MB1 Labs Peptides

Modified HGH Fragment

Fat Metabolism Without IGF-1: The Isolated Lipolytic Domain

AOD-9604 is a modified 16-amino-acid C-terminal fragment of human growth hormone (Tyr-hGH 177-191) with a stabilizing disulfide bridge. Unlike full HGH, AOD-9604 retains only the lipolytic domain — stimulating fat breakdown and inhibiting lipogenesis without affecting IGF-1 levels or glucose tolerance. Phase 2b trials in 300 obese individuals showed the peptide tripled weight loss compared to placebo with a safety profile indistinguishable from placebo.

  • 16-amino-acid fragment: Tyr-hGH 177-191 with disulfide bridge
  • Stimulates lipolysis (fat breakdown)
  • Inhibits lipogenesis (fat storage)
  • No meaningful IGF-1 elevation
  • Placebo-like safety profile in human trials
Multi-Pathway Mechanism

How AOD-9604 Achieves Fat Loss Without HGH Side Effects

AOD-9604 was originally thought to work exclusively via β3-adrenergic receptors on white adipose tissue. However, research in β3-AR knockout mice revealed fat loss still occurs — indicating at least two distinct mechanisms. The secondary pathway may involve direct induction of apoptosis in white fat cells. This dual-mechanism approach explains the peptide's robust efficacy while maintaining metabolic safety — no antibody formation, no insulin resistance, no glucose intolerance.

  • β3-adrenergic receptor activation (shifts fat to "usage mode")
  • Secondary pathway: Possible adipocyte apoptosis induction
  • Works even in β3-AR knockout models
  • No antibody formation (structural similarity to HGH)
  • No insulin resistance or glucose intolerance
Expanding Research Applications

From Obesity to Joint Repair and Cardiovascular Protection

Beyond fat metabolism, AOD-9604 research has expanded into unexpected territories. Intra-articular injections show synergistic effects with hyaluronic acid in osteoarthritis models — improving pain, disability, and cartilage structure at both gross and microscopic levels. Cardiovascular research suggests the peptide may improve metabolic markers beyond its obesity effects, similar to pioglitazone and acipimox — potentially through the same secondary pathway that enables β3-AR-independent fat loss.

  • Obesity: Tripled weight loss vs placebo in Phase 2b
  • Osteoarthritis: Synergy with hyaluronic acid, cartilage improvement
  • Cardiovascular: Metabolic benefits beyond fat reduction
  • Steady weight loss rate (no resistance development)
  • Novel cartilage growth pathway research

MB1 LABS VS TYPICAL PEPTIDE SELLER

Clear specs & documentation per product

Minimal product information

Standardized vial format and fill amount

Mixed packaging, unclear content

Practical storage & handling guidance

Practical storage & handling guidance

Lot number on every vial for traceability

Hard to trace individual batches

Fast, helpful support for docs & orders

Slow or generic customer support

Everything You Need to Know!

Frequently Asked Questions

A sterile, sealed vial containing a defined amount of lyophilized peptide, labeled with product name and lot number.

Yes. A COA is available for every lot and can be requested from our support team.

Each batch is analyzed using established methods (e.g. HPLC, MS) to confirm identity and purity as stated on the COA.

Store unopened vials in a refrigerator (2–8 °C), protected from light and moisture, unless otherwise indicated on the product label.

No. All MB1 Labs products are supplied strictly as laboratory reagents for research use only and are not intended for human or veterinary use, diagnostics, or therapy.


  • Third-party tested

    Independent analytical testing to verify identity and purity of each batch.

  • COAs FOR EVERY LOT

    Comprehensive Certificates of Analysis available for all released batches.

  • RESEARCH-ONLY USE

    Supplied strictly as laboratory reagents – not for human or veterinary use.

  • CONTROLLED HANDLING

    Standardized storage and handling to help preserve compound integrity.