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    2026 Buyer's Guide

    Best Peptides for Fat Loss — 2026

    Top-ranked peptides for fat loss based on research evidence and current vendor availability. Each compound below links to its full research profile, live vendor pricing, and active coupon codes. Compounds researched for metabolic enhancement and body composition.

    Top 6 peptides for fat loss

    1

    Retatrutide

    Metabolic & Weight Loss Top pick

    Retatrutide (also coded **LY3437943**) is an **investigational once-weekly triple-agonist** at the **GLP-1, GIP, and glucagon receptors** — the third-generation incretin-based therapy developed by Eli Lilly. Where [Semaglutide](/compound/semaglutide) activates GLP-1 alone and [Ti…

    Cheapest: $45.00 at Ion Peptide · $7.50/mg· 17 active listings
    2

    Tesofensine

    Weight Loss

    Tesofensine (NS2330) is an orally-administered small-molecule triple monoamine reuptake inhibitor — it blocks the reuptake of noradrenaline, dopamine, and serotonin, placing it in the same broad pharmacologic class as sibutramine (withdrawn 2010 for cardiovascular risk) but with …

    Cheapest: $79.99 at ResearchChemHQ · $2.67/mg· 2 active listings
    3

    Semaglutide

    Metabolic & Weight Loss

    Semaglutide is a glucagon-like peptide-1 receptor agonist (GLP-1 RA) with a molecular weight of 4113.58 Da and CAS number 910463-68-2. It is a 31-amino-acid peptide analog of human GLP-1(7-37) with two key structural modifications: an alpha-aminoisobutyric acid (Aib) substitution…

    Cheapest: $39.00 at Ion Peptide · $7.80/mg· 10 active listings
    4

    Tirzepatide

    Metabolic & Weight Loss

    Tirzepatide is a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist with a molecular weight of 4813.45 Da and CAS number 2023788-19-2. It is a 39-amino-acid synthetic peptide based on the native GIP sequence with modificat…

    Cheapest: $49.00 at Ion Peptide · $4.90/mg· 13 active listings
    5

    SLU-PP-332

    Performance

    SLU-PP-332 is the first-generation synthetic pan-agonist of the estrogen-related receptors (ERR╬▒, ERR╬▓, ERR╬│) developed by the laboratory of Thomas Burris at Saint Louis University and reported in a landmark 2023 publication that established ERR pan-agonism as a pharmacologica…

    Cheapest: $69.99 at VANDL Labs · $1.40/mg· 4 active listings
    6

    5-Amino-1MQ

    Weight Loss

    5-Amino-1MQ (5-amino-1-methylquinolinium iodide) is a small-molecule inhibitor of nicotinamide N-methyltransferase (NNMT), an enzyme that transfers a methyl group from S-adenosyl-L-methionine (SAM) to nicotinamide to form 1-methylnicotinamide (1-MNA) and S-adenosyl-L-homocysteine…

    Cheapest: $29.99 at ResearchChemHQ · $6.00/mg· 7 active listings

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    Best peptides for fat loss — FAQ

    What are the best peptides for fat loss?

    The top-ranked peptides for fat loss based on research evidence and current vendor pricing are: 1) Retatrutide, 2) Tesofensine, 3) Semaglutide, 4) Tirzepatide, 5) SLU-PP-332. Each is profiled below with mechanism, dosing, and the cheapest current source.

    Which peptide works fastest for fat loss?

    Onset varies by mechanism. Direct-acting compounds (e.g., metabolic agonists for fat loss, healing peptides for tissue repair) typically show effects within 2-4 weeks of consistent dosing. Adaptogenic and longevity compounds operate on slower 8-12 week timelines. Each compound profile has its own onset notes — see the linked research pages for specifics.

    Where to buy peptides for fat loss?

    BodyHackGuide tracks live vendor pricing across every compound on this page. Each row links to the buyer-intent /buy/<compound> page where vendors are ranked cheapest-first by price per mg, with active coupon codes surfaced. Trust Score rubric (0-100) filters out low-quality vendors before they're surfaced anywhere.

    Are these peptides legal to buy?

    All compounds linked here are sold by vendors for research-use-only — no prescription required for research purchases. None of the vendors on BodyHackGuide sell research compounds for human consumption. BodyHackGuide editorial doesn't promote off-label use; we provide research data so qualified researchers can make informed sourcing decisions.

    Affiliate disclosure. BodyHackGuide may earn a commission from purchases via links on this page — at no additional cost to you. Compound rankings are based on research-evidence strength and live vendor data; we don't accept payment for editorial placement. See our full affiliate disclosure .