying. Food leaves the stomach more slowly, so sugar enters the blood more gradually after meals.
  3. Less appetite. GLP-1 receptors sit in brain areas that regulate appetite, and in animal studies semaglutide reached and activated those areas [3].
  4. Fewer calories. The net result, in the label's words: semaglutide “decreases calorie intake.”

These mechanisms help explain glucose and weight effects; they are not a complete causal account of every clinical benefit or adverse reaction. Ozempic and Wegovy have distinct indications, and sharing a molecule does not make their formulations or doses interchangeable.

One molecule, several approved formulations

Semaglutide is the ingredient. Ozempic and Wegovy are two products made from it, with different labels, doses and devices, and the same goes for the tablets. Is semaglutide the same as Ozempic? Same drug, yes. Same product, no.

Selected semaglutide formulations and their labeled uses
ProductFormApproved forFirst approved
OzempicWeekly pen or prefilled syringeAdults with type 2 diabetes: blood sugar; cardiovascular risk with established cardiovascular disease; kidney outcomes with chronic kidney diseaseDecember 5, 2017
RybelsusDaily tabletType 2 diabetes: blood sugar, heart risk in high-risk adultsSeptember 20, 2019; listed “To Be Discontinued” June 4, 2026 [7]
Ozempic tabletsDaily tablet (newer Rybelsus formulation)Same as RybelsusRenamed January 30, 2026 [8]
Wegovy injectionWeekly pen, syringe or FlexTouch; 7.2 mg HD penWeight: adults with qualifying obesity/overweight and ages 12+ with obesity; cardiovascular risk in adults with established cardiovascular disease and obesity/overweight; adult noncirrhotic MASH/F2–F3 (accelerated)June 4, 2021; 7.2 mg added March 19, 2026
Wegovy tabletsDaily tabletWeight and heart-risk reduction in adultsDecember 22, 2025 [9]
Compounded semaglutidePharmacy-madeNot FDA-approvedNever approved

Approval dates from Drugs@FDA and FDA approval letters. Rybelsus and Ozempic tablets are “not substitutable on a mg-to-mg basis,” per their label.

Is semaglutide the same as Wegovy? Again, same drug, different product. Wegovy’s injection label has a 7.2 mg option for selected adults needing additional weight reduction; that dose is not the regimen for every indication or pediatric patient. Ozempic injection has a different dose range and indications. The tablets have their own guide, our page on oral semaglutide.

Which semaglutide product is right for you? That's a label question first. Type 2 diabetes points to Ozempic or the tablets. Weight management or heart-risk reduction without diabetes points to Wegovy. A preference for a pill over a shot narrows it further. Our Ozempic vs Wegovy comparison sets the two injections side by side.

Approved uses depend on formulation, diagnosis and population

The indication belongs to the exact product. Ozempic injection’s three indications concern adults with type 2 diabetes, with established cardiovascular disease or chronic kidney disease required for the respective risk-reduction uses. Wegovy’s weight and cardiovascular indications have their own age, BMI and disease criteria. Its noncirrhotic MASH indication applies to adults with F2–F3 fibrosis and to the injection only; it does not require obesity or overweight [4] [3].

Which brand carries which approved use
Approved useBrandTrial behind it
Blood sugar in adults with type 2 diabetesOzempic; Rybelsus and Ozempic tabletsSUSTAIN and PIONEER programs
Cardiovascular event risk in adults with type 2 diabetes: established CVD for injection, high risk for tabletsOzempic; Rybelsus and Ozempic tabletsSUSTAIN-6 [19]; SOUL for the tablets [2] [1]
Slower kidney decline in type 2 diabetes with kidney diseaseOzempicFLOW [17]
Weight reduction and maintenance with qualifying obesity or overweightWegovy injection (adults; ages 12+ with obesity); Wegovy tablets (adults)STEP 1 [14]; OASIS 4 [20]
Cardiovascular event risk in adults with established CVD and obesity or overweightWegovy injection and tabletsSELECT [16]
Noncirrhotic MASH with moderate to advanced F2–F3 liver fibrosis in adultsWegovy injection (accelerated approval)ESSENCE [18]

Can you take semaglutide without diabetes? Yes, as Wegovy, which is labeled for people with or without diabetes. Ozempic's label is type 2 diabetes only, so using it for weight alone is off-label.

