HGH (Somatropin)
Recombinant human growth hormone, the protein itself, not a peptide that nudges your body to make more. Highest legal-risk compound in this catalog.
HGH (Somatropin): Recombinant human growth hormone, the protein itself, not a peptide that nudges your body to make more. Highest legal-risk compound in this catalog. HGH is the actual growth hormone protein your pituitary releases, not a peptide that nudges your body to release more.
HGH is the actual growth hormone protein your pituitary releases, not a peptide that nudges your body to release more. Prescription only in legitimate medicine. Carries the highest legal risk of anything in this space if used non-medically. Most users in this catalog run GH-axis *peptides* (Ipamorelin, CJC, Tesamorelin, Sermorelin) instead, which signal your own body to produce more GH naturally and carry far less regulatory exposure.
Approved under multiple brand names (Genotropin, Humatrope, Norditropin, Saizen, Omnitrope) for GH deficiency, AIDS wasting, Turner syndrome, short stature in children, idiopathic short stature, SHOX deficiency, and others.
FDA-approved drug products containing this substance are available. Compounded versions are not FDA-approved.
Yes, by endocrinologists for the approved indications. Performance use is illegal under the U.S. Anabolic Steroid Control Act.
Pepdex covers HGH for educational reference only. Recombinant HGH is regulated under the U.S. Anabolic Steroid Control Act for non-medical use. Most users in this space run the GH-axis peptides instead (Ipamorelin, CJC-1295, Tesamorelin, Sermorelin) which are well-documented in this catalog with cleaner regulatory status.
What people mean by “HGH peptides”
HGH is not one of them. Somatropin, the compound on this page, is a 191-amino-acid protein with the same sequence as the growth hormone a pituitary gland makes, so it supplies the hormone directly. The compounds people call HGH peptides work the other way round: they are shorter peptides that signal your own pituitary to release more of its own GH. Almost everything under the label acts through one of two receptor pathways, plus one oral compound that is not a peptide at all.
| Compound | Family | What it is | US status |
|---|---|---|---|
| Sermorelin | GHRH analog | Amidated GHRH(1-29), the biologically active fragment of natural GHRH. | Approval withdrawn |
| CJC-1295 (no DAC) | GHRH analog | Modified GRF(1-29), a short-acting GHRH analog. The long-acting DAC version is a different molecule with a different profile. | Not approved |
| Tesamorelin | GHRH analog | A stabilized GHRH analog, the only one here with a currently marketed FDA-approved product. | Approved, HIV lipodystrophy |
| Ipamorelin | GHRP | Selective ghrelin-receptor agonist. Preclinical work reported more GH selectivity and less cortisol and prolactin rise than older GHRPs. | Not approved |
| Hexarelin | GHRP | An earlier GHRP, investigated for GH release and for possible direct effects on heart tissue, mostly in small or preclinical studies. | Not approved |
| GHRP-2 / GHRP-6 | GHRP | The original two GHRPs. Increased appetite is a commonly reported effect, most associated with GHRP-6. | Not approved |
| MK-677 (Ibutamoren) | Not a peptide | A non-peptide small-molecule agonist of the same ghrelin receptor the GHRPs hit. Grouped with them because the endpoint matches, and orally active. | Not approved |
A GHRH analog and a GHRP are not interchangeable, and neither one delivers growth hormone. They raise what your own body releases, which only works where pituitary function is intact, and it is why the evidence base, the indications, and the regulatory picture all look nothing like somatropin’s. Full list with evidence grades on the growth hormone peptides category page.
Who it's for
- →People who already have a legitimate medical prescription (GH deficiency, AIDS wasting, short stature)
- →Educational reference, most users in this space run GH-axis peptides instead
What to expect
- Week 1
Water retention, mild joint stiffness, sleep changes.
- Week 4
IGF-1 climbs noticeably. Skin and recovery improvements appear.
- Week 8
Body comp shifts in users training with adequate protein.
