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All Vitamins

Explore the complete range of clean, organic methylated vitamins from Only Multivitamin. We proudly carry METHL—our exclusive line of bioavailable, organic, methylated vitamins designed to support energy, immunity, and overall wellness. Every product is made in the USA, free from fillers and unnecessary additives, and crafted for superior absorption and real results. Simple, clean, and focused on what your body actually needs.

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Detox & Antioxidant Supplements

NAC and Antioxidant Supplements for Detoxification

Your liver processes every toxin, medication, hormone, and metabolic waste product in your body. It needs glutathione — your master antioxidant — to do this work. NAC is the most effective way to maintain glutathione levels and support your body's natural detoxification capacity.

The Detox Stack

Glutathione Support

METHL NAC ($36.00) — pharmaceutical-grade N-acetyl-L-cysteine. Provides the rate-limiting amino acid for glutathione production. Supports liver detoxification, respiratory health, and antioxidant defense. Multiple strength options for customized dosing.

Antioxidant Synergy

METHL Vitamin C ($35.00) — pairs with NAC for complete antioxidant coverage. Vitamin C protects outside cells, glutathione protects inside. They regenerate each other for a self-reinforcing defense system.

Methylation Foundation

METHL Methylated Multivitamin ($51.99) — methylated B vitamins support Phase II liver methylation detoxification. Selenium and zinc power additional antioxidant enzymes. The complete nutritional foundation for detox pathways.

Why NAC Is Not Like Other "Detox" Supplements

Most detox products promise vague liver cleanses with unproven herbal blends. NAC is different — it is an FDA-approved medication used in hospitals to treat acute liver failure. Its mechanism is well-understood: it replenishes glutathione, the molecule your liver actually uses to conjugate and eliminate toxins. Five decades of clinical research, not marketing claims.

Who Benefits Most

  • Regular acetaminophen users — NAPQI depletes glutathione
  • Alcohol consumers — ethanol metabolism generates oxidative stress
  • MTHFR carriers — impaired methylation reduces glutathione via transsulfuration pathway
  • People with respiratory issues — NAC thins mucus and protects lung tissue
  • Anyone under high toxic burden — environmental chemicals, medications, processed food

Detox FAQ

When should I take NAC?
Evening or before bed is ideal — supports overnight liver detoxification. Can be taken on empty stomach for best absorption or with food if GI sensitive.

Can I take NAC with alcohol?
Yes. Take NAC before or alongside drinking to support glutathione during alcohol metabolism.

Want the full science? Read our Complete NAC and Detoxification Guide.


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Immune Support Vitamins & Supplements

Methylated Immune Support Vitamins

Your immune system runs on vitamins and minerals in their active forms. METHL provides methylated B vitamins plus an organic immunity blend of turmeric and garlic extract, combined with fermented organic greens — a comprehensive immune foundation designed for daily defense.

The Immune Support Stack

Daily Immune Foundation

METHL Methylated Multivitamin ($51.99) — 5-MTHF, methylcobalamin, zinc, selenium, vitamins A and D, plus organic turmeric and garlic immunity blend. Fermented greens support gut health where 70% of immune function resides. Your daily non-negotiable.

Antioxidant Immune Shield

METHL Vitamin C ($35.00) — enhanced immune cell protection. Immune cells concentrate vitamin C at 100x plasma levels. Essential during cold and flu season and critical during active illness when vitamin C is consumed rapidly.

Glutathione and Respiratory Support

METHL NAC ($36.00) — boosts glutathione (your master intracellular antioxidant), thins respiratory mucus, and has been shown to reduce frequency of influenza-like illness in clinical trials.

Complete Immune Protocol

Multivitamin (daily foundation) + Vitamin C (antioxidant shield) + NAC (glutathione support) = comprehensive immune defense covering innate immunity, adaptive immunity, antioxidant protection, and gut barrier integrity.

Why Methylated Forms Matter for Immunity

During infection, immune cells divide rapidly — demanding folate and B12 for DNA synthesis at rates that exceed normal by orders of magnitude. Standard folic acid must be slowly converted before immune cells can use it. 5-MTHF is immediately available for the DNA synthesis that rapid immune expansion requires. When every hour of immune response matters, the conversion bottleneck is not just inconvenient — it is a liability.

