| Cover | Jan. 23, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 23, 2025 |
| Entity File Number | 001-41934 |
| Entity Registrant Name | FibroBiologics, Inc. |
| Entity Central Index Key | 0001958777 |
| Entity Tax Identification Number | 86-3329066 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 455 E. Medical Center Blvd. |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77598 |
| City Area Code | (281) |
| Local Phone Number | 671-5150 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.00001 per share |
| Trading Symbol | FBLG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
