Fragment 176-191

Preclinical Research

Growth Hormone Releasing Peptide Fragment 176-191

The fat-regulating tail fragment of human growth hormone. Studied for lipolysis (fat breakdown) without the growth-promoting effects of full GH.

SubQ injectionWeight ManagementBody Composition

Dose

200-500 mcg

Route

SubQ injection

Cycle

8-12 weeks

Storage

Refrigerated (2-8°C / 36-46°F) away from light.

What is Fragment 176-191?

Fragment 176-191 is a synthetic peptide representing the C-terminal fragment of human growth hormone (hGH). It comprises amino acid residues 176-191 of the full hGH sequence. Research indicates that this fragment is responsible for the fat-reducing effects of hGH without inducing the growth-promoting effects or impacting insulin sensitivity and glucose levels. It is hypothesized to selectively bind to receptors in adipose tissue, leading to increased lipolysis (fat breakdown) and inhibition of lipogenesis (fat formation). Its mechanism of action is often compared to AOD-9604 due to their similar C-terminal hGH origins.

Key Benefits

  • Fat burning
  • Lipolysis stimulation
  • No effect on blood sugar or IGF-1
  • Body composition improvement

Mechanism of Action

  • Binds fat cells
  • Stimulates fat breakdown
  • Inhibits fat formation
  • Similar mechanism to AOD-9604

Best For

  • Fat loss research
  • Body composition

Body Systems

MetabolicAdipose (Fat Tissue)

🐾 Griffin Says...

Similar to AOD-9604 in concept. Both are fragments of GH targeting fat. HGH Fragment 176-191 has a slightly longer research history. Neither will make you grow taller or mess with your insulin, which makes them interesting for targeted fat research.

Molecular Information

Molecular weight

1817.1 g/mol

Length

16 amino acids

Type

Peptide

Amino acid sequence

YLRIVQCRSVEGSCGF

Tyrosine-Leucine-Arginine-Isoleucine-Valine-Glutamine-Cysteine-Arginine-Serine-Valine-Glutamic acid-Glycine-Serine-Cysteine-Glycine-Phenylalanine

Pharmacokinetics

Half-life

0.5 h

Time to clear

Approximately 1.5-2.5 hours

DoseEstimated plasma concentration3 h

Based on studies on similar GH fragments and general peptide pharmacokinetics.

Research Indications

  • Lipolysis Stimulation

    Fragment 176-191 is studied for its ability to stimulate the breakdown of fat cells (lipolysis), leading to the release of fatty acids for energy.

  • Inhibition of Lipogenesis

    Research suggests it may also inhibit the formation of new fat cells and prevent the conversion of non-fatty food materials into body fat.

Research Protocols

GoalDoseFrequencyRoute
General Fat Loss & Body Composition Improvement200-250 mcg2 times dailySubcutaneous injection
Accelerated Fat Loss (More Intensive Protocol)300-500 mcg1-2 times dailySubcutaneous injection
Maintenance or Mild Fat Loss Support200 mcg1 time dailySubcutaneous injection
Pre-Cardio Fasted State Lipolysis200-250 mcgOnce daily, 30-60 minutes before fasted cardioSubcutaneous injection

Administration in a fasted state is commonly discussed to optimize its potential effects on fat metabolism, as food intake (especially carbohydrates) can cause an insulin response that might blunt its lipolytic action.

Peptide Interactions

  • Insulin

    While Fragment 176-191 does not significantly affect blood glucose, insulin promotes fat storage. Administering Fragment 176-191 in a fasted state and separate from insulin administration is commonly discussed to avoid counteracting effects.

    Use Caution
  • Other GH-Releasing Peptides (e.g., GHRP-2, GHRP-6, Ipamorelin, CJC-1295)

    Fragment 176-191 has a distinct mechanism of action, directly targeting fat cells, whereas GHRPs and GHRHs stimulate endogenous GH release. They are often discussed for use in combination without direct interference, potentially offering complementary effects.

    Compatible
  • Oral Hypoglycemic Agents (for diabetes)

    Although Fragment 176-191 is not known to impact blood sugar, individuals on diabetes medication should monitor their blood glucose closely when introducing new compounds.

    Monitor Combination
  • Corticosteroids

    Corticosteroids can promote fat storage and oppose lipolysis. While not a direct interaction, simultaneous use might reduce the efficacy of Fragment 176-191's fat-reducing effects.

    Use Caution

How to Reconstitute

  1. 1Gather materials: lyophilized peptide vial, bacteriostatic water, sterile syringe, and alcohol wipes.
  2. 2Remove the plastic cap from the peptide vial and wipe the rubber stopper with an alcohol wipe.
  3. 3Wipe the top of the bacteriostatic water vial with an alcohol wipe.
  4. 4Draw the desired amount of bacteriostatic water (e.g., 1-2 mL) into the syringe.
  5. 5Slowly inject the bacteriostatic water into the peptide vial, aiming the stream against the side of the vial, not directly onto the peptide powder.
  6. 6Do not shake the vial. Gently swirl the vial to aid dissolution. If undissolved particles remain, allow it to sit in the refrigerator for a few minutes and swirl again.
  7. 7Once fully dissolved, store the reconstituted solution in the refrigerator.

Always reconstitute with bacteriostatic water for injection. Use a sterile technique.

What to Expect

  • Weeks 1-2: Initial observations may include subtle changes in energy levels or a slight decrease in appetite. No significant body composition changes are typically seen yet.
  • Weeks 3-6: Users may begin to notice slight reductions in body fat, particularly around the abdominal area, assuming adherence to a calorie-controlled diet and exercise.
  • Weeks 7-12: More noticeable improvements in body composition, including further fat loss and potentially increased lean mass definition, may become apparent. Optimal results often require consistent use alongside appropriate lifestyle choices.
  • Post-cycle: Benefits are generally maintained if a healthy diet and exercise regimen continue. Rebound fat gain is possible if lifestyle habits revert.

Side Effects & Safety

EffectFrequencySeverity
Injection site irritationCommonMild
HeadacheUncommonMild

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Peptides discussed here are for research purposes only. Nothing on this page is medical advice. Always consult a qualified professional before making health decisions.