AOD-9604
A modified fragment of human growth hormone that targets fat cells for breakdown without affecting blood sugar or muscle growth—your metabolism's precision tool.
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team
Suggested dose
250 – 500 mcg
Compound profile
Scientific & efficacy data
Weight Management
Peptide profile
Moderate human trials
AOD-9604
250 mcg · Once daily
Molecular formula
C78H123N23O23S2
- Mol. weight
- 1815.1 g/mol
- CAS number
- 221231-10-3
- PubChem
- 71300630
- Developed · 1997
- Frank Ng
Monash University / Metabolic Pharmaceuticals
Amino acid sequence
Tyr-Leu-Arg-Ile-Val-Gln-Cys-Arg-Ser-Val-Glu-Gly-Ser-Cys-Gly-PheFat Targeting
Specifically targets fat cells through beta-3 receptor activation without affecting muscle, blood sugar, or other tissues—one of the most selective fat-targeting compounds available
Safety Profile
Extensive human clinical trial data showing excellent tolerability with no effect on glucose metabolism, insulin levels, or IGF-1—safer than full HGH for metabolic support
Joint Support
Emerging research demonstrates cartilage regeneration properties, with animal studies showing enhanced joint repair especially when combined with hyaluronic acid
Dosing
How much do I take?
250 – 500 mcg · once daily
250 – 500 mcg
Once daily
Covers all 3 documented dose levels · timing · dose-adjustment guidance.
Suitability
Is this right for me?
Best for fat loss & body composition improvement
Best for
Targeted Fat Loss
AOD-9604 shines when you want to target stubborn fat deposits. It works by mimicking how growth hormone breaks down fat, but without the side effects of actual HGH. Think of it as a smart missile that targets fat cells specifically.
Body Recomposition
Perfect for those who want to lose fat while maintaining muscle. Unlike many fat loss compounds, AOD-9604 doesn't affect muscle tissue or mess with your blood sugar levels—it's laser-focused on fat metabolism.
Metabolic Enhancement
Ideal for boosting your metabolism naturally. AOD-9604 increases fat oxidation (your body's ability to burn fat for fuel) without the jittery stimulant effects of caffeine or other thermogenics.
Joint Health Support
Emerging research shows AOD-9604 may help repair cartilage and support joint health. Studies in osteoarthritis models show it can reduce cartilage damage, making it a dual-purpose peptide for active individuals.
Metabolically Safe Fat Loss
Unlike many weight loss compounds, AOD-9604 doesn't raise blood sugar, doesn't affect insulin, and doesn't stimulate cell growth. It's one of the gentlest approaches to enhancing fat metabolism available.
Consider alternatives if
Do not use if
Use with caution if
Not sure?
Compare AOD-9604 with similar peptides to find the best fit for your goals.
Administration
How do I use it?
Subcutaneous injection
Route
Subcutaneous injection into fatty tissue
Best sites
Covers reconstitution · step-by-step technique · storage · a sample daily schedule.
Safety
Is it safe?
3 common side effects · 2 serious
AOD-9604 has been studied in multiple human clinical trials involving thousands of participants.
The safety profile is notably clean—it doesn't affect blood sugar, insulin levels, or cause the typical side effects of growth hormone. Phase 2 trials showed it was well-tolerated even at doses higher than typically used. The most common side effects are mild and injection-site related.
Metabolic Pharmaceuticals invested over $50 million in research, generating extensive human safety data. Multiple Phase 1-2 trials demonstrated excellent tolerability. The compound received GRAS (Generally Recognized as Safe) status for oral use in some jurisdictions.
However, Phase 3 trials for obesity were not completed.
Common side effects · experienced by some users
Injection site reactions
Redness, minor swelling, or tenderness at the injection site that typically resolves within hours
Management: Rotate injection sites, ensure proper technique, apply ice if needed
Mild headache
Occasional headache, especially in the first few days of use
Management: Stay well hydrated, usually resolves with continued use
Flushing or warmth
Temporary flushing sensation after injection, lasting minutes
Management: This is normal and harmless—resolves quickly on its own
Less common
These typically resolve with continued use or dose adjustment.
Stop and seek help if
- Signs of allergic reaction (rash, swelling, difficulty breathing)
- Persistent side effects that don't improve after dose reduction
- Pregnancy confirmed or suspected
- Development of any new medical condition—consult your provider
- No noticeable benefits after 8-12 weeks of consistent use
- Prior to any surgical procedure—discuss timing with your surgeon
Always consult with a healthcare provider before stopping or if you experience any concerning symptoms. This information is for educational purposes and should not replace professional medical advice.