Trials studied weight, cardiovascular and kidney outcomes, and liver histology

In STEP 1, adults without diabetes on semaglutide 2.4 mg a week lost 14.9% of their weight over 68 weeks, against 2.4% on placebo, and half lost 15% or more [14]. In SELECT, 17,604 adults aged 45 or older with established cardiovascular disease, BMI 27 or higher and no diabetes had first composite cardiovascular events in 6.5% versus 8.0%. The HR 0.80 (95% CI 0.72–0.90) represents a 20% relative reduction in event hazard, not 20 percentage points [16].

Average weight change in semaglutide's main weight trials (separate trials)
Injection 2.4 mg, 68 weeks (STEP 1)
-14.9%[14]
Placebo (STEP 1)
-2.4%[14]
Tablet 25 mg, 64 weeks (OASIS 4)
-13.6%[20]
Placebo (OASIS 4)
-2.2%[20]
Semaglutide's key trials
TrialWho was studiedResultFunded by
STEP 1 [14]1,961 adults with obesity or overweight, no diabetes, 68 weeksWeight −14.9% vs −2.4%Novo Nordisk
STEP 1 extension [15]327 selected participants; exploratory year after medication and lifestyle intervention withdrawalRegained 11.6 of 17.3 points lostNovo Nordisk authors
SELECT [16]17,604 adults with heart disease and BMI 27+, no diabetesFirst composite events 6.5% versus 8.0%; HR 0.80 (95% CI 0.72–0.90)Novo Nordisk
FLOW [17]3,533 adults with type 2 diabetes and kidney diseaseKidney/CV-death composite: 331 versus 410 first events; HR 0.76 (95% CI 0.66–0.88)Novo Nordisk
ESSENCE, part 1 [18]800 adults with MASH and F2 to F3 fibrosis, 72-week interimSteatohepatitis resolution without fibrosis worsening: 62.9% versus 34.3%; fibrosis improvement without steatohepatitis worsening: 36.8% versus 22.4%Novo Nordisk
SUSTAIN-6 [19]3,297 adults with type 2 diabetes at high heart riskHeart events 6.6% vs 8.9%; retinopathy complications HR 1.76 (95% CI 1.11–2.78)Novo Nordisk
OASIS 4 [20]307 adults with obesity or overweight, no diabetes, 64 weeksWeight −13.6% vs −2.2% on the 25 mg tabletNovo Nordisk

Every trial here was run with Novo Nordisk, which makes semaglutide. ESSENCE randomized 1,197 participants; these liver-histology results concern the first 800 at the planned 72-week interim analysis, not proof of fewer clinical liver events. FLOW’s primary composite includes cardiovascular death; the trial stopped early after a prespecified interim analysis.

The newest dose has its own numbers. FDA added the 7.2 mg Wegovy HD dose after two 72-week trials that the label calls Studies 8 and 9. In adults with obesity and no diabetes, weight fell 18.8% on 7.2 mg, 15.5% on 2.4 mg and 3.9% on placebo [3]. Across clinical trials with and without type 2 diabetes, the label reports more dysesthesia with the higher dose, an odd skin sensation such as tingling or burning: 22% on 7.2 mg against 6% on 2.4 mg.

The stopping result is the one most people don't hear. A year after STEP 1 participants came off semaglutide and the trial's lifestyle program, they had regained about two-thirds of the weight they'd lost, and blood pressure and other risk factors drifted back toward where they started [15]. This selected exploratory subgroup is not an individual forecast. Medication and lifestyle support ended together, so the extension does not isolate stopping the drug from stopping support.

Semaglutide causes weight loss mainly by cutting appetite

Semaglutide leads to weight loss because people eat less. The Wegovy label says it “decreases calorie intake,” that “the effects are likely mediated by affecting appetite,” and that it “lowers body weight with greater fat mass loss than lean mass loss” [3]. It also delays gastric emptying; this does not establish that a single mechanism explains every participant’s weight change or digestive symptom.

The label reports greater fat-mass than lean-mass loss, which does not mean lean tissue is completely spared. A trial’s mean weight change cannot assign how much of an individual’s result came from appetite, food intake, activity or other factors. Ask the clinician how nutrition, strength and clinical follow-up fit the treatment plan rather than treating the drug as a guarantee of selective fat loss.

