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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. The best peptides for weight loss now produce 15-24% body weight reductions in clinical trials — outcomes previously only achievable with bariatric surgery. This guide ranks the top compounds based on published clinical evidence, side-effect profiles, and real-world patient outcomes through Pepti's network. Every medication listed here is prescribed only after a licensed physician reviews your intake, medical history, and clinical eligibility. Compounded versions use the same active pharmaceutical ingredients as their brand-name counterparts (Ozempic, Wegovy, Mounjaro, Zepbound) at substantially lower out-of-pocket cost.

Medically reviewed by Dr. Mohammad Laeeq, MD · May 2026
  1. 1
    Tirzepatide
    $399/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 protocol
  2. 2
    Retatrutide
    $699/mo

    Triple agonist (GLP-1 + GIP + glucagon). Phase 2 trial showed 24.2% weight loss — the highest ever published for a weight-loss drug. Still investigational; prescribed off-label under physician supervision.

    Best for: Patients who plateau on tirzepatide/semaglutide or want the leading-edge protocol.
    See full Retatrutide protocol
  3. 3
    Semaglutide
    $349/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 protocol
  4. 4
    Semaglutide (Oral)
    $299/mo

    Same active ingredient as Wegovy/Ozempic, 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
  5. 5
    AOD-9604
    $219/mo

    Synthetic fragment of HGH targeting fat metabolism without the growth-hormone side effects. Useful as an adjunct to GLP-1 therapy or for patients ineligible for GLP-1s.

    Best for: Stack therapy alongside GLP-1, or patients who can't tolerate GLP-1 side effects.
    See full AOD-9604 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 as effective as brand name?

Yes — they use the same active pharmaceutical ingredient at clinically-equivalent doses. The difference is the formulation (preserved, dosed, and packaged by a 503A compounding pharmacy versus the brand manufacturer) and the cost (typically 50-80% lower).

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