With other peptides
- Safe:CJC-1295 — Excellent synergy for fat loss—can be injected together
- Safe:Ipamorelin — Commonly stacked for body recomposition—complementary mechanisms
- Safe:BPC-157 — Safe to combine; different mechanisms, no interaction concerns
- Safe:TB-500 — Safe combination for those seeking fat loss plus recovery benefits
- Caution:Human Growth Hormone (HGH) — Generally not combined—AOD-9604 mimics part of HGH's action
With medications
- Safe:Insulin — AOD-9604 does not affect blood sugar, but monitor if diabetic
- Safe:Diabetes medications — No known interactions, but monitor blood sugar as always
- Safe:Blood thinners — Use caution—may slightly increase bruising at injection sites
- Safe:Thyroid medications — No known interactions, safe to use together
With supplements
- Safe:L-Carnitine — May enhance fat oxidation effects—good synergy
- Safe:Caffeine/Thermogenics — Safe to combine for enhanced fat loss, but not necessary
- Safe:Fish oil/Omega-3s — Safe and may support overall metabolic health
- Safe:Protein supplements — Recommended to support muscle preservation during fat loss
Effectiveness
How do I know it's working?
Moderate human trials · first signs week 1-2
Evidence level
Moderate human trials
(Phase 1-2)
Regulatory status
Not FDA approved
Onset of effects
Gradual
(3-4 weeks)
How it works
AOD-9604 is like a tiny piece of growth hormone that only does one job: tell your fat cells to release their stored fat.
Your body naturally uses growth hormone to burn fat, but full HGH comes with side effects like blood sugar problems and unwanted growth. Scientists figured out which part of growth hormone handles fat-burning and made AOD-9604 from just that piece.
So you get the fat-burning signal without any of the other effects—your blood sugar stays normal, and you don't grow bigger hands or feet!
The deeper mechanism
AOD-9604 is the C-terminal fragment (amino acids 177-191) of human growth hormone with an N-terminal tyrosine substitution for stability. Unlike full HGH, it does not bind to the growth hormone receptor and does not stimulate IGF-1 production.
Its primary mechanism involves upregulation of beta-3 adrenergic receptors on adipocytes, which enhances catecholamine-stimulated lipolysis. It also inhibits lipogenesis through suppression of fatty acid synthase activity.
The peptide has an extremely short plasma half-life (~3 minutes), but its effects on receptor expression and enzyme activity persist much longer.
Research indicates it acts on adipocyte-specific pathways without systemic metabolic effects, which explains its excellent safety profile regarding glucose metabolism and insulin sensitivity.
The disulfide bridge between Cys-7 and Cys-14 maintains structural integrity essential for biological activity.
What to expect
Week 1-2
What you might notice
- Getting used to the injection routine
- Possibly mild injection site reactions (normal)
- No dramatic changes yet—this is expected
- Perhaps subtle increase in energy during fasted morning
What's normal
- Not seeing visible fat loss yet
- Minor redness at injection sites
- Feeling exactly the same as before
What's next
- Continue consistent daily dosing
- Maintain your diet and exercise routine
- Track your starting measurements and photos
Week 3-4
What you might notice
- Subtle changes in how clothes fit
- Possibly noticing slightly more definition
- Body may be responding to enhanced fat oxidation
- Energy levels during fasted cardio may improve
What's normal
- Changes are gradual—not dramatic transformations
- Scale weight may not change much (fat loss, water shifts)
- Some days feel more effective than others
What's next
- Consider increasing dose to 300-400mcg if tolerating well
- Continue tracking measurements
- Stay consistent with timing and fasted administration
Week 5-8
What you might notice
- More noticeable fat loss, especially in stubborn areas
- Improved body composition visible in mirror
- Clothes fitting noticeably looser in problem areas
- Enhanced results from your workout program
What's normal
- Fat loss is gradual—typically 0.5-1 lb fat per week
- Results vary based on diet and exercise consistency
- Some areas respond faster than others
What's next
- Continue at current dose if seeing progress
- May increase to 500mcg if needed and tolerating well
- Reassess at week 8 to decide on continuation
Week 9-12+
What you might notice
- Significant improvement in body composition
- Stubborn fat areas showing real reduction
- Potentially 3-6+ pounds of fat lost (with proper diet)
- Better muscle definition as fat decreases
What's normal
- Rate of fat loss may slow as you get leaner
- Results plateau if diet isn't optimized
- Some users continue beyond 12 weeks
What's next