Mechanistic explanations need limits. Delayed gastric emptying is a labeled effect, but it is not proof of the cause of every episode of nausea or every symptom after stopping. Persistent or severe symptoms require clinical assessment. The withdrawal evidence above concerns observed weight and risk-factor changes under specified study conditions.

Digestive effects and serious warnings differ by formulation and population

Every semaglutide product carries a boxed warning about thyroid C-cell tumors seen in rodents, and personal or family history of medullary thyroid carcinoma or MEN 2 is a contraindication. Human relevance of the rodent findings is unknown; serious allergy to semaglutide or the product’s ingredients is another contraindication. The common side effects are gastrointestinal. In the label’s adult weight-management injection trials, 73% reported gastrointestinal events versus 47% on placebo; these were reported most frequently during escalation [3].

Common side effects on Wegovy 2.4 mg in the weight trials (label Table 3)
Side effectPlaceboSemaglutide 2.4 mg
Nausea16%44%
Diarrhea16%30%
Vomiting6%24%
Constipation11%24%
Abdominal pain10%20%
Headache10%14%
Fatigue5%11%

These are pooled adult Wegovy 2.4 mg weight-management trial rates, not rates for every semaglutide formulation or a direct comparison with Ozempic. See the Ozempic page for its separate trial populations and table.

The labels also warn about pancreatitis, gallbladder disease, low blood sugar with insulin or sulfonylureas, kidney injury from dehydration, allergic reactions, a faster heart rate and aspiration during anesthesia. In type 2 diabetes, SUSTAIN-6 found more diabetic eye complications on semaglutide (hazard ratio 1.76) [19]. In STEP 1, stomach side effects led 4.5% of people to stop, against 0.8% on placebo [14]. Brand-specific detail is in Wegovy side effects and Ozempic safety and side effects.

The generic name, tentative approval and compounding are different concepts

Semaglutide is itself the generic name; Ozempic and Wegovy are brand names. The cited FDA record for Apotex ANDA 220314 lists semaglutide injection with tentative approval dated April 7, 2026 [6]. The record lists tentative approval rather than approval to market. Do not treat that status as a product currently authorized for sale.

A tentative application record is not a complete inventory of future approvals. Ask what exact FDA-approved product an offer refers to. A pharmacy-compounded preparation does not become an FDA-approved generic because it contains the same named ingredient.

Compounded semaglutide is a distinct pharmacy preparation

Compounded semaglutide is not FDA-approved, and FDA does not review it for safety, effectiveness or quality before marketing [11]. The shortage affected certain restrictions on essentially-copy compounding, while other statutory requirements still applied. FDA declared the shortage over on February 21, 2025, and the grace periods for compounders ended that spring [10]. The current framework distinguishes patient-specific section 503A compounding from section 503B bulk-ingredient requirements. A seller’s availability claim does not establish compliance.

FDA reports 990 adverse-event reports associated with compounded semaglutide through May 31, 2026; these do not establish causality, incidence or comparative risk, and says salt forms such as semaglutide sodium have no known lawful basis for compounding [11]. Our guides cover compounded semaglutide, whether it will be banned and how it compares with Ozempic.

Tirzepatide produced more weight loss head to head; liraglutide produced less

Head to head, tirzepatide beat semaglutide on weight: −20.2% vs −13.7% at 72 weeks in SURMOUNT-5, an open-label trial of 751 adults with obesity without type 2 diabetes, funded by Eli Lilly. It compared maximum tolerated tirzepatide 10/15 mg with semaglutide 1.7/2.4 mg, not every current formulation or dose [21]. Against the older daily drug liraglutide, semaglutide won: −15.8% vs −6.4% at 68 weeks in STEP 8, a trial with Novo Nordisk authors, whose company makes both drugs [22].

See semaglutide vs tirzepatide for the full comparison, and our tirzepatide and liraglutide pages for each drug on its own.

Brand offers use different supply units and eligibility conditions

Brand semaglutide’s self-pay price depends on the product and offer eligibility. Wegovy’s quoted month is four pens or 30 tablets; Ozempic’s offer unit is one pen, whose time covered depends on the prescribed regimen. The lowest tablet strength is not a maintenance-dose budget. Clinical fees may be separate, offers can change or end, and cash payments outside insurance do not automatically count toward deductibles or out-of-pocket limits. Through NovoCare right now, the Wegovy pen is $349 a month, Wegovy HD is $399, the Wegovy pill is $149 to $299 by dose, and Ozempic is $349 to $499 [12] [13]. New patients pay $199 for their first two pen fills at the lowest doses, through December 31, 2026.

