Growth hormone infusions tested for immune boost in healthy men

NCT ID NCT00663611

Completed Knowledge-focused Sponsor: National Institute on Aging (NIA) Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Aug 07, 2026 · Updated 4 times

Summary

This completed Phase 1 study tested whether giving growth hormone (Norditropin) through a small pump under the skin could improve immune function in healthy men aged 25 to 50. Participants received either growth hormone or a placebo for up to 4 weeks, with frequent blood and urine tests to monitor effects. The goal was to see if growth hormone can reverse age-related immune decline, but results are not yet available.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Norditropin (somatropin, a synthetic growth hormone)
What this could lead to: If successful, this study could point toward ways to boost immune function in older adults or those with weakened immune systems.
What could go wrong: This is an early Phase 1 study in healthy men only, so results may not apply to women, older people, or those with illnesses. The study is completed, but no clear outcomes are reported yet.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

HEALTHY VOLUNTEERS

Contacts and locations

Locations

National Institute of Aging, Clinical Research Unit

Baltimore, Maryland, 21224, United States

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