Low Vitamin B12? Diet vs. InjectionsWhat Works Faster? Key Takeaway for MTHFR Patients If you have a known or suspected MTHFR mutation, using Methylcobalamin injections ensures the body receives pre methylated, ready to use B12without relying on compromised conversion pathways. This can Vitamin B12Multifaceted In Vivo Functions and In Vitro Applications B12 and MTHFR: Understanding the Connection and Its Impact on Health IV Wellness