Sermorelin + Ipamorelin Stack: The Classic GH Combo (2026)
Why the GHRH + ghrelin pathways synergize, typical combined dosing, cycle structure, cost, and who actually needs the stack.
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Short answer
Sermorelin + ipamorelin is the most prescribed peptide combination in longevity medicine — not because of marketing, but because the mechanism makes sense. Two different receptors trigger the same GH release; stimulating both produces a bigger pulse than either alone. The combo is the default for people who want maximum effect from injectable GH peptides without crossing into HGH territory.
Why the two mechanisms complement
- Sermorelin: mimics GHRH — the hypothalamus's own 'release growth hormone' command. It's the timing signal; it tells the pituitary when to pulse.
- Ipamorelin: mimics ghrelin at the GHS-R receptor — a separate trigger on the same pituitary. It's the amplitude booster — a sharper, stronger pulse per dose.
- Together: the GHRH pathway provides the physiological context; the ghrelin pathway amplifies the output. Synergy, not redundancy.
Typical combined protocol
| Element | Common convention |
|---|---|
| Dose | 200-300 mcg each, combined in one injection |
| Timing | Bedtime, 30+ min after last meal (insulin blunts GH) |
| Frequency | Nightly, 5 days on / 2 off |
| Cycle | 3-6 months, then reassess with labs |
| Monitoring | IGF-1 at baseline and ~6-8 weeks in |
These are community/clinic conventions — your prescriber adjusts from your baseline IGF-1, age, body composition, and goals. The combo exists in single-vial blends and as separate vials; the blend simplifies the nightly injection.
Who the stack actually fits
- Maximum GH effect without HGH: the ceiling of secretagogue therapy — this is where it lives.
- Plateaued on single peptide: if sermorelin alone produced modest results after 3 months, the combo is the standard escalation.
- Recovery-intensive goals: athletes and high-training-volume users where pulse amplitude matters.
- Not for: minimal goals, tight budgets, or first-timers who haven't established single-peptide tolerance.
Cost and access
Combo protocols run a modest premium over single-peptide programs — the peptide cost roughly doubles while overhead stays flat, so you're not paying 2x total. Licensed telehealth programs that offer the combo handle labs, physician review, and blending — you inject once nightly, they handle the formulation.
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