- Evaluate results and decide on continuing or taking a break
- Some users cycle off for 4-6 weeks before resuming
- Maintain results with diet and exercise during breaks
Signs it's working
Fat Loss Progress
- Gradual reduction in body fat percentage
- Clothes fitting looser, especially around midsection
- Visible improvement in stubborn fat areas
- Better muscle definition becoming apparent
- Progress photos showing real differences over time
Metabolic Response
- Improved energy during fasted exercise sessions
- Body responding better to your fat loss diet
- Enhanced fat oxidation during cardio (feeling warmer)
- Maintaining muscle while losing fat
- Stable energy levels throughout the day
Joint Health (if applicable)
- Reduced joint discomfort during exercise
- Improved mobility and flexibility
- Less stiffness after workouts
- Better recovery from joint stress
Not seeing results? Common reasons
- Not taking on an empty stomach—fat and food reduce effectiveness
- Inconsistent dosing—daily consistency is important
- Dose too low—may need to increase to 400-500mcg
- Diet not optimized—AOD-9604 enhances fat loss but doesn't replace caloric deficit
- Not enough time—real results take 6-8+ weeks of consistent use
- Poor peptide quality—ensure you're getting from a reputable source
- Expectations too high—AOD-9604 is a gentle compound, not a dramatic fat burner
Key research
Clinical trials
Tested in people
No registered clinical trial of AOD-9604 was found in the public registries.
That does not mean nobody has studied it — laboratory and animal work is not registered anywhere. It means no study has been declared in advance where regulators and the public can see it, so there are no stated endpoints and no results anyone is obliged to report.
Questions
Frequently asked
How is AOD-9604 different from HGH for fat loss?
AOD-9604 is just the fat-burning piece of HGH without the rest. Full HGH can raise blood sugar, cause water retention, joint pain, and even make your hands and feet grow. AOD-9604 only targets fat cells, so you get fat loss without those side effects. It also doesn't increase IGF-1 levels, making it a more targeted, safer option.
How long until I see results from AOD-9604?
Most people start noticing subtle changes around weeks 3-4 and more significant results by weeks 6-8. Remember, AOD-9604 is a gentle compound—it enhances your body's natural fat burning rather than forcing dramatic changes. Combined with proper diet and exercise, expect gradual but steady fat loss.
Do I need to diet while using AOD-9604?
Yes! AOD-9604 enhances fat metabolism, but it doesn't magically eliminate the need for a caloric deficit. Think of it as a tool that makes your fat loss diet more effective. You'll still need to eat less than you burn—AOD-9604 just helps your body access and burn stored fat more efficiently.
Why does AOD-9604 need to be taken on an empty stomach?
AOD-9604 has a very short half-life (just a few minutes in your blood), so you want maximum absorption when you inject it. Food, especially fat, can interfere with peptide absorption. Taking it fasted ensures the peptide gets into your system efficiently before your body starts dealing with digestion.
Can I use AOD-9604 with other peptides?
Absolutely! AOD-9604 stacks well with growth hormone releasing peptides like Ipamorelin and CJC-1295 for enhanced body recomposition. It can also be combined with healing peptides like BPC-157 or TB-500 if you have recovery goals. Just avoid combining it with actual HGH since they'd be redundant.
Is AOD-9604 FDA approved?
No, AOD-9604 is not FDA approved for any use in the United States. It underwent Phase 1 and Phase 2 clinical trials for obesity, which showed it was safe and well-tolerated, but Phase 3 trials were not completed. It's currently available as a research peptide or through compounding pharmacies in some regions.
Will AOD-9604 affect my blood sugar or make me diabetic?
No—this is one of AOD-9604's biggest advantages. Unlike full growth hormone, AOD-9604 does not affect blood sugar, insulin sensitivity, or glucose metabolism. Multiple clinical studies confirmed this. It was specifically designed to provide fat loss benefits without the metabolic side effects of HGH.
Can AOD-9604 help with joint pain?
Emerging research suggests yes! Studies in osteoarthritis models show AOD-9604 can help repair cartilage and reduce joint damage. When combined with hyaluronic acid, the effects were even better. While more research is needed, some people use AOD-9604 specifically for joint support in addition to fat loss.
Further reading
History & related research
Studied for
Ready for the protocol?
Every dosing tier, administration route, timing note, and dose-adjustment rule for AOD-9604, on one page.