What should a doctor's letter say?

It should state your name, the compound names, dosage, form (injectable), quantity, and medical necessity. It should be on official letterhead with the physician's license number.

Can I get a letter for research peptides?

Some physicians will write a letter for research-grade peptides describing them as 'compounds under therapeutic evaluation.' This is not a prescription but helps at customs.

What if I don't have a prescription?

In the US, UK, and most EU countries, a prescription is not legally required for unscheduled peptides. A physician letter is always recommended. In Australia, Japan, and Singapore, a prescription is mandatory.

TSA & Security

February 3, 2026 · 5 minutes read

Do I Need a Doctor's Note for Peptides on a Plane?

Doctor's note for peptide travel: when it's required, when it helps, and a free template. Research-grade peptide rules explained.

When a Doctor's Note Is Legally Required

Japan (Yunyu Kakunin-sho process), UAE (MOHAP approval), Australia (TGA personal importation), and Singapore (HSA declaration) all legally require medical documentation for pharmaceutical imports.

When It Helps But Isn't Required

In the USA, UK, and most EU countries, a physician letter is not legally required for unscheduled peptides. However, it dramatically reduces friction at customs and prevents confiscation of ambiguous compounds.

When It Makes No Difference

Thailand, Canada, and Mexico have relaxed import rules for personal-use quantities. A doctor's note adds no practical advantage, though carrying one is never harmful.

What Customs Officers Actually Ask

"What are these?" and "Do you have a prescription?" are the two most common questions. A calm, prepared answer with documentation ready ends 95% of customs interactions in under 60 seconds.

Digital vs Paper Copies

Always carry both. Lead with a printed letter — customs officers in most countries prefer physical documents. Have a digital backup on your phone in case the paper is lost or damaged.

Download our document templates on the Basic Packing List.

Need emergency resources?

If your peptides were confiscated, compromised, or you need emergency contacts — visit the SOS Registry.

Peptide Travel Editorial Team

Independent researchers and performance travelers with firsthand experience navigating customs across 30+ countries. Our guides are written from direct travel experience and cross-referenced against official customs and regulatory sources.

This content is reviewed quarterly and updated when regulations change. Last reviewed: May 2026

Not medical advice. Always consult your physician before traveling with any pharmaceutical compounds. Verify all regulations with official government sources.

Last updated: May 2026
Not medical advice. Always consult your physician and verify regulations with official customs authorities.

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