Growth hormone
The master hormone that acts as your body's repair crew—building lean muscle, burning stubborn fat, strengthening bones, and helping you recover like you did in your younger years.
Start here
Human growth hormone (HGH) is the hormone the pituitary (the master hormone gland at the base of the brain) gland — a pea-sized gland at the base of the brain — produces to drive growth, tissue repair, muscle building, and fat metabolism 1. The body's output falls with age, dropping roughly 14% per decade after 30 8. The pharmaceutical version (somatropin) is FDA-approved, but for specific medical conditions; other uses are not approved.
Think of growth hormone as your body's master builder and repair crew. It's made by your pituitary (the master hormone gland at the base of the brain) gland (a pea-sized gland at the base of your brain) and tells your body to grow, repair tissues, burn fat, and build muscle 1. When you're young, you make plenty of it—that's why kids heal so fast and teenagers can eat anything without gaining weight. But after age 30, your GH levels drop about 14% every decade 8. By replacing what's been lost, HGH therapy can help your body repair and rebuild like it did when you were younger.
Human growth hormone (somatropin) is a protein chain of 191 amino acids. Somatotroph cells in the front part of the pituitary (the master hormone gland at the base of the brain) gland make it. It works in two ways: directly, and indirectly through insulin-like growth factor-1 (IGF-1 (a growth signal your liver releases in response to growth hormone)), which is made mainly in the liver. Its direct actions include lipolysis (fat breakdown), by switching on hormone-sensitive lipase (a fat-cutting enzyme), plus more protein building and release of stored sugar 13. IGF-1 handles most of the building effects: it makes cartilage cells multiply, builds muscle protein, and grows bone by stimulating osteoblasts (bone-building cells). GH is released in pulses, with the biggest peaks during slow-wave sleep (deep sleep). Two brain signals control it: hypothalamic (the brain region that runs your hormone system) GHRH pushes release up, and somatostatin (the hormone that switches growth hormone release off) pushes it down 9. Injected GH raises IGF-1 in the blood, helps the body hold on to nitrogen (a sign of protein building), shifts the body toward burning fat for fuel, improves collagen making, and supports immune function through effects on the thymus (an immune organ). Its effects on metabolism interact in complex ways with insulin, which explains why doses above normal body levels can cause glucose intolerance (trouble handling blood sugar) 13.
Evidence check
Well studied in people
This has been through large human trials — the strongest kind of evidence. Scientists have tested it on many people and measured what actually happened.
Every numbered marker on this page links to one of the 20 sources at the bottom.
Body Composition
One of the most effective compounds for simultaneously building lean muscle and reducing body fat, particularly visceral abdominal fat
Recovery & Healing
Significantly accelerates tissue repair, wound healing, and workout recovery by enhancing protein synthesis and cellular regeneration
Anti-Aging Effects
Restores youthful hormone levels leading to improved energy, skin quality, sleep, and overall vitality
The most-asked question
Human Growth Hormone (HGH) is dose-escalated: the studies start everyone low and step the dose up on a schedule, so the right amount depends on the week you're on. The research-reported maintenance range is 0.1–0.2 mg/day, once daily.
First 1-2 months, before the dose is adjusted
0.15-0.30 mg/day (approx. 0.2 mg/day)
FDA-labeled non-weight-based starting dose for adult growth hormone deficiency (Genotropin) 6. Lower starting doses and smaller increments are advised for older patients 6.
Adjusted every 1-2 months
Adjust by 0.1-0.2 mg/day up to the target dose (commonly 0.2-0.6 mg/day)
Dose titrated (stepping the dose up gradually) every 1-2 months to clinical response and serum IGF-1 (a growth signal your liver releases in response to growth hormone) per FDA label 6.
Dose adjusted step by step at 4-8 week intervals
Not more than 0.04 mg/kg/week initially, up to 0.08 mg/kg/week
FDA-labeled weight-based regimen ceiling for adult GH deficiency (Genotropin) 6.
The ceiling: 4 IU daily for most wellness/anti-aging purposes (higher doses require medical supervision and monitoring) 6
Reconstitution, in plain words
Peptides usually arrive as a freeze-dried powder in a small vial. “Reconstitution” just means adding sterile water back in so you can measure a dose. Here's how it works for Human Growth Hormone (HGH):
If you have a 10 IU vial and add 1mL of BAC water, you get 10 IU/mL. Each 0.1mL (10 units on an insulin syringe) equals 1 IU of HGH. For a 2 IU dose, you'd draw 0.2mL (20 units).
