Increasingly more people are turning to therapeutic peptides to shed weight. Around 12% of adults have taken a particular category of weight loss peptides called glucagon-like peptide-1 receptor agonists (GLP-1 RAs), and combined sales of the most popular GLP-1 RAs have grown by 89% since 2022. The media has reflected this market expansion, with advertisements for brands like Ozempic and Mounjaro playing in practically every commercial break.
Because commercials can tell you only so much, you need other resources to see whether a particular treatment is the one for you. This guide to the best peptides for weight loss integrates all of the most valuable information on the topic — on GLP-1 RAs as well as non-GLP-1 peptide alternatives — to help steer you toward the right decision for your health.
For the quickest rundown of our findings, here’s a handy summary of recommendations directly below. Then you can read through the rest of the guide to understand how we made our selections.
The remaining question is: Where do you get these peptides? Online, the best source we’ve vetted is Bridgeside Telehealth. You can find semaglutide occasionally at lower prices, but no other telemed provider seems to come close to its expansive catalog and attentive intake process.
Most telemed providers have semaglutide, and some have tirzepatide, but Bridgeside Telehealth offers both (in multiple forms and doses) as well as tesamorelin.
This broader array of prescription options serves you well. Bridgeside’s medical intake process involves a live physician consultation, as well as ongoing patient care throughout your treatment. This attention to the patient is an excellent value in the therapeutic peptide space currently, helping to ensure successful and safe treatment. Moreover, because Bridgeside deals exclusively in pharmaceutical-grade peptides, you can be certain you’re getting the highest-quality weight loss medication possible.
Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions about staying healthy and living healthier lifestyles.
In the years since we started covering weight loss peptides, we’ve actively monitored the space and gained a great deal of knowledge on their therapeutic potential. So far, our cumulative research encompasses several hundred scientific papers and over 1,000 hours. Like the peptide space itself, our efforts are ever-growing.
Our team has also built relationships with medical providers who prescribe weight loss peptides, giving us a closer view of the medications’ effects on users than can be found in other sources.
Additionally, like all health-related content on this website, this guide was thoroughly vetted by one or more members of our Medical Review Board for accuracy and will continue to be monitored for updates by our editorial team.
We evaluated the market’s best weight loss peptides based on three criteria that are likely to guide your health choices:
Here’s how our three recommendations performed in each category:
Winner: Tirzepatide
The scientific literature points to tirzepatide and semaglutide as the two most effective peptide categories for weight loss. Between them, tirzepatide is the more effective option for its dual mechanisms of action. Two recent studies make clear its superiority.
The first, published in 2021 in The New England Journal of Medicine, was a 40-week phase 3 trial involving a large sample size of 1,973 patients with type 2 diabetes. The patients were randomized into four groups: three received different doses of tirzepatide — 5, 10, and 15mg per week — and the fourth received 1mg semaglutide. By the study’s end, patients in all three tirzepatide groups lost around 4-12 more pounds than the semaglutide group and exhibited better diabetic biomarkers.
The second was published in JAMA Internal Medicine in 2024. It was a cohort study that examined 18,386 patients with overweight or obesity (mean baseline weight: 242lb) who received tirzepatide or semaglutide between May 2022 and September 2023. The study concluded that tirzepatide was associated with “significantly greater weight loss than semaglutide.”
Don’t take these findings to mean that semaglutide is drastically inferior to tirzepatide. Far from it. You’ll see later, in its dedicated section, just how potent semaglutide is for weight loss. You’ll also see, in another section, why you may want to consider an alternative like tesamorelin instead.
Winner: Semaglutide
GLP-1 RAs in general have a lower side effect risk than tesamorelin, and the literature currently favors semaglutide’s safety profile over that of tirzepatide.
The two GLP-1 receptor agonists covered in this guide have common side effects — nausea, diarrhea, and vomiting — but in the 2021 study we’ve referenced, semaglutide exhibited up to a 5% lower risk of nausea, 4% of diarrhea, and 2% of vomiting. Its lower side effect risk compared to tirzepatide is slight but clear.
