Methylation Cycle

Key takeaways:

• The methylation cycle is a core biochemical process that affects DNA synthesis and repair, neurotransmitter production, detoxification, epigenetic gene expression, and energy metabolism.
• Common variants in genes like MTHFR, MTR, MTRR, BHMT, CBS, and COMT can change how efficiently you recycle folate, B12, and other methyl donors, influencing homocysteine and related health risks.
• Blood markers such as homocysteine can reflect methylation status and are often more informative than any single SNP in isolation.
• Vitamins and cofactors—including folate, B12, B2 (riboflavin), B6, choline, and creatine—play key roles in keeping the methylation cycle running smoothly.

This page is a hub for all Genetic Lifehacks articles and member tools related to the methylation cycle, organized to help you learn step‑by‑step.

Start here if you’re new:

1. MTHFR basics and folate conversion
2. Homocysteine overview
3. COMT and supplements
4. Vitamin B12: MTR & MTRR
5. B2/Riboflavin cofactor
6. Folate intake basics

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Members’ tools for methylation:

Methylation Cycle Topic Summary
Prioritize which articles apply to your genotypes by using the summary report. Click through from the report to the articles that will be most impactful for your genes.

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Core methylation pathway & folate cycle

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Vitamins, cofactors, and related nutrients

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Homocysteine and key methylation genes

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 Conditions linked to methylation variants

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Latest articles about the methylation cycle:

• MTHFR Gene Explained: C677T and A1298C Variants, Testing, and Solutions
• FOLR1 and FOLR2: Transporting Folate, Folinic Acid, and Folic Acid into Cells
• DHFR and MTHFR: Folic Acid Metabolism
• Vitamin B12, MTR & MTRR, and Methylation
• Folate Intake: How Much Is Too Much for Optimal Health?
• AHCY Gene: Tying together methylation and homocysteine
• Homocysteine: Genetics, High Homocysteine Levels, and Solutions
• MTHFD1: Folate and Choline
• Creatine: Boosting Muscles and Increasing Brain Power
• COMT: How to Optimize Your Supplements for Your COMT Genotype
• Riboflavin (Vitamin B2), MTHFR, and Deficiency Symptoms
• Folate Optimization: MTHFR and Fertility
• CBS Gene Variants and Low Sulfur Diet
• MTHFR: Going Beyond C677T and A1298C
• MTHFR, Depression, Anxiety, Symptoms and Treatment
• Vaccines and the MTHFR mutation
• BHMT: Genetic Variants that Impact Methylation
• MTHFR and Migraines
• Histamine Intolerance, MTHFR, and the Methylation Cycle
• COMT Gene: Neurotransmitter Levels, Estrogen Metabolism, and SNPs
• MTR and MTRR Genes: Methylation cycle and the need for Vitamin B12
• Methylation Cycle Topic Summary
• Riboflavin (Vitamin B2): MTHFR and FMO3 SNPs