For a 2 IU dose at 10 IU/mL concentration: draw 0.2mL (20 units on a standard insulin syringe with 100 unit markings). Always double-check your math—HGH is expensive and you don't want to waste it or underdose.
Three quick questions — your vial, your water, your dose — and it tells you the exact syringe mark. “Find dose amount” is preloaded with Human Growth Hormone (HGH)'s recorded schedule.
Injection sites & technique
Subcutaneous (under the skin) injection (into the fat layer just under the skin)—the most common and easiest method for self-administration
Timing
Most people inject first thing in the morning on an empty stomach, or before bed. Morning dosing mimics your body's natural GH pulse and avoids potential sleep disruption. Evening/bedtime dosing can enhance the natural nighttime GH surge during deep sleep 89.
Best taken on an empty stomach. Insulin and blood sugar spikes from food can blunt HGH's effects. Wait at least 30-60 minutes after injection before eating, especially carbohydrates. Some users inject 2-3 hours after their last meal.
If combining with peptides like CJC-1295 or Ipamorelin, you can inject at the same time but use different sites. Space HGH away from meals by at least 30 minutes. If using insulin (only under medical supervision), timing becomes critical—consult a physician 16.
The honest list
These show up most often. They usually fade as your body adjusts.
Fluid retention in hands, feet, and ankles is one of the most common early side effects 612. Your rings might feel tighter and your shoes snugger.
What to do Usually resolves after 2-4 weeks as your body adjusts. Reduce sodium intake, stay hydrated, and consider a mild diuretic if bothersome. Lowering the dose helps.
Aching in joints (especially fingers, wrists, and knees) and muscles is common, particularly in the first few weeks 612. It's similar to growing pains.
What to do Start with a lower dose and increase gradually. Anti-inflammatory supplements like fish oil may help. Symptoms typically improve as your body adapts.
Numbness, tingling, or weakness in the hands due to fluid pressing on the median nerve in the wrist 612. More common at higher doses 6.
What to do Reduce dose or split into two daily injections. Wrist splints at night can help. Usually resolves when dose is lowered.
Mild to moderate headaches are common in the first few weeks as your body adjusts to increased GH levels 6.
What to do Stay well-hydrated, manage stress, and give your body time to adapt. Persistent or severe headaches should prompt a dose reduction and medical evaluation.
Worth knowing about, but most people never see these.
HGH can increase insulin resistance and raise fasting blood glucose levels, especially at higher doses or with prolonged use 613.
What to do Monitor blood sugar regularly. Maintain a healthy diet low in refined carbs. Some users add metformin under medical supervision to help manage glucose.
Breast tissue enlargement in men, potentially due to hormone changes 12. More common at higher doses or in combination with other hormones.
What to do Reduce dose. If combining with testosterone, ensure proper estrogen management. Consult an endocrinologist if symptoms persist.
Rare, but if any of these happen, stop and contact a medical professional.
Increased pressure inside the skull causing severe headaches, vision changes, nausea, or vomiting 6. Rare but requires immediate attention.
What to do STOP HGH immediately and seek emergency medical care. This is a serious condition that needs professional evaluation and treatment.
Week by week
Is it right for you?
Human Growth Hormone is a prescription medication in most countries. This information is for educational purposes only and does not constitute medical advice. Always work with a qualified healthcare provider before starting, stopping, or adjusting HGH therapy. Regular monitoring through blood tests is essential for safe use.
Complex interaction that needs expert management. HGH increases insulin resistance (your body responds less to insulin) while insulin lowers blood sugar. Only combine under direct medical supervision with careful monitoring 613.
Corticosteroids can reduce how well HGH therapy works. May need dose adjustment. Tell your doctor if you take both.
HGH can increase conversion of T4 to T3 (thyroid hormones). May need a thyroid dose change. Monitor thyroid function during HGH therapy 196.
HGH can raise blood sugar, potentially requiring adjustment of diabetes medications. Monitor glucose closely and work with your doctor 6.
Commonly combined to raise overall GH levels. These peptides trigger your natural GH release while HGH adds hormone from outside. Can be used together but monitor total GH exposure.
Excellent combination for healing and recovery. BPC-157 works through different routes and complements HGH's tissue repair effects. Use different injection sites.
