HGH Benefits: Claims vs What Studies Show
Benefits people claim for HGH, set against what published studies measured, and where no study exists.
Medical review pendingRecombinant growth hormoneUpdated
- Strongest evidence
- Human RCT
- Human / animal studies
- 13 / 0
- in our evidence file (PubMed search, 2 Oct 2026)
- FDA status
- Approved (prescription only)
Claimed benefits and what studies show
Each row is an area where people claim a benefit, with the strongest study we summarise behind it. Animal and cell results are labelled and are not human results. User reports are not counted as evidence here.
| Claim | Best evidence | Studies (human / animal) | What was measured | Page |
|---|---|---|---|---|
| Muscle growth | Human RCT evidence, 4 of 4 | 6 / 0 | Muscle size during retraining; Lean mass and fat; Strength and quality of life | Evidence for muscle growth |
| Longevity | Human RCT evidence, 4 of 4 | 3 / 0 | Lean mass and fat; Strength and quality of life; Protein synthesis in older adults | Evidence for longevity |
| Healing | Human RCT evidence, 4 of 4 | 2 / 0 | Muscle size during retraining; Tendon structure; Tendon collagen synthesis | Evidence for healing |
| Men over 50 | Human RCT evidence, 4 of 4 | 3 / 0 | Lean mass and fat; Strength and quality of life; Protein synthesis in older adults | Evidence for men over 50 |
| Athletes | Human RCT evidence, 4 of 4 | 2 / 0 | Exercise capacity; Whole-body protein metabolism; Lean mass and leg strength | Evidence for athletes |
| Metabolism | Human RCT evidence, 4 of 4 | 2 / 0 | Insulin-stimulated glucose uptake; Body composition within 3 months; Attenuation at 24 months | Evidence for metabolism |
| Heart health | Human RCT evidence, 4 of 4 | 2 / 0 | Lipids; Blood pressure and heart rate; LDL cholesterol | Evidence for heart health |
| Sleep | Human RCT evidence, 4 of 4 | 3 / 0 | Sleep architecture; Night and daytime sleep; Sleep (well-being scale) | Evidence for sleep |
| Testosterone | Human RCT evidence, 4 of 4 | 2 / 0 | Lean mass and fat; Protein synthesis in older adults | Evidence for testosterone |
| Women | Human RCT evidence, 4 of 4 | 1 / 0 | Protein synthesis in older adults | Evidence for women |
| Diabetes | Human RCT evidence, 4 of 4 | 1 / 0 | Insulin-stimulated glucose uptake | Evidence for diabetes |
| Growth hormone | Human RCT evidence, 4 of 4 | 1 / 0 | Body composition within 3 months | Evidence for growth hormone |
| Bodybuilding | Review only | 0 / 0 | Lean mass, strength and exercise capacity; Conclusion on athletic performance | Evidence for bodybuilding |
| Hormone balance | Review only | 0 / 0 | Quality of life, well-being and health status | Evidence for hormone balance |
Strongest study per claim: Muscle growth, Journal of applied physiology 2014, PMID 24235105; Longevity, The Journal of clinical endocrinology and metabolism 2006, PMID 16332938; Healing, Journal of applied physiology 2014, PMID 24235105.
