MTHFR variants change the genetic code. In some people, this causes the enzyme this gene produces to be less effective and allows homocysteine to build up in the blood. Homocysteine levels are more likely to rise when someone has two copies of the C677T variant. Most people with MTHFR variants have normal homocysteine levels.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.