Peptide Therapy: Approved Medicines, Experimental Peptides and What the Evidence Shows

What is peptide therapy?

Peptides are short chains of amino acids, the building blocks of proteins. Your body makes hundreds of them to act as hormones and signals. “Peptide therapy” is a broad term that covers two very different groups:

1. Approved peptide medicines. These have passed clinical trials and regulatory review. Examples include insulin, GLP-1 receptor agonists used for diabetes and weight management, and certain bone-building and hormone-related drugs.
2. Research or “grey market” peptides. These include BPC-157, TB-500 (a fragment related to thymosin beta-4), various growth hormone secretagogues and many others. They are widely promoted online for healing, muscle, fat loss or anti-ageing, but most have no regulatory approval for human use.

This page is meant to inform. We think patients deserve a clear picture before deciding anything.

How do peptides work?

Each peptide binds to specific receptors and triggers a signal. GLP-1 drugs, for example, act on receptors that affect insulin release, stomach emptying and appetite. BPC-157 is claimed to promote tissue healing through blood vessel growth and growth factor signalling, based mostly on rodent studies. Because each peptide acts differently, it is not accurate to talk about “peptides” as a single therapy with shared benefits or risks.

Evidence by peptide

Peptide	Regulatory status (US/UK/AU)	Human evidence
GLP-1 receptor agonists	Approved for diabetes and, some, weight management	Strong, large trials
Insulin and other hormone peptides	Approved for specific conditions	Strong
BPC-157	Not approved; FDA has flagged safety concerns for compounding	Very limited; mostly animal studies. PubMed
TB-500 / thymosin beta-4 fragments	Not approved	Very limited
GHK-Cu (copper peptide)	Cosmetic topical use common; injectable not approved	Small cosmetic studies
Growth hormone secretagogues (e.g. ipamorelin, CJC-1295)	Not approved for anti-ageing	Limited; banned in sport

The US FDA maintains guidance on human drug compounding and has identified several popular peptides, including BPC-157, as bulk substances that may present significant safety risks. The WADA Prohibited List bans many of these peptides in sport.

Why caution matters

Products bought online as “research chemicals” may contain the wrong substance, the wrong dose, or bacterial contamination. Injecting an unregulated product carries a real risk of infection and unknown long-term effects. Some peptides that stimulate growth pathways raise theoretical concerns about cancer growth that have not been ruled out. For these reasons we do not supply research peptides, and we would rather explain why than sell a product without evidence.

Red flags when someone offers you peptides

Peptides are heavily marketed on social media and in gyms. Be cautious if:

• The product is labelled “for research use only” or “not for human consumption” but you are told to inject it.
• There is no prescription, no medical history and no doctor involved.
• You are promised fast healing, fat loss or “reverse ageing” with no mention of side effects.
• The seller cannot give you a certificate of analysis from an independent laboratory.
• Several peptides are “stacked” together with no explanation of why each is needed.
• You are discouraged from telling your own doctor.

These are the same warning signs we describe in our guide on how to choose a stem cell clinic. Good medicine is transparent about what it does not know.

Who might discuss peptide therapy with a doctor?

• People with type 2 diabetes or obesity who may benefit from an approved GLP-1 medicine, prescribed and monitored appropriately. See our type 2 diabetes guide.
• People exploring a structured longevity program who want an evidence-based opinion on what is worth considering and what is not.
• Patients with tendon or joint injuries who want to understand better-studied options, such as PRP therapy or stem cell therapy.

Who should not use unapproved peptides?

• Anyone with a current or past cancer.
• Pregnancy, breastfeeding or trying to conceive.
• Competitive athletes subject to anti-doping rules.
• People with significant heart, kidney or liver disease.
• Anyone who cannot verify the source, purity and sterility of a product.

Risks and side effects

Approved peptides have well-documented side effects; GLP-1 drugs, for example, commonly cause nausea and digestive upset, and need monitoring. For unapproved peptides, reported effects include injection-site reactions, flushing, dizziness, fluid retention and changes in blood sugar, but the real risk profile is unknown because large human studies have not been done.

Conventional foundations first

For healing after injury, physiotherapy and graded loading are the foundation. For body composition and metabolic health, nutrition, resistance training and approved medicines where indicated have the best evidence. For healthy ageing, see our longevity program and NAD+ IV therapy pages for an honest view of what is proven.

How a peptide consultation works in Bangkok

1. WhatsApp consultation. Tell us your goals and current medications or supplements, including anything you already inject.
2. Send recent blood tests and reports, or arrange a health check in Bangkok.
3. Doctor review. A Thai Medical Council-licensed doctor reviews safety and evidence for your situation.
4. Personalised program. Where appropriate, this focuses on approved or well-studied options and explains anything that is experimental.
5. In-clinic visit. Examination, baseline tests and, if a treatment is agreed, the first dose under supervision.
6. Follow-up. Monitoring plan and WhatsApp check-ins; a letter for your home doctor on request.

See how it works for the full patient journey.

Safety and quality

Any medicine used in our programs must be legally sourced with traceable documentation. Where a program includes cell-based therapy, cells are prepared in ISO 9001:2015-certified partner laboratories. Our editorial policy explains how we decide what to recommend, and our medical disclaimer explains the limits of online information.