Last November, a 52-year-old general contractor named Ray from Fort Worth called his prescribing clinic three days into his sermorelin protocol. "I drew up 20 units thinking that was 200 micrograms," he told the nurse on the phone, "but my vial was reconstituted with 1 mL, not 2. So I've been injecting double my dose for three nights." Ray was fine, no adverse events beyond some facial flushing and vivid dreams, but the call is a perfect snapshot of why reconstitution math and dosing clarity actually matter with compounded peptides. Small numbers, big consequences if you misread the label.
The short answer on sermorelin dosing: most adult protocols land between 200 and 500 mcg injected subcutaneously once daily at bedtime. The exact number comes from your prescriber, who will factor in your age, body weight, baseline IGF-1, and what you're trying to accomplish. Sermorelin is a growth hormone releasing hormone (GHRH) analog, compounded off-label by licensed pharmacies for adults under physician supervision.
Below is everything the clinical literature and real-world compounding protocols tell us about how doses are chosen, why the clock matters, and how to not pull a Ray with your reconstitution math.
The Dose Range and What Drives It
Sermorelin doesn't inject growth hormone into your bloodstream. It nudges the pituitary to release the GH it already makes. How big that nudge turns out to be depends on factors you can't control from a syringe: how much native GHRH receptor activity you still have, how responsive your pituitary is, your age. A 35-year-old with midrange IGF-1 and a 62-year-old in the bottom quartile are not the same patient.
That variability is why compounded sermorelin protocols work in ranges rather than a single number.
- 100 to 200 mcg nightly: conservative starting territory. Common for older adults, smaller-framed patients, or anyone brand new to peptide therapy.
- 200 to 300 mcg nightly: the workhorse maintenance dose for most healthy adults.
- 300 to 500 mcg nightly: reserved for larger patients or those with documented age-related GH decline who tolerated lower doses without problems.
Walker's published research on sermorelin, dating back to the molecule's development, used dosing in this general range and demonstrated pulsatile GH release without the supraphysiologic spikes you get from recombinant growth hormone. That pulsatile pattern is the whole point: you want the pituitary doing the work, not a synthetic hormone steamrolling your feedback loops.
For the individual dose your prescriber selects, expect them to weigh baseline IGF-1, age, body weight, any comorbidities (diabetes, sleep apnea, cancer history all shift the calculus), treatment goals, and how you tolerate the starting dose. Adjustments typically happen at the three-month mark, once IGF-1 has reached a new steady state.
Bedtime Injection: Not Arbitrary
Your body dumps its largest natural growth hormone pulse during the first couple hours of slow-wave sleep. Sermorelin is designed to ride that wave, amplifying what the pituitary already does at night rather than overriding it.
Injecting roughly 30 minutes before you plan to fall asleep puts the peptide's activity right on top of that endogenous pulse. Daytime injection is possible (some split-dose protocols call for it), but the once-daily bedtime shot is the default for a reason.
Here's the thing about food timing: a high-carb or high-fat meal close to injection can blunt the GH response. The practical recommendation is a two-hour empty-stomach window before injecting and about 30 minutes after. You don't need to obsess over this, but polishing off a plate of pasta at 10:15 and injecting at 10:30 is working against yourself.
Reconstitution Math (the Part People Get Wrong)
Sermorelin arrives as a freeze-dried powder. You add bacteriostatic water, and the resulting concentration determines how many units on the syringe equal your prescribed dose. Mess up the concentration and you're in Ray's situation.
Check your GLP-1 eligibility
Use our free BMI Calculator to see if you may qualify for provider-reviewed GLP-1 therapy.
Try the BMI Calculator →A common compounded vial contains 5 mg (5,000 mcg) of sermorelin powder.
If you reconstitute with 2 mL of bacteriostatic water: Concentration = 2,500 mcg per mL, or 250 mcg per 0.1 mL.
On a standard U-100 insulin syringe (100 unit markings per mL):
- 10 units (0.1 mL) = 250 mcg
- 12 units (0.12 mL) = 300 mcg
- 20 units (0.2 mL) = 500 mcg
If you reconstitute the same 5 mg vial with 1 mL: Concentration doubles to 5,000 mcg per mL. Every tick on that syringe is now worth twice as much.
Both approaches work. Use whichever reconstitution volume appears on your pharmacy's label. If the label says 2 mL and you add 1 mL, you've just doubled every dose you draw.
For syringes, a U-100 insulin syringe with a 29 to 31 gauge, 5/16-inch or 1/2-inch needle is standard. Stick with a 0.3 mL (30 unit) or 0.5 mL (50 unit) barrel. The 1 mL syringe is overkill for sermorelin volumes and makes small-dose precision harder.
Where and How to Inject
Subcutaneous means the peptide goes into the fat layer just under the skin, not into muscle. Three reliable sites:
- Lower abdomen, roughly two inches from the navel in any direction
- Outer thigh, the fleshy area between hip and knee
- Back of the upper arm, the triceps fat pad
Rotate sites nightly. Left abdomen, right abdomen, left thigh, right thigh, repeat. This isn't fussiness; it prevents lipohypertrophy, the lumpy tissue changes that develop when you hammer the same spot over and over. Think of it like not parking on the same patch of grass every day.
