Quick answer: there is no published study showing that sermorelin tablets, troches or under-the-tongue forms work. Every clinical result for sermorelin comes from injections, IV doses or nasal sprays, and its only approved form, Geref, was an injection.[1][2] Peptides like sermorelin are largely broken down in the digestive tract, and even a purpose-built oral peptide drug, oral semaglutide, gets only about 0.4% to 2% of a dose into the blood.[3][5]
This guide explains why sermorelin is injected, what is known about oral, under-the-tongue and nasal forms, what the alternatives are, and what to ask a clinician. For background, see our sermorelin profile and the growth hormone peptides hub.
What sermorelin tablets and troches are
Sermorelin is a 29-amino-acid peptide, a copy of the active part of growth hormone-releasing hormone (GHRH). It tells the pituitary gland to release growth hormone.[1]
The non-injected forms sold today are prepared by compounding pharmacies:
- Tablets or capsules are swallowed.
- Troches are small lozenges that dissolve between the cheek and gum.
- Sublingual drops or tablets dissolve under the tongue.
Geref, the FDA-approved product, came only as injection vials (0.5 mg and 1.0 mg) and a diagnostic ampule (0.05 mg).[2] It was discontinued in 2008, so no approved oral, sublingual or troche product has ever existed.
Why sermorelin is injected
Peptides face two barriers when swallowed:[4]
- Digestion. Stomach acid and protein-digesting enzymes break peptides apart, just as they do with protein in food.
- The gut wall. Peptides are large and water-loving, so they cross the gut lining poorly.
Drug makers have spent decades on this problem. A 2022 review by industry scientists noted that even FDA-approved oral peptide products, which use absorption enhancers, still face low-to-single-digit oral bioavailability.[3] Oral semaglutide is the best-known example: its label estimates that only about 0.4% to 2% of a dose reaches the bloodstream, depending on the tablet, even with a special absorption enhancer called SNAC.[5]
No such enhancer system has been developed or tested for sermorelin. For more on the science, see oral peptide delivery and peptide bioavailability.
Do troches and under-the-tongue forms do better?
In theory, the mouth lining offers a shortcut: it has a rich blood supply, and absorption there skips the first pass through the liver.[4] In practice, a 2025 review describes three obstacles for peptides:[4]
- The lining of the mouth limits how much passes through.
- Saliva washes the dose away quickly.
- Enzymes in saliva can break peptides down.
Researchers are testing nanoparticles and other carriers to get around these problems, but the review notes that clinical translation remains a challenge.[4] None of this research has involved sermorelin, and no study has measured growth hormone or IGF-1 after a sermorelin troche.
What the nasal studies teach
The closest evidence for a needle-free sermorelin comes from nasal sprays tested in the 1990s. They show how much is lost when sermorelin is not injected.
| Study | Who | What happened |
|---|---|---|
| Absorption study[6] | 30 healthy men | Only 3% to 5% of a nasal dose was absorbed. About 50 mcg/kg by nose matched 1 mcg/kg by IV. |
| 6-month pilot[7] | 8 children with growth hormone deficiency | Growth hormone responses shrank over time, 3 developed antibodies, most had sneezing, a runny nose or burning, and 6-month growth did not improve. |
| Sleep study[8] | 12 young and 11 older men | A 300 mcg nasal dose at bedtime changed sleep stages and lowered the early-night growth hormone rise. |
The researchers in the pediatric pilot concluded that nasal GHRH was not suitable in its form at the time, because absorption and effect fell while antibodies and local reactions appeared.[7] If a nasal route, which avoids digestion, needed roughly 50 times the dose, a swallowed tablet faces even steeper odds. For more on this route, see peptide nasal spray vs injection.
What injected sermorelin achieved, for comparison
In the main Geref trial, 110 children injected 30 mcg/kg under the skin at bedtime, and their growth rate rose from 4.1 to 8.0 cm a year at 6 months.[13] That is the benchmark a tablet would need to match, and no oral study exists to compare. For results in adults, see sermorelin results, and for injected doses, see sermorelin dosage.
Why milligrams on the label are hard to compare
A tablet or troche may list a dose in milligrams or micrograms that looks similar to an injected dose. Because no one has measured how much of an oral or under-the-tongue dose is absorbed, those numbers cannot be compared. In the nasal study, it took about 50 times the IV dose to get a similar growth hormone response.[6] A swallowed dose could need far more, or might not work at all.
Oral drugs that do raise growth hormone
If the goal is a pill, two different kinds of compounds are sometimes confused with “oral sermorelin”:
- Macimorelin (Macrilen) is FDA-approved as a single oral dose for diagnosing adult growth hormone deficiency, not for treatment.[10] It mimics ghrelin rather than GHRH. During its validation study, the injectable Geref diagnostic became unavailable in the US, and researchers finished the study with macimorelin alone.[11]
- MK-677 (ibutamoren) is an oral, unapproved growth hormone secretagogue with its own evidence and risks.
Neither is sermorelin, and neither is approved as an anti-aging or body-composition treatment.
Safety and legal status
- Compounded only. Tablets and troches can only come from compounding pharmacies. Compounded drugs are not FDA-approved, and FDA does not verify their safety, effectiveness or quality before they are marketed.[9]
- Black-market risk. USADA warns that sermorelin from unregulated sources may be contaminated or mislabeled.[12]
- Side effects of oral forms have not been studied. Injected sermorelin most often caused temporary flushing and injection-site pain.[1] See sermorelin side effects.
- Sport. Sermorelin is prohibited in sport, and USADA says an exemption is highly unlikely.[12]
This is general information, not legal advice. To vet a pharmacy, see how to check a compounding pharmacy.
Questions to ask a clinician
- What evidence shows this tablet or troche raises growth hormone or IGF-1?
- How will we check whether it is working, for example with an IGF-1 blood test?
- Why choose an oral form over the injected form that was studied?
- Which pharmacy makes it, and how are strength and purity tested?
- Is there an FDA-approved treatment for my condition?
Talk to a licensed clinician before starting any hormone-related treatment.
