GB-115, also written GB115, is a synthetic dipeptide studied mainly for anxiety-related effects through cholecystokinin receptor pathways. It is not part of Chia’s current treatment catalog, and online products marketed as “research peptides” are not the same as clinician-prescribed medication. Patients should avoid self-use and discuss anxiety symptoms with a licensed clinician.
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See if you qualify →What is GB-115 peptide?
GB-115 is a lab-made, or synthetic, dipeptide. A dipeptide is a small molecule built from two amino-acid-like parts. It has been studied as a central cholecystokinin receptor antagonist, meaning it may affect a stress and anxiety signaling system in the brain 1.
Names and identifiers: GB-115, GB115, and N-(6-phenylhexanoyl)glycyl-L-tryptophanamide
You may see this compound listed as GB-115, GB115, Ranquilon, or N-(6-phenylhexanoyl)glycyl-L-tryptophanamide. Some research-market pages also list a CAS number and chemical formula, but those details do not make a product appropriate for human use 5.
How it differs from common wellness peptides
GB-115 is different from wellness peptides that patients may hear about for skin, metabolism, or growth-hormone signaling. For example, Chia offers GHK-Cu cream, NAD+, and sermorelin only after an online health review by a licensed U.S. provider, when clinically appropriate. GB-115 is not in our catalog.
Why are people searching to buy GB-115?
GB-115 searches often come from people looking for non-benzodiazepine anxiety options. The interest is understandable, but online availability does not mean a compound is approved, safe, effective, or legally appropriate for self-use.
Interest in non-benzodiazepine anxiety pathways
Benzodiazepines work mainly through GABA signaling. GB-115 is discussed in the literature through cholecystokinin pathways instead, which is why some people search for it as a different kind of anxiety-related compound 1. That mechanism is interesting, but it does not replace a full medical evaluation.
Confusion between research chemicals and prescription treatment
A common mistake is to treat a research listing like a prescription option. FDA advises patients to obtain prescription medicines with a prescription from a clinician and through a state-licensed pharmacy, and to use BeSafeRx resources when checking online sources 2.
What research use only labels usually mean for consumers
Many online peptide sellers state that products are for laboratory research use only and not for human consumption. Those statements matter. They usually mean the product is not being sold as a clinician-prescribed medication for a patient, even if the website also uses wellness-like language 7.
What benefits has GB-115 been studied for?
GB-115 has been studied mainly for anxiety symptoms, including research in people with generalized anxiety disorder. The honest answer is that the human evidence is limited, and it should not be read as proof that people should buy or self-use GB-115.
Generalized anxiety disorder research
A published clinical article describes GB-115 in patients with generalized anxiety disorder and frames it as a central antagonist of cholecystokinin-1 receptors 1. That is human research, which is more relevant than animal or cell work, but one clinical literature stream is not the same as U.S. FDA approval.
Cholecystokinin signaling and stress response
Cholecystokinin, or CCK, is a signaling peptide involved in digestion and brain signaling. CCK-4 has been used in anxiety and panic research, and GB-115 is often described as a CCK-related analog or antagonist in research-market summaries 5.
What the evidence does not prove
The evidence does not prove that an online GB-115 product has the right identity, dose, purity, stability, or safety profile for a person. FDA notes that unapproved products do not go through FDA review for safety, effectiveness, and quality before marketing 2.
How is GB-115 thought to work?
GB-115 is thought to work through cholecystokinin receptor pathways, especially central CCK signaling. Mechanism matters, but mechanism alone does not prove real-world benefit or safety.
Cholecystokinin receptors and anxiety signaling
Cholecystokinin receptors are often divided into CCK-1 and CCK-2 receptor subtypes. GB-115 literature and research-market descriptions use this receptor language to explain possible effects on stress and anxiety signaling 1.
Why receptor subtype claims can be confusing
Receptor subtype claims can be hard to interpret because different sources describe GB-115 with different wording, including CCK-1, CCK-2, and CCK-4-related language 5. For patients, the key point is simpler: receptor theory is not the same as a proven treatment plan.