Immune Support FAQ

Can these prevent me from getting sick?
They ensure your immune system has optimal resources. Well-nourished immunity responds faster and more effectively, often reducing illness severity and duration.

When should I start taking immune support?
Year-round. Reactive supplementation after getting sick is far less effective than maintaining optimal immune nutrition daily.

What should I add during illness?
Increase vitamin C, continue all other supplements, rest, and hydrate. Your immune system needs energy and nutrients, not stimulants.

Want the full science? Read our Complete Immune Support Guide.


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Methylated B Complex Vitamins

Methylated B Complex Vitamins — Capsule and Liquid

All eight B vitamins in their pre-activated methylated forms. No conversion required. METHL offers two formats: traditional capsules and liquid liposomal for enhanced absorption. Both provide the exact coenzymes your cells use, bypassing the genetic bottlenecks that limit standard B vitamins.

Choose Your Format

Capsule B Complex

METHL B Complex Capsules ($42.00) — all 8 methylated B vitamins including 5-MTHF and methylcobalamin. Clean formulation, plant-based capsule, no fillers. Best for daily maintenance and people with normal digestion.

Liquid Liposomal B Complex

METHL Liquid Liposomal B Complex ($45.00) — same methylated forms in liposomal delivery for up to 3x absorption. Best for people over 50, those with digestive issues, MTHFR homozygous carriers wanting maximum bioavailability, and anyone who wants precise dose control.

Complete B Vitamin Protocol

Multivitamin + Liquid B Complex Bundle ($90.00) — full-spectrum nutrition plus concentrated methylated B boost. Morning multivitamin + midday liquid B complex for all-day energy and mental clarity.

Methylated vs Standard: Why It Matters

Standard B complex uses folic acid and cyanocobalamin — cheap forms requiring enzymatic conversion. 40%+ of people have MTHFR variants that impair this conversion. Methylated forms (5-MTHF, methylcobalamin, P5P) are the exact coenzymes your cells need. No conversion, no bottleneck, no wasted nutrients.

B Complex FAQ

Capsule or liquid?
Both work. Liquid liposomal absorbs 2-3x better — choose it if you want maximum benefit or have absorption concerns.

Will B vitamins give me energy?
They restore energy production capacity, not stimulate it. Steady, natural energy rather than a caffeine-like spike.

Can I take this with my multivitamin?
Yes. The B complex adds concentrated methylated B vitamins on top of your multivitamin base — ideal for people needing extra support.

Want the full science? Read our Complete B Complex Guide.


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Methylated Vitamins for Energy & Focus

Methylated Vitamins for Natural Energy and Mental Clarity

If you are tired of being tired, standard vitamins probably are not the answer. Your body needs B vitamins in their pre-activated methylated forms to produce energy at full capacity. The products on this page provide exactly that — methylated coenzymes your mitochondria use directly, with no conversion bottlenecks.

Which Energy Product Is Right for You

Everyday Energy Foundation

METHL Methylated Multivitamin ($51.99) — 19 vitamins and minerals in active forms including 5-MTHF, methylcobalamin, and organic immunity blend. Supports energy production at every level: mitochondrial, neurological, and muscular. Take daily with breakfast.

Enhanced Energy and Focus

Liquid Liposomal B Complex ($45.00) — all 8 methylated B vitamins in liposomal delivery for up to 3x higher absorption than capsules. Add this to your multivitamin for enhanced energy support, especially if you have MTHFR variants or severe fatigue.

Maximum Energy Stack

Multivitamin + B Complex Bundle ($90.00) — the complete energy protocol at a bundled price. Morning multivitamin for full-spectrum foundation plus midday liquid B complex for sustained afternoon energy.

How Methylated Vitamins Restore Energy

Standard B vitamins require your body to convert them into active coenzymes before they can support energy production. If you carry MTHFR gene variants — roughly 40 percent of people do — this conversion is impaired by up to 70 percent. Methylated vitamins arrive pre-converted, ready for your mitochondria to use immediately.

The result: more CoQ10 production (electron transport chain efficiency), more creatine (energy buffering for brain, heart, muscles), more carnitine (fat burning in mitochondria), and more neurotransmitter production (mental energy and focus).

