Why it’s confusing
Let’s make sense of weight loss.
One goal, many names
Ozempic, Wegovy, Zepbound, compounded semaglutide — telling them apart is genuinely hard.
Real science, buried in hype
GLP-1 medicines have strong trial evidence, but the facts get lost in marketing.
Every site feels like an ad
Plain, honest information that is not selling you something is hard to find.
The basics go unexplained
Prescription vs compounded, provider vs pharmacy — rarely spelled out in simple terms.
It’s not you — the information out there is a mess. Here’s the clear version.
Start with the basics ↓The research
Peptides studied for weight loss
Three peptide medicines dominate weight loss. All are FDA-approved, all prescription-only.
The weekly shot in Wegovy® and Ozempic®. The one most people start by asking about.
Read the simple guide →
The strongest trial results so far. Sold as Zepbound® and Mounjaro®.
Read the simple guide →
The older daily shot (Saxenda®, Victoza®). Now has cheaper generic versions.
Read the simple guide →Overview
What you need to know.
GLP-1 for weight loss is one of the biggest health topics right now. You have seen the ads, the headlines, and the brand names. You may still feel unsure what any of it means.
The names pile up fast, like Wegovy®, Zepbound®, Ozempic®, and Mounjaro®. Ads promise a lot, and friends share very different stories. That mix can leave you more confused than when you began.
This page is your starting point. It explains what these medicines are, which brands are approved for weight loss, and how people begin. Then it points you to the right next read.
Getting started
Where to start with Weight Loss
Talk to Your Doctor
Discuss your goals, health history, and whether medication is appropriate. Get baseline bloodwork.
Choose Your Approach
Compare GLP-1 providers based on pricing, physician access, and pharmacy quality. Read our provider comparison.
Build Your Foundation
Set up your nutrition (adequate protein, whole foods) and start resistance training 3x per week.
Start here
10 Peptide Terms Everyone Should Know (Explained Simply)
New to peptides or the weight-loss shots? The 10 terms you will see everywhere: GLP-1, compounded, BAC water, reconstitution, and…
KEY TAKEAWAYS
- Wegovy® and Zepbound® are the two brands FDA-approved for weight loss in adults.
- Wegovy® (semaglutide) helped adults lose about 14.9% of body weight in STEP 1.
- Zepbound® (tirzepatide) helped adults lose about 20.9% at the 15 mg dose in SURMOUNT-1.
- Saxenda® (liraglutide) is an older daily-shot brand approved for weight management.
- These medicines carry a boxed warning, so a licensed clinician decides if they fit.
What readers want to figure out?
- You want to know what GLP-1 for weight loss really means.
- You want to know which brands are FDA-approved for weight loss.
- You want a simple read on how much weight people lose.
- You want to know how people start and what side effects feel like.
- You want to know which page to read next for your situation.
What GLP-1 medicines are, in plain terms?
GLP-1 is a hormone your gut makes after you eat. It helps manage blood sugar and tells your brain you are full. Your body clears it within minutes.
GLP-1 medicines copy that natural hormone. They are built to last much longer, so one dose can work for days. That steady signal is the whole idea.
The effect is simple to picture. Food leaves your stomach more slowly, so you feel full sooner. Appetite signals quiet down, including what many people call food noise.
Some newer medicines copy a second gut hormone too. Zepbound® (brand of tirzepatide) acts on both the GIP and GLP-1 receptors. That dual action is why it is called a dual GIP/GLP-1 medicine.
The brands approved for weight loss
Two brands lead GLP-1 for weight loss in the US. Wegovy® (brand of semaglutide) and Zepbound® (brand of tirzepatide) are both FDA-approved for chronic weight management in adults.
The timing is recent. The FDA approved Wegovy® in 2021 and Zepbound® in November 2023. Both are once-weekly shots.
Saxenda® (brand of liraglutide) is an older option. It is a daily shot approved for weight management before the other two arrived.
