Summary of significant accounting policies (Details) |
12 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| ZY Holdings [Member] | ||
| Place of incorporation | Cayman Islands | |
| Date of incorporation | Jul. 05, 2016 | |
| Business engaged | Investment holding | |
| Effective ownership percentage | 100.00% | 100.00% |
| China Bio [Member] | ||
| Place of incorporation | Republic of Seychelles | |
| Date of incorporation | Jun. 27, 2016 | |
| Business engaged | Investment holding | |
| Effective ownership percentage | 100.00% | 100.00% |
| ZY HK [Member] | ||
| Place of incorporation | Hong Kong | |
| Date of incorporation | Jun. 13, 2016 | |
| Business engaged | Investment holding | |
| Effective ownership percentage | 10.00% | 100.00% |
| ZY Shenzhen [Member] | ||
| Place of incorporation | PRC | |
| Date of incorporation | Jun. 10, 2014 | |
| Business engaged | Investment holding | |
| Effective ownership percentage | 100.00% | 100.00% |
| BF Beijing [Member] | ||
| Place of incorporation | PRC | |
| Date of incorporation | Aug. 30, 2012 | |
| Business engaged | Nervonic acid research, development of nervonic acid based herbal and chemical drugs and the sales of health supplements continuing nervonic acid | |
| Effective ownership percentage | 100.00% | 100.00% |
| Dandong BF [Member] | ||
| Place of incorporation | PRC | |
| Date of incorporation | Mar. 11, 2019 | |
| Business engaged | Research, development and growing of Acer truncatum seedlings | |
| Effective ownership percentage | 100.00% | 100.00% |