Works together for tissue repair and recovery. Both promote healing through complementary routes. Safe to combine with different injection sites.
Both increase IGF-1 (a growth signal your liver releases in response to growth hormone) activity (IGF-1 is the growth signal that GH sets off). Combining may lead to too-high IGF-1 levels. Use with caution and monitor IGF-1 levels closely.
Often used together to help manage blood sugar effects of HGH. May also have anti-aging synergy. Generally considered a smart combination.
Safe and beneficial to take together. Both support bone health and overall wellness.
Safe combination that may help with joint pain side effects and provides cardiovascular benefits.
Safe and supportive. These minerals support hormone production and may enhance HGH benefits.
HGH naturally declines as you age—by 60, you may have only 20% of what you had at 20. Replacement therapy can help restore youthful energy, improve skin quality, maintain muscle mass, and support overall vitality 7. Think of it as giving your body back the building blocks it's been missing.
HGH is one of the few compounds that helps you build lean muscle while simultaneously burning fat 2. It enhances protein synthesis for muscle growth while mobilizing fat stores for energy. The result? A leaner, more muscular physique—especially when combined with proper training and nutrition.
Whether you're recovering from surgery, a sports injury, or just intense training, HGH accelerates tissue repair. It promotes collagen synthesis (making new collagen, the protein in skin and joints), speeds wound healing, and helps tendons and ligaments recover faster 1011. Athletes and fitness enthusiasts particularly value this benefit.
Many HGH users report significantly better sleep—falling asleep faster, sleeping deeper, and waking up feeling more refreshed. This makes sense because growth hormone is naturally released in pulses during deep sleep 9. Better sleep means better recovery, mood, and cognitive function.
Recombinant human growth hormone has been FDA-approved since 1985 and has extensive safety data from decades of clinical use 14. When used at appropriate replacement doses, it has a well-established safety profile 2. Most side effects are dose-dependent and reversible by reducing the dose 6. Long-term monitoring of blood sugar, IGF-1 (a growth signal your liver releases in response to growth hormone) levels, and overall health markers is recommended.
HGH has been studied extensively in thousands of patients for FDA-approved indications like growth hormone deficiency. The safety data for off-label anti-aging use is less robust, though generally shows a favorable profile at physiological doses 12. Regular monitoring and medical supervision are strongly recommended.
Keeping it good
Keep unopened HGH vials refrigerated at 36-46°F (2-8°C). Protect from light and keep in original packaging. Never freeze powder form. Most pharmaceutical HGH has an 18-24 month shelf life when properly stored. Check expiration dates.
Refrigerate immediately after mixing at 36-46°F (2-8°C). Never freeze reconstituted HGH—freezing denatures the protein and destroys the hormone. Avoid shaking—swirl gently if needed. Use within 28 days. Keep away from light.
Not our opinion — the published record
2025
This broad review found that growth hormone plays a key role in body composition, muscle mass, bone formation, and metabolism. It shows promising anti-aging effects, but it stresses that long-term safety and benefit for healthy aging still need more research.
Fernández-Garza LE, Guillen-Silva F, Sotelo-Ibarra MA, et al.
2025
This meta-analysis (a combined analysis of studies) of 10 randomized trials found that low-dose HGH therapy significantly reduces visceral (belly) fat and increases thigh muscle mass in obese individuals. No serious adverse events were reported, suggesting low-dose HGH may help with sarcopenic obesity (obesity with muscle loss).
Sun F, Yang A, Jin Y, et al.
2025
This study showed that continued HGH therapy significantly improved bone mineral density and grip strength in patients with GH deficiency. Patients who stopped treatment saw bone density fall and their blood fats (lipid profiles) get worse, showing why the right treatment length matters.
Xu Q, Yang Y, Ke J, et al.
2025
This real-world registry study (a record of everyday patients, not a trial) followed the first 100 patients on newer long-acting GH products. It gives insight into dosing patterns and how patients are chosen outside clinical trials, and shows how GH treatment approaches are changing.
Woelfle J, Kreitschmann-Andermahr I, Strasburger CJ, et al.
2025
This review looked at how differently people respond to GH therapy even when everyone follows the same standard plan. It stresses the need for personalized care. Treatment success depends on the diagnosis, patient factors, and getting the dose right.