What to Expect

  • Week 1-2: Subtle energy improvement, slightly less afternoon crash
  • Week 3-4: Noticeable mental clarity, reduced caffeine need
  • Week 5-8: Sustained energy all day, better exercise tolerance, improved mood

Not a stimulant effect — this is your body's natural energy capacity restored.

Energy Support FAQ

Why am I tired if my blood tests are normal?
Standard tests measure circulating levels, not active coenzyme availability at the cellular level. Methylated vitamins bypass the conversion your tests cannot measure.

Can I take these with coffee?
Yes. Take with food for best absorption. Heavy coffee drinkers may benefit from slightly higher B vitamin intake since caffeine increases urinary B vitamin excretion.

Which product should I start with?
Start with the Methylated Multivitamin. If after 3-4 weeks you want more, add the Liquid B Complex.

Want the full science? Read our Complete Energy and Methylation Guide.


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MTHFR Gene Support Supplements

Finding the Right Methylated Vitamins for MTHFR Support

If you carry an MTHFR gene variant, standard multivitamins with folic acid and cyanocobalamin are working against you. Your body needs pre-methylated forms — 5-MTHF and methylcobalamin — that bypass the enzymatic bottleneck your genetics create. The products on this page were formulated specifically for people with MTHFR variants, using bioavailable ingredients your body can actually absorb and use.

What to Look for in an MTHFR Supplement

Not all "methylated" supplements deliver what MTHFR carriers need. Before buying anything, check these five things on the label:

1. Folate Form: 5-MTHF, Not Folic Acid

The single most important detail on any MTHFR supplement label is the folate source. You need 5-methyltetrahydrofolate calcium (also listed as L-5-MTHF, Metafolin, or Quatrefolic). This is the exact active form your cells use — no MTHFR enzyme conversion required. If a product lists "folic acid" or just "folate" without specifying the form, it is not designed for MTHFR carriers and will not solve your problem.

METHL uses 5-methyltetrahydrofolate calcium (110 mcg) in every formulation. No folic acid anywhere in the line.

2. B12 Form: Methylcobalamin, Not Cyanocobalamin

Cyanocobalamin is the cheapest B12 form and the most common in drug store vitamins. Your body must strip off a cyanide molecule and attach a methyl group before it becomes usable — a conversion that depends on the same methylation pathways your MTHFR variant already impairs. Methylcobalamin is the active form that participates directly in the methylation cycle. It works immediately upon absorption without any conversion.

METHL uses methylcobalamin (18 mcg) as its B12 source. The liquid liposomal B complex provides methylcobalamin in a liposomal delivery system that achieves up to 3x higher blood levels than standard capsules.

3. No Synthetic Fillers or Artificial Ingredients

Many supplement brands cut costs with fillers like magnesium stearate, titanium dioxide, silicon dioxide, and artificial colors. These add nothing nutritionally and may interfere with absorption in sensitive individuals. People with MTHFR variants often have heightened chemical sensitivities due to impaired detoxification, making clean excipients even more important.

METHL contains only rice bran and a hypromellose (plant-based) capsule. No fillers, no binders, no artificial anything.

4. Supporting Nutrients for the Full Methylation Cycle

Methylation does not run on folate and B12 alone. The full cycle requires vitamin B6 (as pyridoxal-5-phosphate) for the transsulfuration pathway, vitamin B2 (riboflavin) as a cofactor for the MTHFR enzyme itself, and zinc and magnesium for hundreds of methylation-adjacent reactions. A good MTHFR supplement provides the complete supporting cast, not just the headline nutrients.

METHL's multivitamin includes all 19 essential vitamins and minerals in their most bioavailable forms, plus an organic immunity blend (turmeric, garlic extract) and organic fermented greens (barley grass, kale, chlorella, alfalfa, spinach).

5. Appropriate Dosing for Your Variant Severity

MTHFR support is not one-size-fits-all. Heterozygous carriers (one copy of C677T or A1298C) may do well with a standard methylated multivitamin alone. Homozygous carriers (two copies of C677T) or compound heterozygous carriers (one C677T + one A1298C) typically benefit from higher doses — a multivitamin base plus a standalone methylated B complex.