Flat Dose vs. Weight-Based Dose
Most compounded adult protocols use flat dosing. Your prescriber says 300 mcg nightly and that's the number whether you weigh 150 pounds or 220. This works because the dose-response curve for GHRH analogs flattens at relatively low absolute amounts. Doubling the dose doesn't double the GH pulse.
Some clinicians prefer weight-based math, typically 1 to 5 mcg per kg per day. For a 70 kg adult, that yields 70 to 350 mcg. In practice, the two approaches converge for most adult body weights, which is why the debate is more academic than clinical.
(Pediatric sermorelin protocols historically used weight-based dosing with weekly totals. That's a different universe from compounded adult use and outside our scope here.)
Starting Full vs. Ramping Up
Two camps:
Start full. Jump straight to the target dose on night one. Sermorelin's side effect profile at standard doses is mild enough that titration wastes time. The patient benefits from the first night.
Ramp up. Begin at half the target for one to two weeks, then step up. This lets you identify any sensitivity to flushing, injection-site irritation, or sleep disruption before going to full freight.
My honest opinion: the ramp-up costs you almost nothing and buys peace of mind, especially for first-time injectors and older patients. Two weeks at half dose is not going to derail anyone's timeline.
Cycling Schedules: 5-on-2-off and 6-Month Blocks
A perennial debate. Some protocols dose seven nights straight. Others use five nights on, two off (the off days are sometimes fixed as weekends, sometimes rotated).
The case for 5-on-2-off: intermittent dosing may preserve receptor sensitivity at the pituitary and reduce the risk of long-term feedback blunting.
The case for continuous dosing: sermorelin's short half-life and pulsatile action already mimic natural physiology. Human evidence that 5-on-2-off produces better outcomes than continuous dosing at the same weekly total is thin.
Most published clinical research used continuous dosing. Compounded protocols lean toward 5-on-2-off partly out of practitioner preference, partly because it saves patients roughly 28% on monthly peptide cost. Talk to your prescriber about which fits your situation.
For longer cycles, a common pattern is six months of nightly dosing followed by a one-month break before resuming. The break gives the hypothalamic-pituitary axis a reset window and gives your clinician a clean IGF-1 reading uninfluenced by the current dose. Other prescribers skip the break entirely and just recheck IGF-1 every three to four months.
Tapering and Stopping
Two situations where stepping down matters:
Coming off after a long course. A two-to-three-week taper is gentler than stopping cold, though sermorelin doesn't cause the kind of HPA-axis rebound that demands formal tapering. Many patients simply stop without incident.
Reducing dose because of elevated IGF-1 or side effects. Cut the dose by 50% for two weeks, recheck labs. If IGF-1 normalizes and symptoms resolve, hold the lower dose or discuss further adjustments with your prescriber.
Monitoring Labs
A reasonable panel for adults on sermorelin:
- Baseline: IGF-1, fasting glucose, HbA1c, lipid panel, comprehensive metabolic panel
- Three months: repeat IGF-1, fasting glucose, HbA1c
- Annually: full repeat panel
The target IGF-1 range varies by lab and clinician, but it commonly sits in the upper half of the age-adjusted normal range. Pushing IGF-1 above the normal range is not the goal of physiological sermorelin therapy. If your IGF-1 is climbing past the top of the reference range, your dose is too high. Full stop.
FAQ
What is the typical sermorelin dose for adults? Most compounded adult protocols use 200 to 500 mcg subcutaneously at bedtime. A prescriber sets the exact dose based on labs, age, body weight, and goals.
Should I inject sermorelin in the morning or at night? Bedtime injection aligns with the body's natural overnight GH pulse and is the standard timing in most protocols.
How long until I see results? Sleep improvements can appear within the first one to two weeks. Body composition changes generally take 8 to 12 weeks of consistent dosing. Individual responses vary depending on age, baseline GH status, and adherence.
Do I need to cycle sermorelin? Some prescribers use 5-on-2-off or 6-month cycles with a break; others dose continuously. The clinical evidence doesn't strongly favor one approach over the other.
What happens if I miss a dose? A single missed dose has minimal effect. Skip it and resume the next night at the normal time. Do not double up.
Can I reconstitute with sterile water instead of bacteriostatic water? Bacteriostatic water contains a preservative (typically 0.9% benzyl alcohol) that inhibits microbial growth across the multi-dose vial's lifespan. Sterile water is preservative-free and should only be used if the entire vial will be consumed in one injection, which is almost never the case with sermorelin.
---
Sermorelin is not FDA-approved for the treatment of any condition in adults. Compounded sermorelin is prepared by licensed pharmacies for individual patients based on a prescriber's clinical judgment. This article is educational only and does not constitute medical advice. Talk to a qualified clinician before starting any peptide therapy.
Related reading: Sermorelin Benefits and Research | Sermorelin Side Effects Explained | Sermorelin Results Timeline | Sermorelin for Sleep | Order Compounded Sermorelin