Best peptides for muscle growth
For lean mass, hypertrophy, training recovery, strength, body composition.
Reviewed by the amino101 editorial team. , first published .
Start with the fact that reorders this whole list: no peptide builds muscle like an anabolic steroid, and the gap is not close. Growth hormone, the strongest compound here, adds a few kilograms of lean mass over months in healthy adults with no improvement in strength in controlled trials. Everything below it is weaker or untested. What peptides can do is modest: raise growth hormone and IGF-1, improve recovery and sleep, shift water and fat, and in a few cases speed the repair of a specific injury. The list is ranked by human evidence, which puts two approved drugs at the top and two compounds with no human data at the bottom. Educational ranking only.
- 1Full guideHGH (Somatropin)Extensively studied
The ceiling of the category. An approved drug with decades of data. A few kilograms of lean mass and measurable fat loss over 3 to 6 months at 2 to 4 IU, no strength gain in trials, and edema, joint pain and raised glucose as the price. Prescription only.
Dosage1 to 4 IUFrequencyonce daily, or split into two dosesRouteSubcutaneous, Intramuscular - 2Full guideTesamorelinExtensively studied
An approved GHRH analog that raises your own growth hormone with the strongest trial record of any secretagogue. Its documented effect is visceral fat, not muscle, but it moves IGF-1 into the upper normal range with the feedback loop intact.
Dosage1 to 2 mgFrequencyonce dailyRouteSubcutaneous - 3Full guideIpamorelinWell researched
The default secretagogue, almost always paired with CJC-1295 no DAC. A clean growth hormone pulse, better sleep and recovery within weeks, and a modest IGF-1 rise. No body composition trial exists; the effect is gradual rather than visible.
Dosage100 to 300 mcgFrequency1 to 3 times dailyRouteSubcutaneous - 4Full guideIGF-1 LR3Preclinical only
The most direct anabolic signal on the list and the least forgiving. A cell culture reagent with no human trial, a 20 to 30 hour half-life and a real hypoglycemia risk. Short cycles, low doses, experienced users only.
Dosage20 to 50 mcgFrequencyonce dailyRouteSubcutaneous, Intramuscular - 5Full guideBPC-157Limited research
Not a growth compound. Earns its place for muscle tears and tendon problems that stop you training, with rodent data on crush injury and tendon repair. The recovery pick, not the size pick.
Dosage250 to 500 mcgFrequencyonce or twice dailyRouteSubcutaneous, Intramuscular, Oral - 6Full guidePEG-MGFPreclinical only
Last for a reason. A pegylated copy of a muscle splice variant that expands satellite cells in culture and grows muscle in mice when the gene is delivered. No human data of any kind, and the pegylated form has not been characterized in any animal.
Dosage200 to 400 mcgFrequency2 to 3 times weekly on training daysRouteSubcutaneous, Intramuscular
For most people the answer is the secretagogue stack: CJC-1295 no DAC with ipamorelin before bed, 8 to 16 weeks, judged by sleep, recovery and IGF-1 bloodwork rather than by the mirror. Growth hormone is the stronger tool if it comes from a pharmacy and the bloodwork is in place. IGF-1 LR3 and PEG-MGF are experiments, and the HGH and LR3 pairing that bodybuilding forums describe carries a hypoglycemia risk that most people have no reason to take on. BPC-157 is for the injury that is keeping you out of the gym. Training, food and sleep do the actual building; the compounds are an educational topic here, not a plan, and the honest comparison with the drugs that do build muscle is at the peptides vs steroids article.
Dosage at a glance
What appears in research and community protocols for each pick. Every number links to the full protocol table and calculator on the compound page.