MTHFR Supplement Stack: Which Products for Your Situation

If You Are Heterozygous (One Copy of Any Variant)

Enzyme function is reduced by about 35 percent. A single comprehensive methylated multivitamin provides sufficient support for most people in this category. Take daily with food. Monitor how you feel over four to eight weeks — most people notice improved energy, clearer thinking, and better mood within this timeframe.

Recommended: METHL Methylated Multivitamin ($51.99) — your complete daily foundation.

If You Are Homozygous C677T (Two Copies)

Enzyme function is reduced by up to 70 percent. You need higher doses of methylated B vitamins to compensate for the significant enzymatic bottleneck. Start with the multivitamin, then add a standalone B complex after two weeks for enhanced support. Consider adding NAC for glutathione production since your impaired methylation likely affects your antioxidant defenses too.

Recommended:

Best value: Multivitamin + B Complex Bundle ($90.00 — save vs buying separately)

If You Are Compound Heterozygous (One C677T + One A1298C)

This pattern affects the enzyme through two different mechanisms simultaneously. The combined impact can approach homozygous C677T severity. Follow the homozygous recommendations above. The A1298C component specifically impacts BH4 production for neurotransmitter synthesis, so pay particular attention to mood and cognitive symptoms as indicators of whether your supplementation is adequate.

If You Have Not Been Tested

You do not need a genetic test to benefit from methylated vitamins. If you experience chronic fatigue, brain fog, mood issues, or any of the symptoms associated with impaired methylation, switching to a methylated multivitamin is a safe, low-risk step that can confirm the connection through your response. Roughly half the population carries at least one MTHFR variant — the odds favor supplementing with methylated forms regardless.

Start here: METHL Methylated Multivitamin — try it for eight weeks and track your energy, mood, and mental clarity.

How METHL Compares to Other MTHFR Supplements

The methylated supplement market has grown rapidly, but most products fall into one of three categories: cheap multivitamins that swapped folic acid for methylfolate but kept everything else the same, expensive prescription-grade methylfolate (Deplin) that costs $75 to $150 per month and provides only folate without supporting nutrients, or overengineered "methylation protocol" products with 30+ ingredients at sub-therapeutic doses.

METHL takes a different approach: clinical-grade methylated forms of every B vitamin, combined with whole-food organic ingredients, at doses that are therapeutic without being excessive, in a clean formulation free of synthetic fillers. It is comprehensive enough to serve as your primary daily supplement and specific enough to address the core MTHFR issue effectively.

Feature METHL Typical "Methylated" Multi Prescription Methylfolate
Folate form 5-MTHF calcium Often still folic acid L-methylfolate only
B12 form Methylcobalamin Usually cyanocobalamin Not included
Full vitamin spectrum 19 vitamins + minerals Varies Folate only
Organic whole foods Immunity blend + greens Rarely No
Fillers None (rice bran only) Magnesium stearate, etc. Multiple inactive ingredients
Vegan Yes Often gelatin capsules Varies
Monthly cost $51.99 $20-40 $75-150

Starting Your MTHFR Supplement Protocol

Week 1-2: Foundation

Begin with METHL Methylated Multivitamin, one serving daily with breakfast. Some people feel a difference within the first week — a subtle lift in energy or mental clarity. Others take longer. Both responses are normal. If you experience any temporary restlessness or headache, reduce to half a serving for a few days then increase back to full dose. This is your body adjusting to improved methylation capacity.

Week 3-4: Assess and Add

After two weeks on the multivitamin, assess your response. If energy and mood have improved meaningfully, continue as is. If improvements are partial — especially if you are homozygous or compound heterozygous — add Liquid Liposomal B Complex for enhanced methylated B vitamin support.

Week 5-8: Optimize

By week five, most people have found their optimal combination. Consider adding NAC if you want to support glutathione production and detoxification, or Vitamin C for additional immune and antioxidant support. Both work synergistically with methylated B vitamins.

Ongoing

MTHFR is a permanent genetic variant. Methylated vitamin supplementation is a lifelong practice — not a temporary fix. The cost is modest, the risk is essentially zero, and the benefits compound over time. Many people who start methylated vitamins report that they never want to go back to how they felt before.

