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Ranked Guide · 2026

Best Peptides for Weight Loss

Pharmacological weight loss has been transformed in the last five years by GLP-1 receptor agonists and their successors. This guide ranks leading options based on the published clinical literature for the FDA-approved versions of these medicines, side-effect profiles, and physician experience. Compounded medications are not FDA-approved, and individual results vary. Every medication listed here is prescribed only after a licensed physician reviews your intake, medical history, and clinical eligibility. Compounded versions are prepared by FDA-registered pharmacies at substantially lower out-of-pocket cost; compounded medications are not FDA-approved and are not reviewed by the FDA for safety, effectiveness, or quality.

Medically reviewed by Dr. Gene Lee, MD · May 2026
  1. 1
    Tirzepatide (Injectable)
    $199/mo

    Dual GIP+GLP-1 mechanism produces the strongest weight loss among approved GLP-1s — up to 22.5% body weight loss at maximum dose (SURMOUNT-1 trial). Beat semaglutide head-to-head in SURPASS-2.

    Best for: Patients with BMI ≥30 (or ≥27 with comorbidities) who want maximal weight loss and can tolerate the dose-escalation phase.
    See full Tirzepatide (Injectable) protocol
  2. 3
    Semaglutide (Injectable)
    $99/mo

    Most-studied GLP-1 with the longest safety record. STEP 1 trial: 14.9% weight loss at 68 weeks. SELECT trial showed 20% cardiovascular event reduction.

    Best for: First-time GLP-1 patients, patients with cardiovascular concerns, and those who want established long-term safety data.
    See full Semaglutide (Injectable) protocol
  3. 4
    Semaglutide (Oral)
    $249/mo

    Compounded semaglutide delivered as a sublingual troche. Lower bioavailability than injection but suits patients who refuse needles.

    Best for: Patients with needle aversion or those who want a simpler delivery method.
    See full Semaglutide (Oral) protocol

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FAQ

Which weight loss peptide is best for me?

It depends on your starting weight, comorbidities, and tolerance for GI side effects. Most physicians start with Semaglutide for first-time GLP-1 patients and switch to Tirzepatide if response is suboptimal. Retatrutide is reserved for patients who plateau on the others. Your prescribing physician selects the right starting point based on your intake.

How fast do weight loss peptides work?

Most patients lose 1-3 pounds in the first month, accelerating in months 2-6. Maximum effect is typically reached at month 12-18 with continued dose titration. Average outcomes: 15-20% body weight reduction at 1 year on Tirzepatide, 12-15% on Semaglutide.

Will I regain weight after stopping?

The STEP 4 trial showed that patients who stopped Semaglutide regained two-thirds of their weight loss within a year. Most patients transition to a lower maintenance dose rather than stopping completely, or combine the peptide with intensive lifestyle support to preserve results.

Are compounded GLP-1s the same as brand name?

No. Compounded GLP-1s are not FDA-approved and are not generic or equivalent versions of the brand-name drugs. They are prepared by FDA-registered 503A compounding pharmacies, and the FDA does not review compounded drugs for safety, effectiveness, or quality. Whether compounded therapy is appropriate for you is a decision made with your licensed physician.

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The assessment process available on the [pepti] website asks a series of medical questions, and the answers provided are reviewed by an independent licensed physician affiliated with our partner physician network. The licensed providers have established exclusionary criteria, and the answers provided determine if the individual is screened out of eligibility for treatment. The licensed clinicians retain the sole decision to prescribe peptide therapy and other compounded medications to patients. Treatment may be denied at the physician's sole discretion. If a prescription is not approved, you will not be charged for the medication.

Pharmacy Providers. [pepti] is a technology platform and is not a healthcare provider, pharmacy, or prescriber. All medications offered through the platform are compounded by independent FDA-registered 503A or 503B compounding pharmacies based on a valid prescription written by a licensed physician for an individual patient. Compounded medications are not FDA-approved as products. The active pharmaceutical ingredients used by our partner pharmacies are sourced from FDA-registered facilities. Compounded medications may not undergo the same testing or quality control as commercially manufactured FDA-approved drugs.

Results vary. Results from peptide therapy and other compounded treatments vary based on individual factors, including age, weight, medical history, adherence to the prescribed protocol, lifestyle factors, and physiological response. [pepti] makes no guarantee of any specific outcome. Statements about peptide therapy and compounded medications offered through the platform have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.

Product images. Product photographs and renderings shown on this website are for illustrative purposes only. The appearance of vials, packaging, labeling, and other materials you receive may vary and is determined by the dispensing compounding pharmacy.

Off-label use.Many peptides offered through the platform are prescribed for off-label use. “Off-label” means the medication is being prescribed for a use, dose, or patient population that is not specifically approved by the FDA. Off-label prescribing is legal and common in U.S. medical practice when supported by clinical experience and judgment.

Mailing & shipping. Pepti currently dispenses prescription medication to patients in Florida and Texas. All orders ship in unbranded, tamper-evident packaging via expedited delivery from our partner compounding pharmacies. Temperature-sensitive medications ship with insulated packaging and ice packs. Shipping is included at no additional cost. We do not currently ship medication outside Florida and Texas, internationally, or to APO/FPO addresses.

Not for emergencies. [pepti] is not designed for medical emergencies. If you are experiencing a medical emergency, call 911 or go to your nearest emergency room immediately. For urgent but non-emergency medical questions, contact your primary care provider or use an urgent care service.

No doctor-patient relationship with [pepti]. Your use of the platform does not create a doctor-patient relationship between you and pepti LLC. A doctor-patient relationship is established only between you and the independent licensed physician who reviews your intake and prescribes your treatment. The physicians who use the platform are independent contractors and are solely responsible for the medical care they provide.

Prescription medications. All prescription products require a valid prescription from a licensed healthcare provider. By using the platform, you acknowledge that you are at least 18 years old and that the information you provide is true, accurate, current, and complete. Providing false information may result in inappropriate treatment recommendations or denial of service.

Cosmetic & wellness products.Certain products offered through [pepti] — including skincare, hair care, body care, supplements, men's grooming, sports recovery, and sexual wellness products — are cosmetic or dietary supplement products, not prescription medications. These products do not require a prescription and are not reviewed or prescribed by a physician. Statements regarding dietary supplements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Results vary by individual. Consult your healthcare provider before starting any new supplement or topical product, especially if you are pregnant, nursing, or taking other medications.

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