Why mechanism studies do not prove real-world benefit
Peptide drug development has to answer practical questions, including pharmacokinetics, hepatic impairment, drug-drug interactions, QTc risk, and immunogenicity risk 4. Those issues are part of why a promising mechanism is not enough for safe self-use.
Is GB-115 FDA approved or available by prescription in the United States?
GB-115 is not FDA-approved as a prescription medicine in the United States. We also do not offer it at Chia.
FDA approval status versus research chemical sales
FDA approval means the agency has reviewed a drug for a specific use based on submitted evidence. A research chemical listing, certificate of analysis, or online store page is not the same thing as FDA approval or a prescription from a licensed clinician 2.
Why foreign or research-market availability does not equal safe patient access
Some sources connect GB-115 with the name Ranquilon and describe non-U.S. pharmaceutical or research use 5. That does not establish U.S. prescription availability, U.S. quality oversight, or a safe path for a patient to use it.
What to ask a clinician if you are seeking anxiety treatment
- Could my symptoms be anxiety, panic, depression, thyroid disease, medication side effects, substance use, or another medical issue?
- Do I need urgent support because of suicidal thoughts, unsafe behavior, severe insomnia, or panic symptoms?
- Which evidence-based options fit my history, current medicines, pregnancy status, and goals?
- What side effects, interactions, and follow-up plan should I understand before starting any treatment?
What are the risks of buying GB-115 online?
Research-use-only GB-115 sold online can come with major gaps: no clinician screening, uncertain quality, unclear storage, and no FDA review for patient use. A certificate or purity claim does not replace medical care.
No clinician screening or prescription
FDA lists lack of screening and prescription by a licensed doctor as a warning sign for online medication sources 2. This matters for anxiety symptoms because the right next step depends on diagnosis, safety risks, other medicines, and medical history.
Unknown quality, identity, dose, sterility, or storage
Online listings may mention purity testing, liquid concentration, storage instructions, or certificates of analysis 8. Those details may be useful for laboratory research, but they do not prove that a product is sterile, stable, correctly dosed, or appropriate for a person.
Misleading claims and human-use disclaimers
Some research-market pages combine scientific language with disclaimers such as “not for human consumption” 7. If a product is not intended for human, veterinary, or food use, a patient should not treat it like a medication.
| Question | Licensed prescription pathway | Research-chemical website |
|---|---|---|
| Is there a clinician review? | A licensed clinician evaluates symptoms, history, contraindications, and medication interactions. | Often no clinical screening or diagnosis is required. |
| Is there a prescription? | Medication is prescribed only when clinically appropriate; a prescription is never guaranteed. | Products may be sold as research-use-only materials, not patient prescriptions. |
| Where is it filled? | Prescription medicines should be filled through a state-licensed pharmacy when prescribed. | The seller may not be a pharmacy and may not be dispensing for patient care. |
| What quality oversight applies? | Pharmacies and clinicians operate under healthcare rules; FDA-approved drugs have FDA-reviewed labeling, and compounded drugs have different oversight. | Purity claims or COAs do not equal FDA approval or patient-use review. |
| What happens if side effects occur? | The patient can contact the prescribing care team or seek urgent care as needed. | There may be no clinician responsible for follow-up. |
Does Chia offer GB-115?
Chia does not offer GB-115. It is not in our current public treatment catalog, and we do not prescribe, compound, sell, or ship it.
GB-115 is not in Chia’s current treatment catalog
At Chia, our available treatments are limited to the therapies in our live catalog. Examples include compounded GLP-1 treatment such as semaglutide injection and tirzepatide tablets or injection, as well as select longevity and hormone therapies. That list does not include GB-115.
Chia only offers listed treatments after clinician review
For treatments we do offer, care starts with a 100% online health questionnaire. A licensed U.S. provider reviews the information and prescribes only when clinically appropriate. Medications are compounded by state-licensed 503A pharmacies in the U.S. and shipped to the patient’s door when prescribed.