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How it works (mechanism)
Recombinant human growth hormone (somatropin), the actual 191-amino-acid protein your pituitary makes. Binds GH receptors on the liver to trigger IGF-1 production, and directly on muscle, fat, and bone for tissue effects.
Dosing protocol
Stacks well with
Side effects
When NOT to use
- ⚠Active malignancy
- ⚠Active diabetic retinopathy
- ⚠Acute critical illness (post open-heart or abdominal surgery, multiple trauma, or acute respiratory failure, raised mortality in ICU trials)
- ⚠Pregnancy / nursing
- ⚠No legitimate medical indication
Bloodwork to monitor
- • IGF-1
- • Fasting glucose / A1C
- • TSH / fT4
- • ALT/AST
Common mistakes
- • Treating it like a peptide with low oversight, it isn't
- • Underestimating the legal/regulatory risk
- • Stacking with other things that raise insulin resistance
What it actually is
HGH, or somatropin, is recombinant human growth hormone — the actual 191-amino-acid protein your pituitary makes, manufactured in a lab. It is not a peptide that nudges your body to produce more of its own; it is the hormone itself, given directly. It is an approved prescription medicine for specific deficiencies. The US legal position is narrower than it is usually stated: 21 U.S.C. 333(e) criminalises knowingly DISTRIBUTING growth hormone, or possessing it WITH INTENT to distribute, for uses other than those authorised and outside a physician's order. Simple possession is not itself a federal crime under that provision, and growth hormone is not federally scheduled as an anabolic steroid. Importation, misbranding and state-law offences may still apply. The distinction matters because the usual shorthand is wrong.
HGH acts partly on its own and largely through IGF-1, which the liver produces in response to it. IGF-1 drives tissue growth and repair, and growth hormone itself promotes release of fat from fat cells while pushing tissues toward using fat rather than glucose for fuel. That last effect is also why it raises blood sugar and reduces insulin sensitivity: the same mechanism that mobilises fat makes your cells less responsive to insulin.
Forms, and which is which
Manufacturer product with assured identity, potency and sterility. Indications are PRODUCT-specific rather than shared across the class: Serostim is approved for HIV-associated wasting, Zorbtive for short bowel syndrome, and other brands carry particular adult growth hormone deficiency and paediatric growth indications. They are not interchangeable across labels.
Verdict: The only form with known contents, and the label depends on the brand.
Weekly rather than daily, with non-inferiority trials behind them in growth hormone deficiency.
Verdict: Legitimate pharmacy alternatives where prescribed.
The counterfeit rate in this market is notoriously high; underfilled and substituted product is common, and a protein this size is not something a buyer can verify.
Verdict: High legal risk and high odds of not getting what you paid for.
A 191-amino-acid protein is destroyed by digestion and cannot be absorbed intact from the gut or the mouth lining.
Verdict: These cannot work by the route claimed.
What it is claimed to do, graded
The approved indication, with phase 3 trials including modern head-to-head comparisons of weekly versus daily preparations.
Both are approved indications supported by randomised data, each under a specific product — Serostim and Zorbtive respectively — rather than somatropin generally.
Meta-analysed across randomised trials in healthy older adults: fat mass falls and measured lean mass rises. Read the claim narrowly — it is about body composition on a scan, and the same reviews find no matching gain in strength or function.
A blinded randomised trial in 96 recreational athletes found a statistically significant 3.9% increase in sprint capacity with growth hormone, and no significant improvement in strength, power or aerobic endurance. So: one narrow, short-lived finding of uncertain athletic significance, and nothing supporting the broad claim this is usually taken for.
The famous 1990 study behind this claim was small, uncontrolled for exercise, and its author later publicly objected to how it was used to sell the idea.
Grades describe how much human evidence exists for that specific claim, not whether it will work for you or whether it is safe.
