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Genetics glossary

What is Homocysteine?

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Homocysteine: definition

Homocysteine is an amino acid produced during methylation; it's recycled using folate, B12 and betaine or converted with vitamin B6, and elevated levels are associated with cardiovascular and cognitive concerns.

Homocysteine, explained

Blood homocysteine is a practical functional marker of the methylation cycle. Levels can be influenced by folate, B12 and B6 status, MTHFR variants, kidney function, medications, alcohol and smoking.

Why it matters

It shows how your methylation cycle is working in real life — more informative than genotype alone.

Learn more

Genetics · GuideMethylation: What It Is, Why It Matters and How to Support ItWhat is methylation? A plain-English guide to the methylation cycle, the nutrients that power it (folate, B12, B6, choline), related genes like MTHFR and COMT, and how to support it.Genetics · GuideMTHFR: What the Gene Does, Common Variants and What Results MeanWhat is MTHFR? Learn what the gene does, how common the C677T and A1298C variants are, what results do and don't mean, folic acid vs. methylfolate, and smart next steps.Genetics · ComparisonGenetic Testing vs. Blood Testing: What's the Difference and Do You Need Both?Genetic tests show lifelong tendencies; blood tests show your current status. Compare what each measures, how often to test, and why they work best together.

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FAQ

Homocysteine FAQs

What is Homocysteine?

Homocysteine is an amino acid produced during methylation; it's recycled using folate, B12 and betaine or converted with vitamin B6, and elevated levels are associated with cardiovascular and cognitive concerns.

Why does Homocysteine matter?

It shows how your methylation cycle is working in real life — more informative than genotype alone.

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