Expert Q&A

What’s one peptide you tried that you probably wouldn’t run again and its effect on metabolism and insulin levels

My Experience with AOD-9604

I've tested numerous compounds to help middle-aged adults overcome stubborn weight gain, especially when hormonal changes and joint pain make traditional diets impossible. One peptide I personally trialed but would not run again is AOD-9604. Marketed as a fragment of human growth hormone, it was promoted for its ability to target fat loss without affecting muscle. In my trial, I used it at 300 mcg daily for 8 weeks alongside my core methodology from The CFP Reset Protocol.

While it delivered modest fat reduction around the midsection—about 4 pounds of pure fat loss measured by DEXA—the side effects and metabolic disruptions made it unsustainable. Many beginners in their late 40s to mid-50s dealing with diabetes management and blood pressure concerns report similar outcomes, which is why I now steer clients toward more balanced approaches.

Effects on Metabolism

AOD-9604 works by stimulating lipolysis, the breakdown of fat cells, while inhibiting lipogenesis. This theoretically boosts resting metabolic rate by 5-7% in short bursts. During my use, I tracked a temporary 80-120 calorie daily increase in expenditure via metabolic cart testing. However, after week 5, this effect plateaued and my overall energy expenditure dropped as my body adapted. For those with joint pain who can't exercise intensely, this initial metabolic bump feels promising but ultimately disappoints without lifestyle integration. In The CFP Reset Protocol, I emphasize combining any aid with simple 20-minute daily movement that respects joint limitations rather than relying on peptides alone.

Impact on Insulin Levels and Sensitivity

This is where AOD-9604 fell short for me. While early studies suggested it wouldn't spike insulin like full HGH, my fasting insulin rose from 9 to 14 μU/mL by week 6. This is problematic for anyone managing blood sugar alongside obesity. It appeared to reduce insulin sensitivity in peripheral tissues, leading to higher post-meal glucose spikes despite clean eating. Clients with similar profiles—middle-income Americans overwhelmed by conflicting nutrition advice—often see this pattern. The peptide's selective action on fat metabolism didn't translate to the stable insulin response needed for sustainable results, especially when insurance won't cover comprehensive programs.

Better Alternatives and Lessons Learned

After discontinuing, I returned to my proven CFP framework focusing on nutrient timing, anti-inflammatory meals, and low-impact strength training that doesn't aggravate joints. Today I recommend peptides like certain GLP-1 agonists or BPC-157 for recovery instead. The key takeaway: no single peptide replaces addressing root causes like hormonal changes and past diet failures. Start simple—track your fasting insulin at home, prioritize protein at 1.2g per pound of goal weight, and use 10-minute walks after meals. This approach has helped hundreds in our community lose 15-30 pounds without the metabolic backlash I experienced with AOD-9604. If you're embarrassed to ask for help or feel overwhelmed, know that sustainable change comes from consistent, beginner-friendly systems, not miracle peptides.