What the studies measured
| Outcome | Result | Study type | Source |
|---|---|---|---|
| Muscle size during retraining | Muscle cross-sectional area increased more with GH than placebo during retraining after immobilization. | Human RCTn = 12 | Journal of applied physiology 2014, PMID 24235105 |
| Tendon structure | GH appeared to stabilize musculotendinous matrix, increasing tendon cross-sectional area and stiffness during rehabilitation. | Human RCTn = 12 | Journal of applied physiology 2014, PMID 24235105 |
| Sleep architecture | Sleep period time and the intensity of slow-wave sleep were lower after rhGH than after placebo in GH-deficient adults (479 vs 431 min; 559 vs 794 uV2). | Human RCTn = 14 | European journal of endocrinology 2013, PMID 23447518 |
| Tendon collagen synthesis | Local rhGH injections increased tendon collagen synthesis in elderly men (an indirect marker of type I collagen synthesis; not a healing outcome). | Human RCTn = 12 | Journal of applied physiology 2012, PMID 22961272 |
| Lean mass and fat | Lean body mass increased with GH alone and with GH plus testosterone versus placebo; total body fat decreased only with the combination. | Human RCTn = 80 | The Journal of clinical endocrinology and metabolism 2006, PMID 16332938 |
| Strength and quality of life | Muscle strength changes were variable; one of six measures increased significantly with GH plus testosterone. | Human RCTn = 80 | The Journal of clinical endocrinology and metabolism 2006, PMID 16332938 |
| Exercise capacity | Four weeks of supraphysiological GH did not improve power output or oxygen uptake. | Human RCTn = 30 | The Journal of clinical endocrinology and metabolism 2005, PMID 15784718 |
| Protein synthesis in older adults | Low-dose GH increased protein synthesis in healthy aged women and men, and testosterone plus GH enhanced this in men (a whole-body protein-turnover measure). | Human RCT | Metabolism: clinical and experimental 2005, PMID 16125527 |
| Night and daytime sleep | GH replacement did not affect night sleep or daytime sleep propensity in GH-deficient adults. | Human RCT | Psychoneuroendocrinology 2005, PMID 15358440 |
| Whole-body protein metabolism | High-dose GH had a net anabolic effect on whole-body protein metabolism in endurance-trained athletes (a leucine-kinetics measure, not muscle size or performance). | Human RCTn = 11 | The Journal of clinical endocrinology and metabolism 2003, PMID 14602753 |
| Insulin-stimulated glucose uptake | Insulin-stimulated glucose uptake fell 52% at 1 week and 39% at 6 months. | Human RCTn = 19 | The Journal of clinical endocrinology and metabolism 2003, PMID 12679422 |
| Lipids | No significant difference in any lipid parameter between GH and placebo at 6 months; HDL-cholesterol fell from baseline. | Human RCTn = 32 | Clinical endocrinology 1998, PMID 10197085 |
| Body composition within 3 months | Within 3 months lean body mass rose 5.09% and body fat fell 10.89%; waist fell 1.42%. | Human RCTn = 148 | Clinical endocrinology 1997, PMID 9404448 |
| Attenuation at 24 months | At 24 months lean body mass was up 3.91% and body fat down 6.42%, smaller than the early effect. | Human RCTn = 148 | Clinical endocrinology 1997, PMID 9404448 |
| Sleep (well-being scale) | The Nottingham Health Profile improved (energy, emotions, sleep), but a similar change also occurred on placebo. | Human RCTn = 148 | Clinical endocrinology 1997, PMID 9404448 |
| Muscle strength | GH did not improve muscle strength over strength training alone in elderly men. | Human RCTn = 18 | The Journal of clinical endocrinology and metabolism 1994, PMID 7525633 |
| Body composition | Lean body mass increased and fat mass decreased in the GH group; body weight did not change. | Human RCTn = 18 | The Journal of clinical endocrinology and metabolism 1994, PMID 7525633 |
| Blood pressure and heart rate | No change in heart rate or blood pressure at rest or peak exercise. | Human RCTn = 36 | European journal of endocrinology 1994, PMID 8180671 |
| Lean mass and leg strength | Lean body mass rose 3.63% vs placebo (in 15 of 23 studies) and leg extension strength 3.17%. | Systematic reviewn = 1157 | JBJS reviews 2026, PMID 41557825 |
| Overall benefit and harm | Limited evidence suggests GH might offer diverse benefits with few adverse effects in older patients with comorbidities. | Systematic review | Growth hormone & IGF research 2024, PMID 38489867 |
Showing the first 20 of 30 rows, strongest sources first.
Not shown in any study we cite. Searches behind this page: PubMed search on 2 Oct 2026 for “(somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND adult*[tiab] AND (meta-analysis[pt] OR systematic review[pt])”: 68 results. PubMed search on 2 Oct 2026 for “(somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND ("growth hormone deficiency"[tiab]) AND adult*[tiab] AND randomized controlled trial[pt]”: 66 results. PubMed search on 2 Oct 2026 for “(somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (elderly[tiab] OR "older adults"[tiab] OR healthy[tiab]) AND (systematic review[pt] OR meta-analysis[pt])”: 8 results. PubMed search on 2 Oct 2026 for “(somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (athlet*[tiab] OR "physical performance"[tiab] OR "recreational"[tiab]) AND (randomized controlled trial[pt] OR systematic review[pt])”: 20 results.
