Sermorelin Dosage: Where the Numbers Come From

Search sermorelin dosage and you will find confident, specific protocols — a microgram figure, nightly, before bed, on an empty stomach, five days on and two off. They agree with each other closely enough to look like consensus.

The question worth asking is where that consensus came from, and the answer is not a trial in healthy adults. The circulated protocols trace to clinic practice, historical use in a different population, and each other. That does not make them arbitrary, and it does not make them wrong. It does mean they carry a different kind of authority than a labeled dose, and the difference is worth understanding before you follow one.

This page covers both halves: where the numbers came from, and — more practically — how to convert whatever number you have been given into a mark on a syringe without getting it wrong.

What Sermorelin Is Actually Doing

Sermorelin is a growth-hormone-releasing hormone analog. It does not supply growth hormone; it signals the pituitary to release more of its own. That mechanism is real and uncontroversial.

Everything about dosing follows from one property: the effect is pulsatile and self-limiting. You are asking a gland to do something it already does on a rhythm, not topping up a hormone directly. That is why protocols specify timing — nightly, before bed — to align with the body's own overnight GH pulse, and it is also why "more" does not scale the way it would with a directly administered hormone. The pituitary's capacity to respond is the ceiling, not the syringe.

Two consequences that matter. Timing is a bigger lever than quantity in these protocols, which is why every circulated version specifies when far more precisely than it justifies how much. And the dose-response question is genuinely under-studied in healthy adults, which is why the protocols agree — they are copying one another rather than converging on evidence.

Why "More" Is Not the Goal

Worth pausing on, because the instinct in this category is always to escalate.

The endpoint sermorelin is working toward has been tested directly, with growth hormone itself, at doses a study could control. The pooled human evidence in healthy participants found increased lean body mass that reviewers attributed largely to fluid retention rather than functional muscle, no improvement in strength or exercise capacity, and more adverse events¹.

That is the ceiling on what the pathway delivers, established at the most direct point of intervention available. Sermorelin sits one step further back, asking the pituitary for more of the hormone that already failed to show functional benefit when supplied directly. Raising the dose does not move that finding; it moves you further along a curve whose destination has been mapped.

The founding study of this entire field — growth hormone in men over 60, six months, body composition and skin thickness² — is the one everyone cites and the one whose limitations get least attention. We take that history apart in peptides for anti-aging.

The Timing Claim, and the Study That Complicates It

Every protocol says the same thing: inject at night, because GH release and deep sleep travel together, so dosing before bed rides the natural pulse.

The correlation is real. The causal reading has been tested from the other direction, and it does not hold as neatly as the protocols assume. Blocking endogenous GHRH receptors dissociated nocturnal growth hormone secretion from slow-wave sleep³ — the two can be pulled apart, which means one is not simply driving the other.

And the sleep benefit usually attached to nightly dosing has its own controlled result. Systemic GHRH impaired sleep in healthy young women in a randomized, EEG-monitored study⁴. Fuller treatment in peptides for sleep.

So night-time dosing is defensible on physiological grounds and it is not the well-established practice the uniformity of the protocols implies.

The Arithmetic — Micrograms, Milligrams and Unit Marks

This is the practical half, and it is where errors actually happen.

Sermorelin is dosed in micrograms. Vials are labeled in milligrams. Syringes are marked in units. Three scales, and the conversion between them depends on a number that is different for every vial.

Start with the fixed relationship: on a U-100 insulin syringe, 100 units span 1 mL — always, for every U-100 syringe, regardless of contents. That part never changes.

Then the variable: concentration = vial strength ÷ water volume. A 5 mg vial reconstituted in 2 mL is 2.5 mg/mL, which is 2,500 mcg/mL. Since one unit is 0.01 mL, each unit mark carries 25 mcg. So a 300 mcg dose is 12 units.

Now change one thing. Put that same 5 mg vial in 1 mL instead and the concentration doubles to 5,000 mcg/mL — each unit mark now carries 50 mcg, and the same 300 mcg dose is 6 units.

