At a Glance
Quickcomparison
Dose Range
Tesamorelin
1–2 mg
Sermorelin
100–300 mcg
Frequency
Once daily
Administration
Subcutaneous injection
Cycle Length
12+ weeks
Onset Speed
Moderate (1-2 weeks)
Evidence Level
Strong human trials (Phase 3 or FDA approved)
Moderate human trials (Phase 1-2)
Efficacy
Benefitratings
Visceral Fat Reduction
Metabolic Health
Natural GH Boost
GH Optimization
Sleep Quality
Body Composition
Technical Data
Compoundspecifications
Molecular Formula
C221H366N72O67S
Molecular Weight
5135.86 g/mol
Half-Life
26-38 minutes
Bioavailability
~100% (subcutaneous injection)
CAS Number
218949-48-5
C149H246N44O42S
3357.9 g/mol
10-20 minutes
High when injected subcutaneously; degraded orally
86168-78-7
Protocols
Dosingtiers
standard
2 mg (1.4 mg with Egrifta SV/WR F8 formulation)
26 weeks, continued long-term for sustained effect
FDA-approved dose for HIV-associated lipodystrophy; full dose from day one with no titration [6]. Pivotal phase 3 trials used 2 mg daily [1].
starting
100-200 mcg
Once daily at bedtime
4-6 weeks
Lower nightly dose used in practice; GHRH(1-29) nightly injections raised GH/IGF-1 in older adults [2][3].
200-300 mcg
3-6 months
Common adult maintenance dose; twice-daily GHRH(1-29) reversed age-related GH/IGF-1 decline in men [1][2].
Applications
Bestsuited for
People with Stubborn Visceral Fat
If you carry your weight around your midsection—the deep belly fat that wraps around your organs—tesamorelin is specifically designed for you. Unlike weight loss drugs, it targets visceral fat while preserving the normal subcutaneous fat that's healthy to have.
HIV Patients with Lipodystrophy
Tesamorelin is FDA-approved specifically for HIV-associated lipodystrophy—the abnormal fat accumulation in the belly that antiretroviral medications can cause. It's the only treatment proven to help this condition, reducing both the physical and psychological burden.
Those Concerned About Metabolic Health
Visceral fat isn't just cosmetic—it's metabolically dangerous, linked to heart disease, diabetes, and inflammation. By reducing visceral fat, tesamorelin also improves triglycerides, cholesterol ratios, and may help protect your liver from fatty liver disease.
Adults Wanting Natural GH Stimulation
Unlike synthetic growth hormone injections, tesamorelin works WITH your body's natural systems. It tells your pituitary to release more of YOUR OWN growth hormone, maintaining normal feedback loops and reducing the risks associated with supraphysiological GH levels.
Adults Experiencing Age-Related GH Decline
After age 30, your growth hormone production naturally declines about 14% per decade. Sermorelin helps restore more youthful GH levels by stimulating your own pituitary rather than shutting it down with external hormones. It's like giving your hormone system a gentle nudge back to where it used to be.
Body Composition Optimizers
If you're struggling to lose stubborn belly fat or build lean muscle despite diet and exercise, sermorelin can help shift your body composition over time. Studies show it increases lean mass and reduces fat, especially in older adults whose natural GH has declined.
Sleep Quality Seekers
Growth hormone is intimately tied to deep, restorative sleep. By enhancing your natural nighttime GH pulses, sermorelin often improves sleep quality as a welcome side effect. Many users report falling asleep faster and waking more refreshed.
Those Wanting a Safer Alternative to HGH
Direct HGH injections bypass your body's feedback system and can suppress your own production. Sermorelin works differently—it asks your pituitary to make more GH naturally. This preserves your body's regulatory mechanisms and carries a lower risk of side effects.
Safety Profile
Sideeffects
Common
Injection site reactions
Joint pain (arthralgia)
Muscle pain (myalgia)
Peripheral edema
Uncommon
Carpal tunnel symptoms
Elevated blood glucose
Serious
Severe allergic reaction
Worsening diabetes
Facial flushing
Headache
Sleepiness or drowsiness
Nausea
Hyperactivity or difficulty sleeping
Research Status
Safety& evidence
FDA Status
FDA approved for other use
Safety Overview
Tesamorelin has a strong safety profile backed by FDA approval and multiple large Phase 3 clinical trials involving over 800 patients. The most common issues are injection site reactions and the typical side effects of elevated growth hormone (joint pain, fluid retention). Glucose metabolism should be monitored as some patients experience increased blood sugar. Long-term cardiovascular safety data is still being collected, which is why the FDA recommends reassessing treatment if visceral fat doesn't reduce.
Contraindications
xActive malignancy or history of cancer (pituitary tumors especially)
xKnown hypersensitivity to tesamorelin or mannitol
xPregnancy
xDisruption of the hypothalamic-pituitary axis from conditions like hypophysectomy or pituitary tumor surgery
Sermorelin has an excellent safety profile backed by FDA approval history and decades of clinical use. Unlike direct HGH, it works through your body's natural feedback mechanisms, which inherently limits excessive hormone levels. Side effects are generally mild and transient—mostly injection site reactions and occasional flushing. The peptide was FDA-approved in 1997 for pediatric use and is one of the most well-studied growth hormone secretagogues available.
xActive cancer or history of cancer
xPregnancy or breastfeeding
xKnown allergy to sermorelin or any peptide components
xPituitary tumors or other pituitary disorders
xDiabetic retinopathy
Decision Guide
Which isright for you?
Choose Tesamorelin if...
Reducing visceral abdominal fat
Improving metabolic health markers
Supporting natural growth hormone production
Addressing HIV-associated lipodystrophy
Choose Sermorelin if...
Anti-aging and vitality
Body composition improvement
Sleep quality enhancement
Exercise recovery