XML 17 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover
 12 Months Ended
Jun. 30, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
ICFR Auditor Attestation Flag false
Amendment Flag false
Document Period End Date Jun. 30, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Information [Line Items]  
Entity Registrant Name REGENCELL BIOSCIENCE HOLDINGS LIMITED
Entity Central Index Key 0001829667
Entity File Number 001-40617
Entity Incorporation, State or Country Code E9
Current Fiscal Year End Date --06-30
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 9/F Chinachem Leighton Plaza
Entity Address, Address Line Two 29 Leighton Road
Entity Address, City or Town Causeway Bay
Entity Address, Country HK
Entity Address, Postal Zip Code 0000
Entity Listings [Line Items]  
Title of 12(b) Security Ordinary shares, par value $0.00001
Trading Symbol RGC
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 494,488,908
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Yat-Gai Au
Entity Address, Address Line One 9/F Chinachem Leighton Plaza
Entity Address, Address Line Two 29 Leighton Road
Entity Address, City or Town Causeway Bay
Entity Address, Country HK
Entity Address, Postal Zip Code 0000
Entity Phone Fax Numbers [Line Items]  
City Area Code 852
Local Phone Number 2155 0823