Some famous names are not weight-loss brands. Ozempic® and Rybelsus® also contain semaglutide, and Mounjaro® contains tirzepatide. The FDA approves those three for type 2 diabetes, not weight loss.
Two brands anchor GLP-1 for weight loss in the US: Wegovy® and Zepbound®. Everything else builds from there.
The weight-loss trials, by brand
Each brand earned approval through a large, named clinical trial. The numbers below are averages, and results vary from person to person.
STEP 1 tested Wegovy® in 1,961 adults. Those on Wegovy® lost about 14.9% of their body weight over 68 weeks, versus 2.4% on placebo (Wilding 2021).
SURMOUNT-1 tested Zepbound® in 2,539 adults. Those on the 15 mg dose lost about 20.9% over 72 weeks (Jastreboff 2022). Average loss ranged from 16.0% to 22.5% across the three doses.
SCALE tested Saxenda® in 3,731 adults. Those on Saxenda® lost about 8.0% of body weight over 56 weeks, versus 2.6% on placebo (Pi-Sunyer 2015).
These trial numbers apply only to the FDA-approved branded products. They do not transfer to compounded semaglutide (not FDA-approved; not a generic of Wegovy® or Ozempic®). Our semaglutide monograph covers that topic in depth.
| Brand (ingredient) | Named trial (adults) | Average weight change | Time frame | How it is taken |
| Wegovy® (semaglutide) | STEP 1 (1,961) | About 14.9% | 68 weeks | Weekly shot |
| Zepbound® (tirzepatide) | SURMOUNT-1 (2,539) | About 20.9% at 15 mg | 72 weeks | Weekly shot |
| Saxenda® (liraglutide) | SCALE (3,731) | About 8.0% | 56 weeks | Daily shot |
Figures are mean body-weight change in adults, for branded products only. Full citations appear in the Sources list below.
Who these medicines are for?
Wegovy® and Zepbound® are prescribed for adults with obesity. They may also fit adults who are overweight and have a weight-related condition, like high blood pressure.
They are not right for everyone. A licensed clinician reviews your health history first. Pregnancy and certain thyroid conditions are reasons to avoid them.
This page stays at the big-picture level. Your own clinician weighs the details for your situation.
How people start?
Most people begin one of two ways. One path is your regular doctor or an obesity medicine specialist. The other is a telehealth program built around these medicines.
The basic steps look similar. You share your health history, a licensed clinician reviews it, and a prescription follows if it fits.
Doses usually start low and rise slowly over weeks. That slow climb, called titration, helps your body adjust. Regular check-ins are part of the plan.
What to expect with side effects and safety?
Most side effects involve the gut. The common ones are nausea, diarrhea, vomiting, and constipation. They often ease as your body adjusts and doses rise slowly.
Less common but more serious problems can happen. That is one reason a clinician follows you over time. Report severe or lasting stomach pain right away.
All three labels carry an FDA boxed warning. It describes a rare thyroid tumor seen in rodent studies (medullary thyroid carcinoma). People with a personal or family history of that cancer, or of MEN 2, should not use these medicines.
Weight loss on these medicines is a slow build, measured in months and guided by a licensed clinician.
Which page should you read next?
This page is the map, not the whole trip. Where you go next depends on what you want to know. The guide below points the way.
| If you want to... | Read this next |
| Understand Wegovy® and semaglutide in depth | Our semaglutide monograph |
| Understand Zepbound® and tirzepatide in depth | Our tirzepatide monograph |
| Compare the two head to head | Our Wegovy® vs Zepbound® comparison |
| See where to get care | Our provider comparison |
The Bottom Line
GLP-1 for weight loss comes down to a few clear facts. Wegovy® and Zepbound® are the two brands FDA-approved for weight loss, and Saxenda® is an older option.
Trials like STEP 1 and SURMOUNT-1 show meaningful average weight loss over many months. The numbers apply to the branded products only.
Your next step is personal. A licensed clinician decides if a medicine fits, and the pages below help you compare your options.
