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Take 3 capsules daily, as directed on the packaging. B vitamins are generally well tolerated with or without food, though taking them with a meal may reduce the chance of nausea. Avoid taking late in the evening if you find B vitamins affect your sleep.
Methyl-Guard Plus is a methylated B-vitamin complex from Thorne, formulated to support healthy methylation - the biochemical process underpinning DNA repair, neurotransmitter synthesis, and homocysteine metabolism. It combines active, methylated forms of key B vitamins with betaine (trimethylglycine), a well-studied methyl donor that works alongside the B-vitamin pathway to help keep homocysteine levels in a healthy range.
Elevated homocysteine is a common finding on cardiovascular and metabolic blood panels, and is often linked to poor methylation capacity - sometimes genetic (MTHFR variants), sometimes dietary. This formula is suited to those who have been told they carry a common MTHFR polymorphism, or whose bloods show raised homocysteine, as the methylated forms of folate and B12 bypass the conversion steps that these variants impair. It may also suit those with low B12 or folate status identified through testing, or individuals supporting cardiovascular health as part of a broader clinical plan.
Thorne is a brand our clinical team returns to consistently. Their manufacturing standards are well regarded in the supplement industry, and they typically opt for the bioavailable, coenzymated forms of B vitamins rather than synthetic precursors. For a condition as precisely measurable as homocysteine, choosing a formula built on active ingredients rather than raw vitamins is a meaningful distinction.
Standard UK delivery included on every order, 1 to 3 working days after dispatch.
Next working day for £25 when you order by 12pm. Orders placed before 12pm on a working day leave the same day. Later orders leave the next working day.
You can return unopened and unused items within 30 days of delivery. This does not affect your statutory rights. Read the delivery and returns terms
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Sign inMethylation is a chemical process that happens billions of times per second in the body, involved in DNA repair, gene expression, neurotransmitter production, and detoxification. Poor methylation capacity — often flagged by elevated homocysteine on a blood test — is associated with cardiovascular and neurological health concerns.
Not necessarily. This formula is particularly relevant for people who carry common MTHFR variants, as it provides folate and B12 in pre-converted, active forms that do not require the MTHFR enzyme to work. However, anyone with elevated homocysteine or low B-vitamin status identified on testing may benefit. If you are unsure, a blood panel is the most useful starting point.
Homocysteine is best monitored via blood testing. In clinical practice, meaningful changes in homocysteine levels are typically assessed after 8–12 weeks of consistent supplementation, though this varies by individual and baseline levels.
Combining multiple B-vitamin products can lead to excessive intake of certain vitamins, particularly B6 and B12. Check your full supplement stack and, if in doubt, discuss with a clinician or pharmacist before stacking this with other B-complex or multivitamin products.
Those who are pregnant or breastfeeding, or who are taking medications that interact with folate or B12 (such as methotrexate), should speak to their doctor before use. Check the packaging for a full list of contraindications.
Overall
6 months ago
My GP flagged elevated homocysteine on a routine blood panel last year and suggested looking into methylated B vitamins. Been on this for about three months now and my most recent retest showed a real improvement. I take it in the morning with breakfast. Couldn't be happier with how it's sitting in my stack.
6 months ago
Found out I carry an MTHFR variant a couple of years ago after some persistent fatigue. Tried a few different methylated formulas before landing on this one. The difference with getting the active forms vs the cheap synthetic versions is real — at least for me. Will keep reordering.
6 months ago
My integrative doctor recommended this specifically. She said she consistently goes back to this brand because of how seriously they take their manufacturing. Three months in and my energy levels feel more stable than they have in a while. Hard to attribute it to one thing but this is staying in the routine.
6 months ago
Does what it should — I've been on it for four months and my homocysteine has come down noticeably on my last blood test. My only gripe is the price. £48.99 for a month's supply feels steep when you're taking multiple supplements. Still, I keep buying it because I haven't found anything comparable at a lower price point.
7 months ago
She specifically said to look for methylated forms and betaine together. This ticked all the boxes. Two months in, feeling good, and my follow-up bloods look better. Would recommend to anyone in the same boat.
7 months ago
Been taking this alongside magnesium and omega-3 for about six weeks. Can't say I feel dramatically different day-to-day, but my homocysteine result came down by a meaningful amount on my retest. That's the whole point, so job done.
Biomarker check, £350MaryleboneSee your vitamin D, iron and B12.At our clinic in Marylebone, London, doctors also offer private blood tests and longevity medicine.
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