Claimed: better athletic performance
A systematic review of growth hormone in healthy young people concluded that claims it enhances physical performance are not supported by the scientific literature.[16]
That review found lean body mass up by 2.1 kg in recipients, while strength and exercise capacity did not seem to improve.[16]
A 4-week randomized trial in healthy young men and women found supraphysiological recombinant GH did not improve power output or oxygen uptake.[5]
In endurance-trained male athletes, high-dose GH had a net anabolic effect on whole body protein metabolism; that is a metabolic measure, not a performance result.[8]
Claimed: anti-ageing and strength in older people
In healthy elderly men doing resistance training, GH did not add to the strength response.[12]
In a trial of older men, low-dose GH with testosterone produced beneficial changes more often than either alone.[4]
The same trial recorded more bodily pain with GH alone on a health survey.[4]
Where the evidence is stronger: diagnosed deficiency
A systematic review of replacement therapy in elderly patients with diagnosed GH deficiency found lower LDL cholesterol and better quality of life, with unequivocal effects on other measures absent.[28]
The Humatrope label's adult indication is replacement of endogenous GH in adults with GH deficiency.[29]
The same label states it is not indicated for non-GH-deficient adults.[29]
The label warns that inappropriate use of somatropin may result in significant negative health consequences.[29]
Claims with no study cited
The evidence file found no healthy-adult trial of GH for skin, hair growth, erectile dysfunction or sex drive; its searches returned only burn, paediatric, Prader-Willi or quality-of-life papers for these.
Calculated from evidence file web/src/data/evidence/hgh.json; claims with no study skin, hair growth, erectile dysfunction, sex drive; healthy adult trials 0. Formula: healthy-adult trials found for the four claims = 0
More on HGH
Common questions
Is HGH proven to work?
The strongest study we summarise for HGH is human rct evidence, among 20 studies. A trial result is not an approval; see the legal status.
What does HGH do?
Its labelled adult use is replacement in diagnosed GH deficiency; the label states somatropin binds GH receptors and stimulates IGF-1 and protein synthesis.[29]
More on HGH
DosageDoses used in published studies, with the source for each.CalculatorVial, water and dose to syringe units.Side effectsWhat labels and studies report, and what is unknown.ResultsStudy outcomes and when they were measured.PricePrice per mg and per week from dated listings. No vendor links.How it worksTarget, mechanism and how long it acts, from the label or studies.
Sources
- 1Effect of growth hormone on aging connective tissue in muscle and tendon: gene expression, morphology, and function following immobilization and rehabilitation.Journal of applied physiology (Bethesda, Md. : 1985) · 2014PMID 24235105Accessed 2 Oct 2026
- 2Impact of GH replacement therapy on sleep in adult patients with GH deficiency of pituitary origin.European journal of endocrinology · 2013PMID 23447518Accessed 2 Oct 2026
- 3Local administration of growth hormone stimulates tendon collagen synthesis in elderly men.Journal of applied physiology (Bethesda, Md. : 1985) · 2012PMID 22961272Accessed 2 Oct 2026
- 4The effects of growth hormone and/or testosterone in healthy elderly men: a randomized controlled trial.The Journal of clinical endocrinology and metabolism · 2006PMID 16332938Accessed 2 Oct 2026
- 5Short-term administration of supraphysiological recombinant human growth hormone (GH) does not increase maximum endurance exercise capacity in healthy, active young men and women with normal GH-insulin-like growth factor I axes.The Journal of clinical endocrinology and metabolism · 2005PMID 15784718Accessed 2 Oct 2026
- 6Effects of growth hormone and/or sex steroid administration on whole-body protein turnover in healthy aged women and men.Metabolism: clinical and experimental · 2005PMID 16125527Accessed 2 Oct 2026
- 7Night sleep EEG and daytime sleep propensity in adult hypopituitary patients with growth hormone deficiency before and after six months of growth hormone replacement.Psychoneuroendocrinology · 2005PMID 15358440Accessed 2 Oct 2026
- 8High dose growth hormone exerts an anabolic effect at rest and during exercise in endurance-trained athletes.The Journal of clinical endocrinology and metabolism · 2003PMID 14602753Accessed 2 Oct 2026
