How is growth hormone deficiency diagnosed in adults?

Adult growth hormone deficiency (GHD) is diagnosed through stimulation testing — most commonly the insulin tolerance test (ITT) or glucagon stimulation test — which assesses whether the pituitary can produce adequate GH under physiological stress. Basal GH levels alone are unhelpful as GH is secreted in pulses. The test is performed by a specialist endocrinologist. Diagnosis is considered in adults with a history of pituitary disease, pituitary surgery, brain radiation, traumatic brain injury, or significant symptoms compatible with GHD alongside supporting biochemistry.

Is growth hormone therapy available for adults?

Yes — recombinant human growth hormone (somatropin) is licensed for adults with confirmed GHD. It is administered by daily subcutaneous injection and has evidence for improving body composition (reducing fat mass, increasing muscle mass), bone density, quality of life, and energy levels. It is available on the NHS for adults meeting specific criteria for confirmed GHD. Benefits must be balanced against side effects (fluid retention, joint pain) and costs, and treatment is supervised by an endocrinologist.

What natural factors support GH production?

Growth hormone is secreted in pulses — the largest occurring during deep (slow-wave) sleep. Prioritising sleep quality and duration is the most important natural support for GH production. High-intensity exercise (HIIT and resistance training) stimulates GH pulses. Fasting and protein-rich, lower-carbohydrate dietary patterns support GH sensitivity. Reducing body fat improves GH secretion — excess adipose tissue increases somatostatin, which suppresses GH. Amino acids including arginine and ornithine may modestly stimulate GH secretion. These strategies support GH axis function but cannot replace hormone therapy in true deficiency.

How does adult GHD affect quality of life?

Adult GHD has a significant impact on quality of life — consistently and measurably so in clinical studies. People with untreated GHD report reduced physical capacity, persistent fatigue, difficulty with concentration and memory, low mood, social isolation, and reduced overall vitality. These effects are often attributed to ageing or psychological causes before investigation. Effective treatment with GH therapy improves quality of life, body composition, bone density, and metabolic health, with benefits typically apparent within 6–12 months of starting therapy.

Hormonalelevated Risk

Growth hormone deficiency

Condition where the body doesn't produce enough growth hormone.

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Reviewed by Dr. Ian Henderson · Microbiobial Health & Medicine26 March 2026Research-supported

Quick answer

Growth hormone deficiency affects physical development, muscle mass, bone density, and metabolism. Holistic support focuses on sleep quality (when GH is predominantly secreted), exercise, and nutritional factors that support endocrine function alongside specialist endocrinological care.

Do any of these feel familiar?

Growth hormone deficiency in adults is experienced as a constellation of subtle but persistent symptoms — most commonly profound fatigue, reduced exercise capacity, and a loss of the physical vitality that previously felt normal
Many people describe changes in body composition: an increase in abdominal fat alongside a loss of lean muscle, despite unchanged diet and activity
Reduced bone density, lowered mood, difficulty concentrating, and a diminished sense of wellbeing are frequently reported
Many describe a feeling of premature ageing — a loss of resilience and recovery capacity
Because these symptoms are common to many conditions and develop gradually, growth hormone deficiency is often identified late and requires specific testing to confirm

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