Pros and cons
- • For genuine deficiency it is effective, well characterised and life-changing
- • Decades of clinical use means the risks are actually known rather than guessed at
- • Pharmacy product has assured potency, unlike anything in the research-chemical market
- • Federal criminal exposure in the US for non-medical distribution or possession
- • Raises blood glucose and reduces insulin sensitivity, and that worsens with dose and duration
- • Carpal tunnel symptoms, joint stiffness and fluid retention are common
- • Chronic excess can produce acromegaly-like changes; soft-tissue swelling, glucose intolerance and carpal tunnel symptoms often improve after stopping, while established bony and degenerative joint changes may not
- • The grey market is heavily counterfeited
- • Increased mortality was seen in ICU patients given high-dose GH, which is why acute critical illness is a contraindication
When to stop
- • Any serious allergic reaction — hypersensitivity to somatropin or an excipient is a labelled contraindication
- • Persistent severe abdominal pain — labelling asks that pancreatitis be considered
- • Fasting glucose or A1C rising out of range. This needs prompt clinician review rather than automatic discontinuation: growth hormone can unmask glucose intolerance, and either the diabetes treatment or the growth hormone regimen may need adjusting
- • Persistent numbness, tingling or weakness in the hands
- • New or worsening vision changes, or severe recurrent headaches
- • Hands, feet or facial features visibly changing
- • Any new cancer diagnosis
- • Acute critical illness following open-heart or abdominal surgery, multiple trauma or acute respiratory failure
Interactions
Growth hormone opposes insulin. Diabetic patients commonly need their doses revisited, which is a prescriber's job.
The safety-critical one. Growth hormone inhibits 11-beta-HSD1 and can lower serum cortisol, so someone on replacement steroid may need a higher maintenance or stress dose. Separately, pharmacologic steroid doses blunt the growth response.
Somatropin labelling notes it can alter clearance of drugs metabolised by CYP450, including some anticonvulsants, ciclosporin and sex steroids.
Starting growth hormone can unmask hypothyroidism. Thyroid function is worth checking on it.
Reduces the IGF-1 response, so the same dose does less.
Stacking direct growth hormone with something that raises your own adds the insulin-resistance risk of both for no established gain.
Is this for you?
- • People with a diagnosed growth hormone deficiency and a prescription
- • Anyone reading this to understand why the GH-axis peptides exist at all
- • You have active cancer
- • You have active proliferative or severe non-proliferative diabetic retinopathy — that is the specific labelled contraindication, not retinopathy generally
- • You have had a serious hypersensitivity reaction to somatropin or any excipient
- • You are acutely critically ill following open-heart or abdominal surgery, multiple trauma or acute respiratory failure. Ordinary recovery from surgery is not the labelled contraindication
- • You are pregnant or nursing — data are limited and this is a product-specific risk-benefit decision rather than an absolute bar
The one number
Sources for the claims above
- Weekly somatrogon versus daily somatropin in growth hormone deficiency
- Approved use in short bowel syndrome
- Effects on body composition and physical performance in recreational athletes
- Systematic review of safety and efficacy in the healthy elderly
Drug & supplement interactions
- ⚠Glucocorticoids reduce HGH efficacy
- ⚠Insulin requirements may shift, closer monitoring needed in diabetics
- ⚠Estrogen (oral) reduces HGH effect on IGF-1
- ⚠Thyroid hormone requirements may increase
Community patterns
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Common questions about HGH (Somatropin)
Head-to-head with HGH (Somatropin)
Tracked alongside HGH (Somatropin)
Same goal, different aisle — each graded on its own evidence in the Pepdex catalog.
More in GH-axis
Oral ghrelin mimetic. Bumps GH and IGF-1 without injections. Strong appetite stimulation is the trade-off.
Bumps your natural growth-hormone pulses without hitting cortisol or prolactin. A selective GH secretagogue.
Pairs with Ipamorelin to amplify your natural growth-hormone pulses. A GHRH analog whose 'no-DAC' version stays short-acting on purpose.
Used to drive muscle growth. A long-acting form of insulin-like growth factor 1, with limited human safety data and a real side effect profile, handle with discipline.