Common Questions About Buying MTHFR Supplements

How long until I feel a difference?
Most people notice changes in energy and mental clarity within two to four weeks. Mood improvements typically emerge over four to eight weeks. Full methylation optimization takes three to six months.

Can I take these with my current medications?
Methylated vitamins are safe alongside most medications. However, if you take methotrexate, anticonvulsants, or metformin, discuss methylated supplementation with your prescribing doctor as these medications affect folate metabolism.

Is it safe to take during pregnancy?
Methylated folate is preferred over folic acid during pregnancy, especially for MTHFR carriers. METHL provides 5-MTHF which is the form recommended by maternal-fetal medicine specialists for women with MTHFR variants. Always confirm with your OB/GYN.

What if I do not have MTHFR but want better vitamins?
Methylated forms are superior for everyone, not just MTHFR carriers. They bypass slow conversion steps that limit all humans, produce no unmetabolized folic acid, and deliver nutrients in the exact forms your cells use. There is no downside to choosing methylated over standard vitamins.

Do you ship internationally?
Currently shipping within the United States. International shipping is coming soon.

What is your return policy?
See our return policy for details.

Want to understand the science behind MTHFR in depth? Read our Complete MTHFR Guide — 15,000 words covering gene variants, the methylation cycle, symptoms, testing, pregnancy, mental health, detoxification, diet, and more.


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Only Multivitamin's Best Seller Vitamins

Discover our top-rated, best-selling methylated vitamins and supplements, trusted for superior absorption, clean ingredients, and real results.

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Only Multivitamin's Best Seller Vitamins - METHL

Only Multivitamin's Vitamin Bundles

What's better than 1 bottle of amazing vitamins? 2 or 3 bottles that's what. Bundle, save, get healthier. 

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Only Multivitamin's Vitamin Bundles - METHL

Women's Wellness Vitamins

Women's Methylated Vitamins for Every Life Stage

Women's bodies have unique nutritional demands at every stage — menstruation, fertility, pregnancy, postpartum, perimenopause, and beyond. METHL's methylated vitamins are formulated with pre-activated 5-MTHF and methylcobalamin that your body uses immediately, no matter what your MTHFR status. Especially important for the 40% of women carrying gene variants that impair standard vitamin conversion.

For Your Stage

Daily Foundation (All Women)

METHL Methylated Multivitamin ($51.99) — 5-MTHF folate, methylcobalamin B12, organic immunity blend, fermented greens. Supports hormonal balance, energy, immunity, and methylation. Your daily non-negotiable at every life stage.

Trying to Conceive / Prenatal

Methylated multivitamin provides the 5-MTHF critical for neural tube closure (days 21-28 post-conception). Start at least 3 months before trying to conceive. Folic acid is inadequate for MTHFR carriers — methylated folate is the form leading specialists now recommend.

Energy and Mood Support

Liquid Liposomal B Complex ($45.00) — add to your multivitamin for enhanced B vitamin support during high-demand periods: pregnancy, postpartum, perimenopause, or chronic stress. 3x absorption vs capsules.

Immune and Antioxidant

METHL Vitamin C ($35.00) + METHL NAC ($36.00) — complete antioxidant protection. Supports estrogen metabolism, glutathione production, and immune defense throughout hormonal transitions.

Why Methylated Matters More for Women

Women face higher folate demand from menstruation, pregnancy, and hormonal metabolism. MTHFR variants that reduce folate conversion are linked to fertility issues, pregnancy complications, postpartum depression, and hormonal imbalances. Methylated forms bypass the bottleneck — giving you the exact nutrients your body needs at every stage.

Women's FAQ

Safe during pregnancy?
Yes — 5-MTHF is preferred over folic acid by leading maternal-fetal specialists, especially for MTHFR carriers. Confirm with your OB/GYN.

Help with PMS?
B6 reduces PMS mood symptoms (clinically proven). Full methylated B complex supports hormonal balance. Most women notice improvement within 2-3 cycles.

Safe with birth control?
Yes — and especially important since birth control depletes folate and B6.

Want the full science? Read our Complete Women's Wellness Guide.


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