Hunger Hormone Modulation

Introduction

Several research peptides act on ghrelin, the main hunger hormone (see our appetite regulation overview).

Key Hunger Hormones

Ghrelin (Hunger Hormone)

Factor	Effect	Peptide Interaction
Elevated levels	Increased hunger	GHRP-6 mimics it
Reduced levels	Decreased hunger	Little peptide data
Timing	Rises before meals	Follows meal schedule
Bodyweight regulation	Complex role	Still debated

Leptin (Satiety Hormone)

Factor	Effect	Considerations
Elevated levels	Reduced hunger	Resistance can develop
Low levels	Increased hunger	Dieting concern
Peptide effects	Generally minimal direct	Indirect via composition

Peptide Effects on Appetite

GH Secretagogues

Peptide	Appetite Effect	Mechanism	Evidence
GHRP-6	Strong increase	Ghrelin mimetic	User reports
GHRP-2	Moderate increase	Ghrelin receptor agonist	Human studies
Ipamorelin	Minimal effect	Selective GH release	No human data found
Hexarelin	Moderate increase	Similar to GHRP-6	Rat studies

Fat Loss Peptides

Peptide	Appetite Effect	Evidence
Fragment 176-191	Neutral	Mostly studied as AOD-9604
Tesamorelin	Minimal	Approved for HIV lipodystrophy only
Melanotan II	Appetite suppression	Small trials only
AOD-9604	Neutral	Failed human trials

FDA's 2024 review found most AOD-9604 trials no better than placebo; see our AOD-9604 profile.

GLP-1 Drugs

Prescription semaglutide lowers calorie intake, likely via appetite (Wegovy label). As of October 2026, FDA has approved the Wegovy pill (December 2025) and Wegovy HD (7.2 mg weekly, March 2026); see satiety enhancement.

Strategic Use

These are user practices, not tested protocols.

For Bulking

Strategy	What users report
Appetite-stimulating peptides	GHRP-6 before meals
Timing	30 minutes before meals
More hunger	Easier caloric surplus

For Cutting

Strategy	What users report
Skipping GHRP-6	Switching to ipamorelin
Dosing away from meals	Less noticeable hunger
Appetite suppressants	If hunger is a problem