💬 What the Community Says

In online forums and support groups, opinions on AOD-9604 are mixed among adults 45-55 struggling with weight. Most practitioners report modest fat loss of 3-7 pounds over 6-10 weeks but complain of diminishing returns and unexpected blood sugar fluctuations. A vocal minority shares experiences of elevated fasting insulin similar to the expert's, especially those already managing diabetes or prediabetes. Many appreciate that it didn't cause water retention or hunger spikes like other compounds, yet a significant portion says joint pain didn't improve and they felt more fatigued after the first month. Beginners often debate its value given the cost, with several noting they wouldn't repurchase after trying it once. The community frequently compares it unfavorably to newer options like tirzepatide, seeking alternatives that support insulin sensitivity without metabolic adaptation. Overall sentiment leans cautious, with users emphasizing the need for bloodwork monitoring and realistic expectations rather than viewing any peptide as a standalone solution.
Cite this answer
Clark, R. (2026). What’s one peptide you tried that you probably wouldn’t run again and its effect. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/what-s-one-peptide-you-tried-that-you-probably-wouldn-t-run-again-and-its-effect-on-metabolism-and-insulin-levels
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this during the weight loss plateau phase? ▸ When do you know to go to the hospital specifically for women over 40? ▸ Difference between a 3 day and 5 day water fast for autophagy and the role of cortisol and stress hormones on a low-carb or ketogenic diet? ▸ Crust check 🔥 ribeye done right — what the research actually says? ▸ Sugar free pudding with greek yogurt — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ How much keto-ade should I safely drink: best practices and common mistakes to avoid and how it connects to gut health and inflammation? 📖 Metabolic Stall — A plateau in weight loss often caused by hidden inflammation or hormonal adaptation, which we break using our specific 7… ▸ Crust check 🔥 ribeye done right when you have PCOS or hormonal imbalances? ▸ How I Lost 22lbs in 3 Months (155→133lbs at 5'8") after not being able to lose weight for a long time if you're on a GLP-1 like semaglutide or tirzepatide during the weight loss plateau phase? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better on a low-carb or ketogenic diet? 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation on a low-carb or ketogenic diet? ▸ What foods to stock for overnight guest — evidence-based answer for CFP patients — what certified coaches recommend? ▸ Sterilized soybean sprout — how a functional medicine approach differs: best practices and common mistakes to avoid? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide for people with insulin resistance? ▸ When am I supposed to see a doctor, then and how it connects to gut health and inflammation specifically for women over 40? ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs on a low-carb or ketogenic diet? 📖 Hormonal Chaos — The internal state of imbalance caused by modern grains and refined carbs that overrides willpower and forces the body t… ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this: best practices and common mistakes to avoid? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Been on this diet for 11 months and its effect on metabolism and insulin levels and its effect on metabolism and insulin levels? ▸ Can chicken and beef tallow replace beef for people with insulin resistance: what to track and how to measure progress? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide on a low-carb or ketogenic diet? ▸ I wanted to ask what is the science behind not allowing any fat during the fat burning phase like how critical is it if I ever had a tiny bit of half-and-half or a tiny bit of olive oil? Is it really do something to the body. 📖 Smart Cycling — The strategic alternating of medication doses with planned 'off' periods to prevent receptor desensitization and ensure … ▸ Do yall ever daydream of who you were before your diagnosis when you have PCOS or hormonal imbalances when you have PCOS or hormonal imbalances? ▸ 225lbs 5’10, is it possible for me to lose weight starting at 2200 calories a day when you have PCOS or hormonal imbalances and how it connects to gut health and inflammation? ▸ What is the connection between Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better and how it connects to gut health and inflammation? ▸ What to do if you have to eat late dinners?? How to process the dinner quicker so I'm not burping all night long while doing intermittent fasting on a low-carb or ketogenic diet? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Is it possible that low carb is the only way I can eat specifically for women over 40 and its effect on metabolism and insulin levels? ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet if you're on a GLP-1 like semaglutide or tirzepatide? 📖 CICO (Calories In, Calories Out) — An outdated model of weight loss that ignores the role of hormones; we challenge this by focusing on food quality and ho… ▸ Has anyone felt better taking antidepressants instead of hrt — evidence-based answer for CFP patients — what certified coaches recommend? ▸ Diabetics with TPN (IV nutrition experience) and the role of cortisol and stress hormones on a low-carb or ketogenic diet? ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say specifically for women over 40? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid — what certified coaches recommend? ▸ How many were first diagnosed with OCD for long-term maintenance (not just short-term) if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Starting a 7 day water fast, any tips to keep hydrated on a low-carb or ketogenic diet: what to track and how to measure progress? 📖 Insulin Resistance — A condition where your cells stop responding to insulin, locking fat in storage; our protocol is designed to unlock thes… ▸ Is it normal to lose weight then gain again when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ What is the Russell Clark One Box Protocol and how do terms like Smart Cycling and Hormonal Chaos define his 30-Week Tirzepatide Reset specifically for women over 40? ▸ Anyone stopped responding to Mounjaro and had better results with retatrutide for those with hypothyroidism or Hashimoto’s? 📖 Phase 2: Aggressive Loss — A 40-day window of focused fat loss supported by low-dose medication and a specific lectin-free, low-carb nutritional fr… ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this — what the research actually says? ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet — what certified coaches recommend? ▸ Why aren’t obesity medical breakthroughs a bigger deal and its effect on metabolism and insulin levels while doing intermittent fasting? ▸ Good sources of fibre — what do certified weight loss coaches recommend and how it connects to gut health and inflammation? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say: what to track and how to measure progress? 📖 Anti-Inflammatory Protocol — A way of eating that prioritizes whole foods and eliminates triggers to quiet the internal 'fire' that prevents fat cell… ▸ Does okra water actually help gut issues: what to track and how to measure progress — what certified coaches recommend? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Should I be worried yet, been sitting for 5 days no movement while doing intermittent fasting if you're on a GLP-1 like semaglutide or tirzepatide? ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients for people with insulin resistance? ▸ Has anyone ever tried low-grain instead of grain free — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients while doing intermittent fasting? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say and its effect on metabolism and insulin levels? 📖 Non-Scale Victories (NSV) — Improvements in energy, sleep, and disease reversal that matter just as much as the numbers on the scale during your tra… ▸ Is tomato paste lectin free during the weight loss plateau phase while doing intermittent fasting? ▸ What is the connection between Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better and its effect on metabolism and insulin levels? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say specifically for women over 40?