Semaglutide self-pay prices from the maker (NovoCare)
ProductDosesSelf-pay a monthNote
Wegovy pen0.25 to 2.4 mg$349$199 for first 2 fills (0.25, 0.5 mg) for new patients through December 31, 2026
Wegovy HD pen7.2 mg$399One month = 4 pens
Wegovy pill1.5 mg / 4 mg / 9 or 25 mg$149 / $199 / $299One month = 30 tablets
Ozempic pen0.25 to 1 mg / 2 mg$349 / $499Eligible new-patient intro; one-pen offer unit, not guaranteed calendar coverage

Source: NovoCare savings pages. NovoCare says pricing will be updated after December 31, 2026.

A pharmacy-made offer needs a separate written quote: exact preparation, clinical fees, supply duration, renewal interval and pharmacy identity. Compare the SnagRx review and Found review for service and billing questions, and use the cost calculator to separate cash payment dates from an annualized monthly equivalent. A named pharmacy is a starting point for verification, not proof of assignment, product approval or independent quality assessment.

For the full picture, read what compounded semaglutide costs and what Wegovy costs, or see every program scored on the compounded semaglutide board and, for pills, the GLP-1 pill programs board.

Every form of semaglutide needs a prescription

Every semaglutide product needs a prescription, brand or compounded. Your own clinician can write it and send it to a local pharmacy or NovoCare Pharmacy. Telehealth programs also prescribe both brand and compounded versions after an online intake. If you're thinking about very small doses, our GLP-1 microdosing guide explains what hasn't been tested.

Research on Semaglutide

Semaglutide compared

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Providers that offer Semaglutide

  • CoreAge RxPartner

    You want compounded tirzepatide or semaglutide at one price for every dose, and you're comfortable paying before the doctor reviews your intake.

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  • DirectMedsPartner

    You want an online clinician evaluation and bundled supplies, and you will resolve the written billing and pharmacy details before choosing a plan.

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  • Gala GLP-1Partner

    You want compounded tirzepatide or semaglutide at one price for every dose, with an app and chat for the day-to-day, and you live anywhere in the US.

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  • AHBARx

    You value a provider-described renewal reassessment and are willing to resolve the membership charge, exact prescriber, dispensing location and full commitment in writing before enrolling.

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  • altRx

    You value a published flat-dose-price promise and disclosed clinical and pharmacy networks, and will clarify the renewal, dispensing and refund conditions before accepting a paid bundle.

    Read the review →
  • Arc-1

    You want to investigate rapamycin alongside weight-care offers and will obtain product, renewal and refund details before accepting the subscription.

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  • ARSYNL Rx

    You want a published monthly compounded-injection offer with named possible pharmacy partners, and will clarify the assigned care team, formulation and renewal terms.

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  • Bayan Health

    You're settled on a compounded GLP-1 for the long haul and want one flat price at every dose, with the consult and shipping folded in.

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  • Belle

    You want a published month-to-month GLP-1 price, provider-described dose-independent charges and named pharmacy options, and you will confirm the clinical and renewal arrangements before paying.

    Read the review →
  • Bionomy Health

    You prefer pay-per-fill approval and no automatic membership renewal, and will verify the practitioner, dispensing location and exact order conditions.

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  • Chia

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  • Collective

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  • Eden

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  • EdgeRx

    You're a man who wants a compounded GLP-1 with physician review folded into one monthly price, from a company that names its pharmacy and lets you stop any month.

    Read the review →
  • ElitePhysiqMD

    You want a live video visit with a physician before you start, and you plan to stay long enough for the membership's free shipping and visit fees to pay off.

    Read the review →
  • ElleS

    You want an online clinician evaluation and ongoing support, and you are comfortable requesting a complete written quote before deciding.

    Read the review →
  • Embody

    You want a program that identifies its clinician network and pharmacy partners, and will confirm the complete financial agreement before paying.

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  • Enhance MD

    You want labs and a live video visit built into a flat-priced compounded GLP-1 plan, and you like seeing the pharmacies and medical groups named.

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  • Found

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  • Goldspan Health

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  • HealthRX

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  • Henry Meds

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  • iThriveMD

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  • Luvo Health

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  • Strut Health

    You value a public product menu and clinician messaging, and will confirm the refill calendar, dispensing pharmacy and formulation-specific evidence first.