Sources
- Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1). N Engl J Med. 2021. https://www.nejm.org/doi/full/10.1056/NEJMoa2032183
- Jastreboff AM, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). N Engl J Med. 2022. https://www.nejm.org/doi/full/10.1056/NEJMoa2206038
- Pi-Sunyer X, et al. A Randomized, Controlled Trial of 3.0 mg of Liraglutide in Weight Management (SCALE). N Engl J Med. 2015. https://www.nejm.org/doi/full/10.1056/NEJMoa1411892
- US Food and Drug Administration. FDA Approves New Medication for Chronic Weight Management (Zepbound). 2023. https://www.fda.gov/news-events/press-announcements/fda-approves-new-medication-chronic-weight-management
- US Food and Drug Administration. WEGOVY (semaglutide) injection: Highlights of Prescribing Information. 2025. https://www.accessdata.fda.gov/drugsatfda_docs/label/2025/215256s024lbl.pdf
- Muller TD, et al. Glucagon-like peptide 1 (GLP-1). Mol Metab. 2019. https://pmc.ncbi.nlm.nih.gov/articles/PMC6812410/
Last updated: 2026-07-09 · Editorially reviewed by the Peptides.io team
KEEP READING
Where to get GLP-1 care: our provider comparison
See how the leading GLP-1 telehealth programs compare on pharmacy type, prescriber model, titration support, and follow-up.
→ Read next: Best GLP-1-Providers
Good to know
Quick tips
Protein is your best friend during weight loss — aim for 0.7-1g per pound of bodyweight to protect muscle
Weigh yourself at the same time daily and track the 7-day average — daily swings of 2-4 lbs are normal
Resistance training 3-4x per week is essential to keep muscle while losing fat
Sleep 7-9 hours every night — sleep deprivation increases hunger hormones significantly
Drink water before meals — even mild dehydration feels like hunger
Focus on fiber-rich foods (vegetables, beans, whole grains) to stay full longer
Weight Loss
Guide Library
Guides to help you make informed decisions.
Start Here
1New to this? Begin with these guides.
Peptide Guides
3Individual peptide profiles and research.
Mounjaro® & Zepbound®: The Tirzepatide Brands Explained
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Semaglutide: GLP-1 Research and Provider Guide
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Liraglutide: The Daily GLP-1, Explained
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Zepbound®, Wegovy® and constipation: what may help
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Wegovy® and Ozempic® cost and coverage guide
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Zepbound®, Mounjaro® and diarrhea: what may help
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Zepbound® and Mounjaro® cost and coverage guide
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Zepbound® for sleep apnea: what the evidence shows
Sleep apnea steals your rest and leaves you tired all day. Zepbound is a new option for some adults who live with obesity and this condition.
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Thinking About Switching GLP-1 Providers? Read This First
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Ozempic®, Wegovy® and pregnancy: what labels say
GLP-1 medicines and pregnancy can stir up a lot of worry. Maybe you are hoping to start a family soon. Maybe a pregnancy came as a surprise.
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Do Ozempic®, Wegovy® or Zepbound® make you tired?
GLP-1 fatigue is that heavy, worn-out feeling some people notice on Ozempic, Wegovy or Zepbound. Maybe you expected more energy, not less.
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Can you drink alcohol with Zepbound® or Wegovy®?
Maybe a friend's birthday is coming up, and you take Wegovy or Zepbound. Now GLP-1 and alcohol feels like a real question.
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What happens after stopping Zepbound® or Wegovy®?
Stopping a GLP-1 medication like Wegovy or Zepbound is a big step. You may wonder what happens to your weight next.
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A practical eating plan for Wegovy® and Zepbound®
A GLP-1 eating plan sounds simple until the nausea hits. You start Wegovy or Zepbound, your appetite drops fast, and food turns into a puzzle.
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Mochi Health review (2026): strengths, limits, fit
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What is Ozempic®?