When Chia is not the right path
If your main concern is anxiety, panic, severe insomnia, suicidal thoughts, substance-use concerns, pregnancy, or complex psychiatric history, a primary care clinician, psychiatrist, therapist, or urgent evaluation may be the better first step. Chia’s catalog is not a substitute for emergency or psychiatric care.
What safer steps should someone take instead of self-experimenting?
The safer next step is a licensed clinician evaluation, not a research peptide order. Anxiety symptoms can be treatable, but the safest plan depends on the cause, severity, risks, and other medicines.
Talk with a licensed clinician about anxiety symptoms
A clinician can screen for medical causes, review current medications, ask about panic symptoms and sleep, and decide whether therapy, lifestyle changes, prescription medication, urgent care, or specialty referral makes sense. If symptoms feel unsafe or include suicidal thoughts, seek urgent help now.
Ask about evidence-based options and contraindications
For anxiety care, evidence-based options may include psychotherapy, medication, sleep care, substance-use support, or treatment of underlying medical conditions. A clinician can also check contraindications and interactions, which research-use sellers do not do.
Use FDA BeSafeRx principles when evaluating any online medication source
FDA recommends getting prescription medicines with a prescription from a doctor and filling them at a state-licensed pharmacy 2. If a site sells a product for human use without a real medical review, or uses deep discounts and vague claims, treat that as a red flag.
FAQ
GB115, also written GB-115, is a synthetic dipeptide also called N-(6-phenylhexanoyl)glycyl-L-tryptophanamide. It has been studied mainly for anxiety-related effects through cholecystokinin receptor pathways.
GB-115 has been studied for anxiety symptoms, including generalized anxiety disorder. The available evidence is limited and does not prove that people should buy or self-use GB-115.
Some sources list Ranquilon as a pharmaceutical name associated with GB-115. That does not mean GB-115 is FDA-approved or available by prescription in the United States.
No. GB-115 is not FDA-approved as a prescription medicine for anxiety in the United States.
A certificate of analysis may describe a test result for a batch, but it does not replace FDA approval, clinician screening, sterile handling, dosing guidance, or follow-up care. Research-use-only products are not the same as prescribed medicines for human use.
No. GB-115 is not in Chia’s current public treatment catalog. Chia does not offer, prescribe, compound, sell, or ship GB-115.
Do not start or continue using it without medical supervision. If you have used it and feel unwell, contact a licensed clinician or seek urgent care. If you have severe anxiety, panic symptoms, suicidal thoughts, chest pain, confusion, or trouble breathing, seek emergency help.
References
- 1.Clinical effects of central antagonist of cholecystokinin-1 receptors GB-115 in patients with generalized anxiety disorder. European Psychiatry. 2022.
- 2.U.S. Food and Drug Administration. FDA’s Concerns with Unapproved GLP-1 Drugs Used for Weight Loss. FDA. 2026.
- 3.Clinical effects of central antagonist of cholecystokinin-1 receptors GB-115 in patients with generalized anxiety disorder. European Psychiatry. 2022.
- 4.U.S. Food and Drug Administration. Clinical Pharmacology Considerations for Peptide Drug Products. Guidance Document. 2023.
- 5.Kimera Chems. GB-115: CCK-4 Retro-Analog and the Receptor Question. 2026.
- 6.Exploring FDA-Approved Frontiers: Insights into Natural and Synthetic Peptides. 2024.
- 7.Umbrella Labs. GB-115 30ML Liquid Product Information and Research-Use Notice. 2026.
- 8.EveryChem. GB-115 Spray Solution Product Information. 2026.
About this article
Chia Health Editorial Team — Evidence-reviewed health education
This article is for educational purposes only and is not a substitute for individualized medical advice. Talk to a licensed clinician before starting, stopping, or changing any prescription.
AI tools may assist with research and drafting. Chia's editorial team reviews source use, clarity, treatment information, and safety framing before publication. A clinician is named only after explicit sign-off. Read our editorial standards.
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