With tesamorelin, the most likely adverse events, according to the clinicians we know, are mild flu-like symptoms such as fatigue, headache, and nausea, but it’s also associated with an increased risk of cancer owing to its activity on growth hormone — certainly more worrisome than the gastrointestinal problems linked to GLP-1 RAs. We cover tesamorelin’s cancer risk in greater detail in a later section, “How safe are peptides for weight loss?”
When we say semaglutide is the most widely available weight loss peptide, we mean you can more easily get a prescription through multiple channels.
We’ll illustrate. Say that you want to get tesamorelin or tirzepatide through telemed. With tesamorelin, you’d find that few providers carry it in pharmaceutical grade, and with tirzepatide you’d see a broader but still limited availability.
But semaglutide? You’d be hard-pressed to find a telemed provider that doesn’t have it. A quick accounting shows there are at least ten reputable platforms to choose from:
(That being said, Bridgeside, the first provider on the list, happens to carry all three of our top-recommended weight loss peptides. That’s one reason why it’s our go-to source.)
Therapeutic peptides are typically injectable medications that you have to reconstitute from powder and store in cold conditions. Hardly the picture of convenience. Fortunately, oral weight loss peptides are available, including easy-to-swallow drops, giving the needle-averse among us access to a world of powerful weight loss medications.
And most of them are for semaglutide.
Looking again at the ten reputable telemed platforms we’ve mentioned, we find that eight of them have oral versions of semaglutide:
Meanwhile, only four carry oral tirzepatide — Bridgeside, Zealthy, Henry Meds, and Strut.
So, if oral administration is a must-have for your peptide-assisted weight loss, then you’ll have an easier time finding a semaglutide treatment than a tirzepatide one. (Tesamorelin, by the way, isn’t readily available as an oral medication.)
Please know that ease of use comes at the cost of effectiveness. In a later section, “Injectable vs. oral weight loss peptides,” we discuss how much more effective injectables are compared to non-injectable alternatives.
Before we get into the finer scientific details, take a look at this table comparing our three recommendations across key characteristics:
Peptides are chains of amino acids that are essential for metabolism, wound repair, inflammation control, and innumerable other biochemical processes. They occur naturally but can also be synthesized in a lab to resemble the ones in your body. Those synthetic variants are called therapeutic peptides because they serve specific healing purposes, such as weight loss.
Weight loss peptides fulfill their purpose by mimicking the hormones responsible for regulating your appetite and metabolizing fat. How they go about their mimicry depends on what category of peptides they belong to.
In the following subsections, we discuss three peptide categories that are known to induce weight loss. In each case, your weight loss depends on continued compliance with therapy, so the weight may return after you stop treatment.
Semaglutide and tirzepatide are examples of GLP-1 RAs, a category of peptides originally developed for diabetes management but found to promote weight loss through their actions on the pancreas and digestion. The “GLP-1” part of the name refers to a naturally occurring hormone in the gut that participates in a broad array of physiological functions. Among other things, it:
Normally, your body releases insulin from the pancreas every time you eat. This allows the transport of glucose (a sugar) from the food into your cells, and your cells can then use the glucose for energy. But when the body can’t produce enough insulin or use it normally, glucose accumulates in the blood and leads to diabetes. People with diabetes need to carefully manage their blood sugar, and the insulin-stimulating action of a GLP-1 peptide helps them to do that.
Another characteristic of diabetes is increased levels of glucagon, a pancreatic hormone that tells the liver to release glucose — that sugar whose levels need to be carefully controlled. In other words, glucagon counteracts insulin and worsens diabetes, so blocking its secretion helps with disease management.
Slowed gastric emptying is another way of saying “slower digestion.” That means a less severe glucose spike after you eat, as well as a decreased appetite. And that means a more manageable diabetes and less desire to consume excess calories.
On top of decreasing your appetite outside of meal times, a GLP-1 RA increases your feeling of fullness when you do eat. Again, the result is that you’re less likely to take in more calories throughout the day than you expend.
