What is sermorelin and how is it dosed?

Sermorelin is a synthetic analog of growth hormone releasing hormone (GHRH), consisting of the first 29 amino acids of endogenous GHRH. It stimulates the pituitary gland to produce and release growth hormone in a pulsatile, physiological manner. Research and clinical protocols typically use 200–500 mcg subcutaneously, most often injected before sleep to amplify the natural nocturnal GH pulse. Some protocols use 100–200 mcg doses twice daily.

How do I calculate sermorelin syringe units from a mcg dose?

First, calculate vial concentration: concentration (mcg/mL) = vial mg × 1,000 ÷ BAC water mL. Then: units to draw = (dose in mcg ÷ concentration) × 100 for a U-100 syringe. Example: 5 mg vial + 2 mL BAC water = 2,500 mcg/mL. A 500 mcg bedtime dose = 500 ÷ 2,500 × 100 = 20 units on U-100 (0.20 mL). At 5 mL BAC water (1,000 mcg/mL), 500 mcg = 50 units.

How does sermorelin compare to CJC-1295 (no DAC)?

Both sermorelin and CJC-1295 (no DAC) are GHRH analogs that work by the same mechanism. Sermorelin is the original 29-amino-acid GHRH fragment with a half-life of approximately 7–10 minutes; CJC-1295 (no DAC) is a modified version with four amino acid substitutions that extends half-life to approximately 30 minutes. The longer half-life of CJC-1295 is generally considered advantageous, but sermorelin has the most established human safety record from decades of clinical use and is still widely prescribed.

Should I stack sermorelin with ipamorelin?

Yes — stacking sermorelin (a GHRH analog) with ipamorelin (a GHRP) produces a synergistic GH pulse larger than either peptide alone. Sermorelin increases the pituitary pool of GH-ready somatotrophs; ipamorelin triggers the release. A typical combined dose is 200–500 mcg of sermorelin + 200–300 mcg of ipamorelin, drawn into the same syringe and injected together before sleep.

How much BAC water should I add to a sermorelin vial?

For a 5 mg vial, adding 2 mL BAC water gives 2,500 mcg/mL — a 500 mcg dose = 20 units on U-100. Adding 5 mL gives 1,000 mcg/mL — 500 mcg = 50 units. The 2 mL configuration works well for sermorelin's typical 200–500 mcg doses, keeping draws in the 8–20 unit range. If you need to measure doses below 200 mcg precisely, use 5 mL for better resolution.

How should reconstituted sermorelin be stored?

Reconstituted sermorelin in BAC water should be refrigerated at 2–8°C and used within 28 days. Avoid freeze-thaw cycles. Lyophilized sermorelin powder should be stored frozen at −20°C and is stable for 1–2 years. Protect from light. Always use aseptic technique: wipe the vial stopper with an alcohol swab before each draw and use a fresh needle per injection.

What are the benefits of sermorelin?

Sermorelin stimulates natural pulsatile GH release from the pituitary, which elevates IGF-1 over time. Clinical and research use reports improved slow-wave sleep quality (the phase most associated with GH secretion and tissue repair), increased lean body mass, reduced body fat, improved energy levels, and better skin quality. Because sermorelin works within normal pituitary feedback — unlike exogenous GH — IGF-1 cannot exceed physiologically normal ranges, which is a meaningful safety advantage and one reason sermorelin has the most established human clinical record of any GHRH analog.

What are the side effects of sermorelin?

The most common side effect is injection site reactions (redness, swelling, or pain), which occur in a significant portion of users. Systemic effects include flushing, headache, dizziness, and mild nausea — typically transient and most pronounced in the first 1–2 weeks. Water retention from IGF-1 elevation can cause mild peripheral edema. Difficulty swallowing and pallor have been reported rarely. The overall side effect profile is considered very mild; decades of clinical pediatric use support its tolerability.

Sermorelin Dosage Calculator

Calculates syringe units and injection volume for sermorelin doses in mcg from vial size and BAC water volume.

How Sermorelin Dosage Calculation Works

This sermorelin dosage calculator converts your dose in mcg into the exact insulin syringe units to draw. Sermorelin is dosed in micrograms and injected subcutaneously using an insulin syringe. The number of syringe units to draw depends on your vial concentration, which is set by the amount of BAC water you add during reconstitution.

Concentration (mcg/mL) = Vial size (mg) × 1,000 ÷ BAC water added (mL)
Units to draw = (Target dose in mcg ÷ Concentration) × 100 for U-100 syringe

Example: 5 mg vial + 2 mL BAC water = 2,500 mcg/mL. A 500 mcg bedtime dose = 500 ÷ 2,500 × 100 = 20 units on U-100 (0.20 mL). Enter your values above and the calculator handles the conversion.

Sermorelin Dosing Reference — U-100 Syringe Units

Common sermorelin doses and syringe units at 2,500 mcg/mL (5 mg vial + 2 mL BAC water):

200 mcg: 8 units on U-100 — 0.08 mL
300 mcg: 12 units on U-100 — 0.12 mL
500 mcg: 20 units on U-100 — 0.20 mL (most common bedtime dose)
1,000 mcg: 40 units on U-100 — 0.40 mL

Use the peptide reconstitution calculator to model different BAC water volumes and see how they change the units per dose.