Cianfarani S
2020
FDA-labeled dosing for adult growth hormone deficiency: a start not based on weight at ~0.2 mg/day (0.15-0.30 mg/day), raised every 1-2 months by 0.1-0.2 mg/day; or a weight-based start of not more than 0.04 mg/kg/week, up to 0.08 mg/kg/week, given as daily subcutaneous injections (injections under the skin).
Pfizer (FDA label)
1990
Six-month controlled trial in 21 healthy men aged 61-81 with low IGF-1 levels. Growth hormone treatment increased lean body mass by 8.8%, decreased fat tissue mass by 14.4%, and increased skin thickness by 7.1%. This suggests that falling GH levels contribute to the loss of lean mass and thinning skin seen in old age.
Rudman D, Feller AG, Nagraj HS, et al.
1991
24-hour blood sampling study in 21 healthy men aged 21-71. Each decade of added age reduced daily GH production by about 14%. Age and body mass index (BMI) together explained more than 60% of the differences in 24-hour GH production.
Iranmanesh A, Lizarralde G, Veldhuis JD
1996
Review of GH release during sleep. In adults, the most reliable GH pulse comes shortly after falling asleep, during the first phase of slow-wave (deep) sleep. In men, roughly 70% of sleep GH pulses happen during slow-wave sleep, and sleep-related release depends mainly on growth hormone-releasing hormone (GHRH, the brain's GH signal).
Van Cauter E, Plat L
If this isn't the right fit
Your questions
In most countries, HGH is a prescription-only medication that's legal to use with a valid prescription for approved medical conditions. Using it without a prescription or for non-approved purposes (like anti-aging or bodybuilding) may be illegal depending on your jurisdiction. In the US, it's specifically illegal to prescribe HGH for anti-aging purposes alone 12.
Yes, HGH is banned by virtually all sports organizations including WADA, NCAA, and professional leagues 15. While it was historically difficult to detect, modern blood tests can identify synthetic HGH 15. If you're a competitive athlete subject to drug testing, using HGH will likely result in a positive test and sanctions.
HGH is not a quick fix—it works gradually. Most people notice improved sleep within the first few weeks. Fat loss and body composition changes typically become visible around months 2-3. Full benefits including skin quality, muscle gains, and anti-aging effects develop over 4-6 months. HGH requires patience and consistent use 712.
This is a complex topic. HGH doesn't cause cancer, but it can potentially stimulate the growth of existing cancers because it promotes cell growth. That's why active cancer is an absolute contraindication. Studies on whether HGH increases cancer risk in healthy individuals are mixed, with most showing no significant increase at replacement doses 17. Regular health monitoring is essential.
HGH is the actual hormone itself—you're injecting synthetic growth hormone identical to what your body makes. HGH-releasing peptides (like CJC-1295, Ipamorelin, or GHRP-6) don't contain growth hormone; instead, they signal your pituitary (the master hormone gland at the base of the brain) to produce and release more of your own natural GH 16. Some people prefer peptides because they maintain your body's natural pulsatile release pattern.
Unlike some hormones, HGH doesn't require cycling to maintain effectiveness—your body doesn't develop significant tolerance to it 18. Many users take HGH continuously for years under medical supervision. However, some prefer cycling (like 5 days on, 2 days off) to reduce costs, minimize side effects, or for personal preference. Discuss your approach with your healthcare provider.
Pharmaceutical HGH requires complex recombinant DNA technology to produce, extensive quality control, and regulatory approval. The manufacturing process is expensive and time-consuming. This is also why counterfeits are common—the high price creates incentive for fake products. Always verify your source and look for testing certificates 14.
HGH can help with fat loss, particularly stubborn visceral (belly) fat, but it's not a weight loss drug per se 2. It works by shifting your body toward using fat for fuel while preserving and building muscle. The scale might not change much because muscle weighs more than fat, but your body composition improves. It works best combined with proper diet and exercise.
20 sources
Every numbered marker on this page points to one of these. Same sources, same numbering as the Human Growth Hormone (HGH) research profile on Peptide Initiative.
Want the deep science?
Every claim on this page traces back to the research database behind Peptide Initiative — studies, citations, clinical trial data, and the technical detail we deliberately left out here.
Open the research profileThis guide is education, not medical advice. Human Growth Hormone (HGH) is a research compound that is not FDA-approved for human use. Talk to a clinician before taking anything.
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