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    You want to see exactly what each dose of compounded tirzepatide or semaglutide will cost before you start, with the visit and shipping included.

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Frequently asked

Is semaglutide the same as Ozempic?
Ozempic contains semaglutide, so the drug is the same. Ozempic is one product made from it, approved for type 2 diabetes, in its own doses and pens.
Is semaglutide the same as Wegovy?
Wegovy also contains semaglutide. It's the product approved for weight management and heart-risk reduction, with higher doses than Ozempic and a daily pill version.
What is semaglutide used for?
Uses depend on the exact product and population. Injection/tablet diabetes indications differ from Wegovy weight and cardiovascular indications. Kidney risk reduction requires type 2 diabetes with chronic kidney disease; cardiovascular indications have disease or risk qualifiers. MASH treatment is injection-only in adults with noncirrhotic F2–F3 disease, and pediatric weight treatment is injection-only.
Is there a generic for semaglutide?
The cited FDA record for ANDA 220314 is tentative approval, which does not permit marketing. The chemical’s generic name is not proof that a product is an approved generic. Compounded semaglutide is not an FDA-approved generic.
How does semaglutide work for weight loss?
It reduces appetite and calorie intake by acting on GLP-1 receptors, including in the brain, and slows stomach emptying. People eat less, and the labels say more fat than lean mass is lost.
Does semaglutide work as a pill?
Yes. Wegovy tablets are a daily semaglutide pill approved for weight. In OASIS 4, the 25 mg tablet cut weight 13.6% vs 2.2% on placebo over 64 weeks.

Sources

  1. [1] Rybelsus and Ozempic tablets, prescribing information (2026). DailyMed label
  2. [2] McGuire DK. Oral Semaglutide and Cardiovascular Outcomes in High-Risk Type 2 Diabetes (2025). PMID 40162642
  3. [3] Wegovy (semaglutide) injection and tablets, prescribing information (2026). DailyMed label
  4. [4] Ozempic (semaglutide) injection, prescribing information (2026). DailyMed label
  5. [5] Drugs@FDA: Ozempic, NDA 209637 (2026). FDA
  6. [6] Drugs@FDA: semaglutide injection, ANDA 220314 (tentative approval) (2026). FDA
  7. [7] FDA Drug Shortages database (2026). FDA
  8. [8] NDA 213051 S-030 approval letter (Ozempic tablets name) (2026). FDA
  9. [9] Wegovy tablets approval letter, NDA 218316 (2025). FDA
  10. [10] FDA clarifies policies for compounders as national GLP-1 supply begins to stabilize (2026). FDA
  11. [11] FDA's concerns with unapproved GLP-1 drugs used for weight loss (2026). FDA
  12. [12] NovoCare: Wegovy savings offer and self-pay pricing (2026). Company website
  13. [13] NovoCare: Ozempic savings offer and self-pay pricing (2026). Company website
  14. [14] Wilding JPH. Once-Weekly Semaglutide in Adults with Overweight or Obesity (2021). PMID 33567185
  15. [15] Wilding JPH. Weight regain and cardiometabolic effects after withdrawal of semaglutide: The STEP 1 trial extension (2022). PMID 35441470
  16. [16] Lincoff AM. Semaglutide and Cardiovascular Outcomes in Obesity without Diabetes (2023). PMID 37952131
  17. [17] Perkovic V. Effects of Semaglutide on Chronic Kidney Disease in Patients with Type 2 Diabetes (2024). PMID 38785209
  18. [18] Sanyal AJ. Phase 3 Trial of Semaglutide in Metabolic Dysfunction-Associated Steatohepatitis (2025). PMID 40305708
  19. [19] Marso SP. Semaglutide and Cardiovascular Outcomes in Patients with Type 2 Diabetes (2016). PMID 27633186
  20. [20] Wharton S. Oral Semaglutide at a Dose of 25 mg in Adults with Overweight or Obesity (2025). PMID 40934115
  21. [21] Aronne LJ. Tirzepatide as Compared with Semaglutide for the Treatment of Obesity (2025). PMID 40353578
  22. [22] Rubino DM. Effect of Weekly Subcutaneous Semaglutide vs Daily Liraglutide on Body Weight in Adults With Overweight or Obesity Without Diabetes: The STEP 8 Randomized Clinical Trial (2022). PMID 35015037