- 9Growth hormone replacement therapy induces insulin resistance by activating the glucose-fatty acid cycle.The Journal of clinical endocrinology and metabolism · 2003PMID 12679422Accessed 2 Oct 2026
- 10HDL-cholesterol reductions associated with adult growth hormone replacement.Clinical endocrinology · 1998PMID 10197085Accessed 2 Oct 2026
- 11Two years of replacement therapy in adults with growth hormone deficiency.Clinical endocrinology · 1997PMID 9404448Accessed 2 Oct 2026
- 12Effect of recombinant human growth hormone on the muscle strength response to resistance exercise in elderly men.The Journal of clinical endocrinology and metabolism · 1994PMID 7525633Accessed 2 Oct 2026
- 13Cardiovascular effects of growth hormone replacement therapy in hypopituitary adults.European journal of endocrinology · 1994PMID 8180671Accessed 2 Oct 2026
- 14Human Growth Hormone as a Therapeutic Treatment Option in Orthopaedics: A Systematic Review of Dosing, Side Effects, and Clinical Outcomes.JBJS reviews · 2026PMID 41557825Accessed 2 Oct 2026
- 15Growth hormone treatment in aged patients with comorbidities: A systematic review.Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society · 2024PMID 38489867Accessed 2 Oct 2026
- 16Systematic review: the effects of growth hormone on athletic performance.Annals of internal medicine · 2008PMID 18347346Accessed 2 Oct 2026
- 17Differential effect sizes of growth hormone replacement on Quality of Life, well-being and health status in growth hormone deficient patients: a meta-analysis.Health and quality of life outcomes · 2005PMID 16236167Accessed 2 Oct 2026
- 18PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND adult*[tiab] AND (meta-analysis[pt] OR systematic review[pt]) (68 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 19PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND ("growth hormone deficiency"[tiab]) AND adult*[tiab] AND randomized controlled trial[pt] (66 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 20PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (elderly[tiab] OR "older adults"[tiab] OR healthy[tiab]) AND (systematic review[pt] OR meta-analysis[pt]) (8 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 21PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (athlet*[tiab] OR "physical performance"[tiab] OR "recreational"[tiab]) AND (randomized controlled trial[pt] OR systematic review[pt]) (20 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 22PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND sleep[tiab] AND (randomized controlled trial[pt] OR clinical trial[pt]) (12 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 23PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (tendon[tiab] OR collagen[tiab] OR "wound healing"[tiab] OR fracture[tiab]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt]) (55 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 24PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (cardiovascular[tiab] OR cardiac[tiab] OR "blood pressure"[tiab] OR cholesterol[tiab] OR lipid*[tiab]) AND adult*[tiab] AND (meta-analysis[pt] OR systematic review[pt] OR randomized controlled trial[pt]) (77 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 25PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (diabetes[tiab] OR "insulin resistance"[tiab] OR glucose[tiab]) AND adult*[tiab] AND (meta-analysis[pt] OR systematic review[pt] OR randomized controlled trial[pt]) (52 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 26PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND (skin[tiab] OR hair[tiab] OR aging[tiab]) AND (randomized controlled trial[pt] OR clinical trial[pt]) (30 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 27PubMed search: (somatropin[tiab] OR "recombinant human growth hormone"[tiab] OR rhGH[tiab] OR "growth hormone replacement"[tiab] OR "growth hormone treatment"[tiab] OR "growth hormone therapy"[tiab]) AND ("sexual function"[tiab] OR libido[tiab] OR "erectile"[tiab] OR "quality of life"[tiab]) AND adult*[tiab] AND (randomized controlled trial[pt] OR meta-analysis[pt]) (29 results)PubMed · 2026pubmed.ncbi.nlm.nih.govAccessed 2 Oct 2026
- 28GH replacement therapy in elderly GH-deficient patients: a systematic review.European journal of endocrinology · 2011PMID 21339335Accessed 2 Oct 2026
- 29HUMATROPE prescribing information (FDA label)FDA label, DailyMed · current labeldailymed.nlm.nih.govAccessed 2 Oct 2026
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