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Stacking Sermorelin with Ipamorelin

Sermorelin (GHRH) and ipamorelin (GHRP) are a classic stack combination. Sermorelin increases the pituitary pool of GH-ready cells; ipamorelin fires the actual pulse. Together, the GH response is substantially larger than either peptide produces alone.

Typical combined protocol: 300–500 mcg sermorelin + 200–300 mcg ipamorelin, drawn into the same syringe and injected subcutaneously 30–60 minutes before sleep on an empty stomach. See the ipamorelin dosage calculator for ipamorelin unit math. The CJC-1295 calculator covers a more potent GHRH alternative to sermorelin.

Injection Timing for Maximum GH Output

Sermorelin is most effective injected before sleep because it amplifies the body's largest natural GH pulse, which occurs during slow-wave sleep. Key timing rules: fast for at least 2 hours before injection (elevated insulin significantly blunts pituitary GH response), inject 30–60 minutes before sleep, and avoid eating or high-glycemic foods after injection until morning.

Sermorelin vs. CJC-1295 and Tesamorelin

All three are GHRH analogs. Sermorelin has the shortest half-life (~7–10 minutes) and the longest clinical safety record — it was FDA-approved for pediatric GH deficiency. CJC-1295 (no DAC) has a ~30-minute half-life, making it a more potent per-injection option. Tesamorelin is an FDA-approved GHRH analog for visceral fat in HIV lipodystrophy and is widely used in longevity medicine at 1–2 mg/day. See the tesamorelin dosage calculator for tesamorelin-specific defaults.

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Sermorelin Benefits and Research

Sermorelin (GHRH 1-29) is the oldest and most clinically studied GHRH analog in human use. It was FDA-approved for pediatric growth hormone deficiency under the brand name Geref, giving it decades of human safety and efficacy data that newer GHRH analogs like CJC-1295 and tesamorelin do not yet match. The clinical record in children with GH deficiency demonstrated consistent GH and IGF-1 elevation with excellent tolerability, forming the basis for its widespread off-label use in adult longevity and anti-aging medicine.

Sermorelin works by binding pituitary GHRH receptors, stimulating GH secretion in pulses that mirror the body's natural rhythm. Because it operates within the pituitary's normal feedback loop, IGF-1 rises but is self-limited by somatostatin — the body's own GH brake. This contrasts with exogenous GH, which bypasses feedback and can suppress the pituitary's own secretion over time. Key reported benefits in adult research contexts include improved slow-wave sleep architecture, increased lean body mass over 3–6 month protocols, reduced visceral adiposity, and improved energy and sense of well-being.

Clinical safety record: FDA-approved for pediatric GH deficiency; most established human safety data of any GHRH analog
Sleep quality: improved slow-wave sleep — the phase where GH secretion and tissue repair are most active
Body composition: increased lean body mass and reduced fat reported in clinical and research protocols lasting 3–6 months
Pituitary preservation: works within feedback control; does not suppress the pituitary like exogenous GH
Skin and hair: secondary effects of elevated IGF-1 over sustained protocols

Sermorelin Side Effects and Safety

Sermorelin has one of the most favorable side effect profiles in the GHRH class, supported by decades of pediatric and adult clinical data. Most adverse effects are mild, transient, and relate to either the injection itself or the downstream GH response.

Injection site reactions — redness, swelling, or pain; the most common side effect, reported in a meaningful proportion of clinical trial patients; rotate injection sites
Flushing — transient warmth or redness; typically lasts minutes and diminishes with continued use
Headache — mild; most common in the first few weeks
Dizziness — occasional; generally not clinically significant
Nausea — rare; mild and self-limiting
Water retention — mild peripheral edema from IGF-1 elevation; resolves with dose adjustment
Dysphagia (swallowing difficulty) — rare; reported in clinical literature but uncommon at standard doses
Allergic reactions — rare but possible; seek medical attention for urticaria, swelling, or difficulty breathing

Sermorelin should not be used in individuals with active pituitary tumors, untreated hypothyroidism, or active malignancy. GH stimulation in these contexts carries additional risks. The pituitary-feedback mechanism provides an intrinsic safety ceiling on IGF-1 elevation that exogenous GH does not. Always consult a licensed healthcare provider before beginning any GHRH protocol.

Storage and Safe Handling

Refrigerate reconstituted sermorelin at 2–8°C and use within 28 days. Do not freeze reconstituted peptide. Lyophilized powder should be stored frozen at −20°C for long-term preservation. Always use aseptic technique: wipe the stopper with an alcohol swab before each draw and use a fresh needle per injection. Dispose of sharps in a puncture-resistant container.

Sources & References

Bacteriostatic Water for Injection — FDA Information — U.S. Food and Drug Administration
Insulin Syringe and Injection Guidance — American Diabetes Association
Safe Medication Practices — Institute for Safe Medication Practices