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Related parties (Details) - USD ($)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Related Party Transaction    
Related party payables $ 54,588 $ 46,649
Xiaofeng Gao [Member]    
Related Party Transaction    
Equity method investment, ownership percentage 25.10%  
Xiaofeng Gao    
Related Party Transaction    
Related party payables $ 2,199 2,542
Expense paid by Xiaofeng Gao 3,178 2,443
Repayment to related party 3,514 256,972
Xuejun Ji    
Related Party Transaction    
Related party payables 11,642  
Bin Fu    
Related Party Transaction    
Related party payables 40,747 44,107
Repayment to related party   7,802
Amounts received   $ 43,693
Medical Star    
Related Party Transaction    
Sales to related parties $ 45,762