| Peptide | Dosage | Frequency | Route | Cycle | First effects |
|---|---|---|---|---|---|
| HGH (Somatropin) | 1 to 4 IU per day | once daily, or split into two doses | Subcutaneous, Intramuscular | 3 to 6 months minimum for body composition; medical replacement is ongoing | water retention and deeper sleep 1 to 2 weeks, skin and recovery 3 to 4 weeks, fat loss 8 to 12 weeks, lean mass 3 to 6 months |
| Tesamorelin | 1 to 2 mg | once daily | Subcutaneous | ongoing; reassess at 3 to 6 months with IGF-1 and waist measurements | IGF-1 rise 2 to 4 weeks, waist and visceral fat change 12 to 26 weeks |
| Ipamorelin | 100 to 300 mcg | 1 to 3 times daily | Subcutaneous | 8 to 16 weeks | deeper sleep 1 to 2 weeks, IGF-1 rise on bloodwork by 4 weeks, recovery and body composition 2 to 3 months |
| IGF-1 LR3 | 20 to 50 mcg | once daily | Subcutaneous, Intramuscular | 4 to 6 weeks | muscle fullness and pumps 1 to 2 weeks, recovery 2 to 4 weeks, any size change only over the full cycle with training and food |
| BPC-157 | 250 to 500 mcg | once or twice daily | Subcutaneous, Intramuscular, Oral | 4 to 8 weeks | pain and swelling 3 to 7 days, tendon and muscle function 2 to 4 weeks, gut symptoms 1 to 3 weeks |
| PEG-MGF | 200 to 400 mcg | 2 to 3 times weekly on training days | Subcutaneous, Intramuscular | 4 to 6 weeks | nothing to feel; any change in recovery or muscle is judged over 4 to 6 weeks and cannot be separated from training |
Side effects to expect
- ▲Fluid retention, swollen hands and feet
- ▲Joint pain and stiffness
- ▲Carpal tunnel symptoms, tingling and numb fingers
- ▲Injection site redness, itching, bruising, or irritation
- ▲Joint pain and stiffness
- ▲Swelling in the hands and feet, carpal tunnel symptoms
- ▲Headache, flushing, or lightheadedness shortly after a dose
- ▲Water retention and puffy hands at higher doses
- ▲Tingling in the fingers when stacked heavily
- ▲Hypoglycemia with shakiness, sweating, hunger, and brain fog
- ▲Headache
- ▲Water retention
- ▲Injection site redness or mild irritation
- ▲Nausea, more often with oral capsules
- ▲Headache or brief dizziness after a dose
- ▲Injection site soreness, bruising or swelling, more so with intramuscular injection
- ▲Transient lightheadedness after a dose
- ▲Mild hypoglycemia symptoms have been reported anecdotally, unverified
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Best peptides for muscle growth: frequently asked
What is the best peptide for muscle growth?
Growth hormone, if the question is which compound has the most evidence, and even that is modest: a few kilograms of lean mass over months with no strength gain in controlled trials. For most people the practical answer is CJC-1295 no DAC with ipamorelin, which raises your own growth hormone with far fewer side effects. Neither approaches what an anabolic steroid does; see peptides vs steroids for the honest comparison.
Is IGF-1 LR3 better than HGH for muscle?
It is more direct, since it delivers the IGF-1 signal itself rather than asking the liver to make it, and it is far less understood. LR3 has no human trial, a 20 to 30 hour half-life and a reliable glucose lowering effect that has caused serious hypoglycemia in community reports. Growth hormone is an approved drug with a known dose response. The head to head is at IGF-1 LR3 vs HGH.
Do CJC-1295 and ipamorelin build muscle?
Slowly and modestly, if training and food are in place, and no trial has measured it. The pair produces a growth hormone pulse several times larger than either alone, IGF-1 rises on bloodwork by week 4, and most people notice deeper sleep and faster recovery before any change in the mirror. Reported protocols use 100 mcg of each before bed on an empty stomach; the full write up is at the CJC-1295 and ipamorelin stack.
Can you take HGH and IGF-1 LR3 together?
People do, injected at different times of day because growth hormone raises blood glucose and LR3 lowers it. There is no human study of the combination, both drive IGF-1 signaling with the cell growth concern that carries, and the hypoglycemia risk is real. It is a stack for a narrow group of experienced users with bloodwork in place; the reasons most people should not are at the HGH and IGF-1 LR3 stack.
Does PEG-MGF work for muscle growth?
Nobody knows, because no human has been given it in a study. In mice, delivering the MGF gene into muscle increased fiber size, and the E peptide expands myoblasts in culture. The pegylated version sold online has no published pharmacokinetics in any species, and the days long half-life vendors claim is unmeasured. Community protocols report 200 to 400 mcg two to three times weekly after training; the comparison with the other IGF-1 family compound is at PEG-MGF vs IGF-1 LR3.
Related reading
Soft tissue and tendon injury recovery
Skin, scar and post-procedure healing
Healing with inflammation and gut support
Pulsatile growth hormone release
Visceral fat loss with growth hormone support
Gut lining repair and inflammation control
Weight loss while limiting muscle loss
Muscle growth and body composition
Which healing peptide should you start with, and do you need both?