Again, homocysteine is not only influenced by the persons B12 status
This 20mg total blend (5mg/5mg per vial) is verified to a minimum purity of 99% per component via independent, lot-specific Janoshik Certificates of Analysis
Luckily, the liver is very resilient , and even if some degree of liver damage is experienced (either from overdoing it with Tylenol or from something else), the liver usually starts to recover within a couple days of stopping the drug and is fully back to normal within several weeks or months
Mol Immunol 25(12):13471354 Carrington DM, Earl HS, Sullivan TJ (1987) Studies of human IgE to a sulfonamide determinant
(PubMed) Safety depends heavily on product purity, sterile technique, dosing, and supervision by licensed medical professionals