Methylation & Homocysteine Balance

Written by Dr. Ryan Kneessi, ND

The mechanisms this protocol supports

In one-carbon metabolism, the body passes methyl groups from folate and B12 to homocysteine, recycling it into methionine. A second pathway uses trimethylglycine, also called betaine, to do the same job, and the MTHFR enzyme that activates folate depends on riboflavin.

Methylation also controls which genes are switched on and off, and changes in DNA methylation patterns are one of the ways researchers measure biological aging. B12 status often drops with age and with long-term use of metformin or acid-blocking medications.

Research has linked higher homocysteine levels with blood vessel and brain aging, and trials have linked TMG with lower homocysteine levels. Trials have also linked riboflavin with lower homocysteine and lower blood pressure in people with two copies of a common MTHFR gene variant.

What is in the protocol

The exact products and directions are listed in the Fullscript plan, and here is what each one is commonly used to support.

A methylation B-complex provides active folate, B12 and B6, which help recycle homocysteine into methionine, and TMG from Life Extension provides trimethylglycine, which supports a second pathway for recycling homocysteine.

Riboflavin 5′-phosphate provides the active form of vitamin B2, the cofactor the MTHFR enzyme relies on. A methyl B12 supplement provides methylcobalamin, an active form of B12 that supports methylation and homocysteine metabolism.

You can browse these nutrients in my practitioner-grade catalog.

Related protocols you may find helpful include Brain Health & Cognitive Aging and Heart & Lipid Balance.

How to use it thoughtfully

Please talk with your provider before starting, especially if you take medications, are pregnant or nursing, or have a health condition. This page does not list amounts, so follow the label or the specific guidance your provider gives you. When you can, add one product at a time so it is easier to notice how you feel. Sleep, nourishing food, daily movement and stress care are the foundation, and supplements are meant to build on them.

Methyl donors can feel overstimulating for some people, so it helps to start slowly. If you have a history of bipolar disorder, please use methylated B vitamins only with your provider’s guidance. TMG can raise LDL cholesterol in some people, so it is worth rechecking lipids if you use it long term. Riboflavin naturally turns urine bright yellow, which is harmless.

What the research shows

Riboflavin (vitamin B2) is the helper for the MTHFR enzyme. In a 2006 randomized trial by McNulty and colleagues, 89 healthy adults with known MTHFR genotypes took 1.6 mg of riboflavin a day or a placebo for 12 weeks. Homocysteine fell by up to 22% only in people with two copies of the 677TT variant, from 16.1 to 12.5 µmol/L, and by about 40% in those who started low in riboflavin. People with other genotypes did not respond. The groups were small, and the results may differ in countries where foods are fortified with riboflavin.

A 2010 follow-up trial by Horigan and colleagues gave the same dose for 16 weeks to 181 people with early heart disease. In those with the TT genotype, average blood pressure dropped from 144/87 to 131/80 mm Hg, with no change in other genotypes. The authors noted the results need to be confirmed.

Trimethylglycine (TMG, also called betaine) uses a second pathway. A 2013 meta-analysis by McRae of five randomized trials in healthy adults found that at least 4 grams a day for 6 to 24 weeks lowered homocysteine by about 1.23 µmol/L. That is a modest change, and the trials were small and used doses higher than many supplements provide.

Frequently asked questions

Sources

• de Jager J, et al. Long term treatment with metformin in patients with type 2 diabetes and risk of vitamin B-12 deficiency: randomised placebo controlled trial. BMJ 2010. PMID: 20488910. https://pmc.ncbi.nlm.nih.gov/articles/PMC2874129/
• Lam JR, et al. Proton pump inhibitor and histamine 2 receptor antagonist use and vitamin B12 deficiency. JAMA 2013. PMID: 24327038. https://pubmed.ncbi.nlm.nih.gov/24327038/
• McRae MP. Betaine supplementation decreases plasma homocysteine in healthy adult participants: a meta-analysis. J Chiropr Med 2013. PMID: 23997720. https://pmc.ncbi.nlm.nih.gov/articles/PMC3610948/
• McNulty H, et al. Riboflavin lowers homocysteine in individuals homozygous for the MTHFR 677C→T polymorphism. Circulation 2006. PMID: 16380544. https://pubmed.ncbi.nlm.nih.gov/16380544/
• Horigan G, et al. Riboflavin lowers blood pressure in cardiovascular disease patients homozygous for the 677C→T polymorphism in MTHFR. J Hypertens 2010. PMID: 19952781. https://pubmed.ncbi.nlm.nih.gov/19952781/

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