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Ozempic®, Wegovy® and hair loss: what to know
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GLP-1 injection sites: a brand-by-brand guide
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What is GLP-1? A Beginner's Guide
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How to store and travel with GLP-1 medicines
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Wegovy® vs Ozempic®: Same Medicine, Different Job
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Saxenda® & Victoza®: The Liraglutide Brands Explained
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Compounded GLP-1: What it is and What the FDA says
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Obesity Treatment: Questions to Ask Your Doctor
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How to Tell If a GLP-1 Provider Is Actually Legit
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Zepbound®, Wegovy® and sulfur burps: what may help
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What is Foundayo™?
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How long do Wegovy® and Zepbound® take to work?
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How Much Should You Actually Pay for a GLP-1 Program?
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What is the Wegovy® Pill?
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Long-term effects of Ozempic® and Wegovy®
If you are thinking about years on a shot, the long-term effects of Ozempic and Wegovy can feel like a big unknown.
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What is Wegovy®?
Wegovy is the official semaglutide brand for weight loss — and now there is a Wegovy pill, too. What it is and how it compares, in everyday words.
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What is Mounjaro®?
Mounjaro is Eli Lilly’s blockbuster type 2 diabetes shot — and the same medicine as Zepbound. What it is and how it compares, in everyday words.
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What is Zepbound®?
Zepbound is the weight-loss shot from Eli Lilly. What it is, how it works, and how it compares to Wegovy, Ozempic, Mounjaro, and the new Foundayo pill — in everyday words.
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Semaglutide vs tirzepatide: which GLP-1 wins in 2026?
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Wegovy® dose escalation: what to expect in the first 4 months (2026)
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Not losing weight on Ozempic® or Wegovy®? What to check
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The 5 Best GLP-1 Programs for Weight Loss in 2026
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Ozempic® vs Rybelsus®: injection or tablet?
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Ozempic®, Wegovy® and GLP-1 for PCOS: the evidence
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Why Your GLP-1 Stopped Working (And What to Do About It)
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How long does it take Wegovy® or Zepbound® to start showing weight loss? A week-by-week timeline (2026)
A simple week-by-week timeline of what to expect on Wegovy® and Zepbound® — when appetite suppression typically kicks in, when the scale starts moving, and when most people hit their first plateau. Based on the published STEP 1 (Wegovy®) and SURMOUNT-1 (Zepbound®) trial data.
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Saxenda® and Victoza® dosage schedules explained
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Type 2 Diabetes: Treatment Options & What to Ask Your Doctor
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Saxenda® and Victoza® side effects: what to expect
Saxenda and Victoza side effects are on your mind before you even open the pen. That worry is fair, and it is common.
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Starting GLP-1 for Weight Loss: My Honest Guide for 2026
My honest take on GLP-1 for weight loss in 2026 — what it is, how it works, who it works best for, and what the clinical research actually shows.
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Wegovy®, Ozempic®, and Nausea: What May Help
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Saxenda® vs Wegovy® for weight management
Saxenda vs Wegovy is the choice a lot of people face when they start looking at weight management shots. Both are FDA-approved. Both can help.
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Saxenda® vs Zepbound® for weight management
Saxenda vs Zepbound is a fair thing to weigh if you want help managing your weight. Both are real options.
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Mounjaro® vs Ozempic® for Type 2 Diabetes
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Common questions
What does GLP-1 for weight loss mean?
Which GLP-1 brands are FDA-approved for weight loss?
How much weight do people lose on Wegovy® and Zepbound®?
Are Ozempic® and Mounjaro® approved for weight loss?
What are the most common side effects?
When you are ready to decide
See the top weight loss brands, compared
Once you understand your options, here are the products and providers we have vetted — scored side by side, so you can decide with a clear head. Always talk to a licensed provider first.
The 5 Best GLP-1 Programs for Weight Loss in 2026
The top online GLP-1 weight-loss programs, ranked on real pricing, medication options, and reader outcomes.
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