Same vial. Same drug. Same syringe. Half the marks.

That is why a dose written in units, copied from a forum or a friend, is not information — it was correct for their vial's water volume, not yours. The water you add is the decision that sets everything downstream, which is why it deserves more attention than it usually gets.

Our peptide calculator handles this conversion, the bacteriostatic water calculator solves the water volume before you mix, and the insulin syringe units converter covers the underlying relationship on its own. The general procedure is in how to reconstitute peptides and how to inject peptides.

The Five-On, Two-Off Pattern

Nearly every circulated protocol includes a break — five nights on and two off, or three weeks on and one off — justified by preventing pituitary desensitization.

The underlying concern is real in principle: continuous stimulation of a receptor can reduce its responsiveness, and a pulsatile system is more vulnerable to that than most. So the reasoning is not invented.

What is missing is the part that would make it a protocol rather than a precaution. No study in healthy adults establishes that desensitization occurs on any particular schedule, or that a two-day break prevents it, or that five days is the right number. The specific pattern is a convention that spread because it sounds physiologically careful, and it may well be — but it is a plausible practice presented with the confidence of a finding.

This is the recurring shape across peptide dosing generally: the mechanism justifies that something should be done, and the specific numbers come from somewhere else entirely. Worth holding both thoughts at once rather than collapsing into either "it's all made up" or "it's the established protocol".

Prescribed Versus Research-Chemical

The dosing question splits depending on where the vial came from, and the split matters more than the number.

Through a prescriber, sermorelin is compounded and dispensed with a schedule from a clinician who can adjust it. Some desks sell oral or troche formats instead of injections, which changes the arithmetic entirely — a troche has no syringe conversion and no reconstitution decision.

Through a research-chemical vendor, you are setting your own dose from a protocol you found, with no regulatory floor under identity, purity or sterility. See peptide vendor red flags, how to verify a COA and are peptides legal.

Formats and prices vary more than most people expect. RxSpan MD sells an oral dissolving tablet only, at a genuine $179 month-to-month rate. LaSara publishes a one-time price, a subscription price and a per-day cost on every product page — $360 or $288 subscribed for sermorelin. Try Ageless sells three formats — injection, troche and nasal spray — and its injection page shows $126 in the buy box against $239–$289 in its own product table for the identical 15 mg product.

Others obscure the monthly figure: Hone Health's page shows "$130/mo" when the real cost is $285 because the product requires a $155 membership, and fourteen states plus D.C. cannot buy it. Rylo Health advertises "$183/mo", which is $549 every three months; monthly it is $249.

Board: best sermorelin providers, figures in the price transparency index, everything on the rankings index.

Anti-Doping

Unambiguous: GH secretagogues and GH-releasing factors are prohibited in tested sport, in their own class. The dose does not matter and the reason does not matter. Check with our WADA prohibited-status checker and see the 2026 Prohibited List for peptides.

Bottom Line

On the schedule: the confident protocols circulating online come from clinic practice and from one another rather than from a dose-response trial in healthy adults. They are not arbitrary, and they are not a labeled dose. Night-time timing is physiologically defensible, though the GH-and-deep-sleep link it rests on has been experimentally dissociated³, and the sleep benefit usually promised alongside it has a controlled result pointing the other way in women⁴.

On escalating: the pathway's ceiling has been mapped at a more direct point of intervention. Pooled human evidence on growth hormone found lean-mass gain that was largely fluid, no strength or exercise-capacity improvement, and more adverse events¹. A higher sermorelin dose does not change that destination.

On the arithmetic: micrograms are the dose, units are a distance on a barrel, and concentration is the only bridge. A 5 mg vial in 2 mL gives 25 mcg per unit mark; the same vial in 1 mL gives 50. Never copy a unit number — get the dose in micrograms, read your own vial's concentration, and convert it yourself with the peptide calculator.

For what the results actually look like and how to test them on yourself, see sermorelin before and after. This page is educational and not medical advice — dosing belongs with a licensed clinician.