The Core Difference: Stimulate vs. Replace
- Human Growth Hormone (HGH): A synthetic version of the growth hormone your pituitary already makes. Injecting it bypasses your body's own production. FDA-approved only for documented growth hormone deficiency, short stature in children, and a handful of other specific conditions. Prescribing HGH for anti-aging or general wellness is off-label and legally prohibited without a qualifying diagnosis — HGH is a controlled substance under the Anabolic Steroid Control Act for non-qualifying uses.
- Sermorelin (GHRH 1-29): A synthetic analog of growth hormone-releasing hormone (GHRH) — the signal your hypothalamus naturally sends to tell your pituitary to produce growth hormone. Sermorelin does not replace growth hormone. It stimulates your own pituitary to secrete it in a pulsatile, physiologically regulated pattern.
HGH replacement suppresses your pituitary's own GH production over time. Sermorelin works with your pituitary rather than around it, preserving the feedback architecture that keeps hormone levels in the appropriate physiological range.
YourMD’s Position: No HGH, and Sermorelin Is On Hold
YourMD does not prescribe HGH, testosterone, or any controlled substance under any circumstances. Sermorelin is on hold and not currently prescribed while we confirm pharmacy eligibility. We are awaiting written confirmation of its compounding eligibility from the compounding pharmacy; until then, YourMD does not offer it.
Theoretical (physiological) differences between sermorelin and exogenous HGH, as described in the literature:
- Preserved negative feedback: Somatostatin (the inhibitory signal) is still released if GH rises too high — this doesn't happen with exogenous HGH.
- Pulsatile GH pattern maintained: Normal GH secretion is pulsatile. Sermorelin preserves this rhythm. Exogenous HGH creates a flat non-pulsatile elevation.
- Pituitary preserved: Long-term exogenous HGH can downregulate the pituitary's own somatotroph cells. Sermorelin maintains and in some studies appears to restore pituitary reserve.
- Significantly lower side effect burden: Acromegaly features, carpal tunnel, fluid retention, insulin resistance, and potential increased cancer risk associated with supraphysiologic HGH are far less likely with sermorelin because levels are physiologically limited.
What Sermorelin Does — The Evidence
GH naturally declines with age — secretion at age 60 is approximately 50% of what it was at age 25. This contributes to body composition changes of aging: reduced lean muscle mass, increased visceral fat, decreased bone density, reduced energy, impaired sleep quality.
- Body composition: Studies in older adults show GHRH stimulation reduces visceral fat and increases lean body mass over 6–12 months. Effect sizes are modest but consistent with physiological restoration.
- Sleep quality: GHRH peptide administration has been shown in small RCTs to increase slow-wave sleep duration and improve subjective sleep quality.
- IGF-1 levels: The most reliable biomarker of GH axis activity reliably increases with sermorelin and can be monitored to avoid supraphysiologic levels.
- Important limitation: Most sermorelin studies are small, short duration, and funded by compounding industry sources. No large independent RCT has established long-term efficacy for off-label wellness use. The physiological rationale is sound; the clinical evidence base is early.
Safety Considerations (Educational)
In the published literature, GH-axis therapies are generally avoided in people with active malignancy or a recent cancer history, active proliferative diabetic retinopathy, untreated hypothyroidism, or pregnancy, and IGF-1 is used to monitor response.
Availability at YourMD
Sermorelin is on hold and not currently prescribed while we confirm pharmacy eligibility. We do not list a price or accept sermorelin requests at this time. If you are interested in age-related changes in energy, sleep, or body composition, a YourMD physician can evaluate your symptoms, order appropriate labs, and discuss evidence-based options that are currently available.