Peptide Laws in Japan
JP · Asia-Pacific · 23 peptides tracked
Are Peptides Legal in Japan?
Japan is one of the stricter countries for peptides — all peptide products require approval from the PMDA, and importing unapproved substances can result in seizure and legal consequences. Do not attempt to bring research peptides into Japan. Approved GLP-1 medications like semaglutide are available by prescription through Japanese healthcare providers. Travelers carrying even prescription peptides should bring documentation from their doctor.
4
Legal15
Grey Area4
PrescriptionCan You Buy Peptides in Japan?
4 peptide(s) are legal to buy in Japan, including GHK-Cu, NAD+, Glutathione, Vitamin B12. 4 peptide(s) require a valid prescription, including Tirzepatide, Semaglutide, HGH, Liraglutide. 15 peptide(s) fall into a legal grey area: Retatrutide, Selank, MOTS-c, TB-500, AOD-9604, and 10 more. These may be available for research purposes but their legality for personal use is ambiguous.
Traveling to Japan with Peptides
When traveling to Japan with peptides, the legality depends on each peptide's classification. Prescription peptides (Tirzepatide, Semaglutide, HGH, Liraglutide) typically require documentation such as a prescription or doctor's letter when crossing borders. Enforcement in Japan is rated as "Strict." Always declare pharmaceutical products at customs and carry documentation of any prescriptions.
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Peptide Regulations in Japan
| Peptide | Status | Rx Required | Schedule | Detail | Source |
|---|---|---|---|---|---|
| Retatrutide | Grey Area | No | Investigational | Not approved in any country. Eli Lilly announced on 23 Jul 2026 that it will file for FDA approval in Q1 2027, following five positive late-stage trials. Until then it remains investigational, cannot be lawfully sold for human use, and any product offered online is unapproved. | Official |
| Selank | Grey Area | No | Unapproved Drug | Not PMDA approved. Strict import rules. | Official |
| Tirzepatide | Prescription | Yes | PMDA Approved | PMDA approved. Mounjaro available. Strict prescription. | Official |
| MOTS-c | Grey Area | No | Unregistered | Not specifically regulated. | Official |
| TB-500 | Grey Area | No | Unapproved Drug | Same as BPC-157. Unapproved under PMD Act. | Official |
| GHK-Cu | Legal | No | Cosmetic | Topical/cosmetic use unrestricted. | Official |
| AOD-9604 | Grey Area | No | Unapproved Drug | Unapproved under PMD Act. | Official |
| Semaglutide | Prescription | Yes | PMDA Approved | PMDA approved. Ozempic/Wegovy available. Strict prescription requirement. | Official |
| CJC-1295 | Grey Area | No | Unapproved Drug | Unapproved GH peptide. Strict PMDA framework. | Official |
| Semax | Grey Area | No | Unapproved Drug | Not PMDA approved. Strict import rules. | Official |
| Ipamorelin | Grey Area | No | Unapproved Drug | Unapproved. Same strict framework. | Official |
| NAD+ | Legal | No | Supplement | NMN supplements popular in Japan. Oral supplements available. IV requires medical supervision. | Official |
| BPC-157 | Grey Area | No | Unapproved Drug | No PMDA approval. Treated as unapproved drug under PMD Act. No research chemical exemption. Import limited to 1-month personal supply. | Official |
| DSIP | Grey Area | No | Not Scheduled | Not PMDA-approved. No specific scheduling. Strict pharmaceutical regulations apply. | Unsourced |
| Epithalon | Grey Area | No | Not Scheduled | Not PMDA-approved. | Unsourced |
| Glutathione | Legal | No | Supplement | Oral form: Freely available as dietary supplement. Injectable form: Approved pharmaceutical (Tathion) for liver disease/toxicity, prescription only. | Unsourced |
| HGH | Prescription | Yes | PMDA Approved | PMDA-approved. Biosimilar somatropin approved. Prescription required. | Unsourced |
| KPV | Grey Area | No | Not Scheduled | — | Unsourced |
| Melanotan II | Grey Area | No | Not Scheduled | — | Unsourced |
| Liraglutide | Prescription | Yes | PMDA Approved | PMDA-approved (Victoza, Jan 2010) for type 2 diabetes. Saxenda (weight) NOT approved in Japan. | Unsourced |
| MK-677 | Grey Area | No | Not Scheduled | Not PMDA-approved. Strict PED regulations. | Unsourced |
| Vitamin B12 | Legal | No | Supplement | Oral: FNFC (Food with Nutrient Function Claims), freely available. Injectable (mecobalamin): Approved pharmaceutical, prescription required. | Unsourced |
| PT-141 | Grey Area | No | Not Scheduled | Not PMDA-approved. | Unsourced |
About the sources on this page
Entries marked Official cite a government regulator, legislation or an official gazette. Some entries currently carry no source at all.
We show these entries rather than hiding them, but they should not be relied on. Nothing on this site is legal advice. Verify against the national regulator before acting, and if you can point us at a better source please submit an update.
Data is researcher-verified but not legal advice. Always consult local regulations before purchasing, importing, or traveling with peptides. Last verified: 2026-02-28.