Methylcobalamin (Active B12)
Most B12 supplements use cyanocobalamin, a cheap synthetic form that contains a cyanide molecule your body must remove before any conversion happens. Methylcobalamin is different: it is the bioactive coenzyme form of B12 your cells use directly, with zero conversion required. Every METHL product that delivers B12 uses methylcobalamin. Never cyanocobalamin.
Shop methylcobalamin B12 supplements
3 productsMETHL makes the only daily B12 supplement line that leads with methylcobalamin, the active coenzyme form your nerves and brain use directly. No cyanocobalamin, no synthetic folic acid, no conversion required. Whether you start with the Liquid B-Complex Drops, the Methylated Multivitamin, or the Bundle, you are getting the B12 form that actually absorbs.
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Liquid B-Complex Drops
Fast-absorbing methylcobalamin B12 plus the full active B-complex and TMG in a clean glycerin base. No conversion step. Just drops a day for steady energy, mood and nerve support.
Multivitamin + B-Complex Bundle
The complete system: the daily multivitamin and the liquid methylcobalamin B-complex together for full-spectrum coverage, at the best price.
Methylated Multivitamin
Your everyday baseline, 19 active vitamins and minerals plus fermented organic greens in one daily capsule. Methylcobalamin B12 included, built for MTHFR, absorbable for everyone.
Methylcobalamin vs cyanocobalamin.
| What matters | Cyanocobalamin | Methylcobalamin (METHL) |
|---|---|---|
| Bioavailable form | ✕ Precursor only | ✓ Active coenzyme |
| Conversion required | Yes, multi-step | None |
| Contains cyanide molecule | Yes (must be removed) | Never |
| Crosses blood-brain barrier | Poorly | ✓ Efficiently |
| Retained in tissue longer | ✕ | ✓ |
| Supports nerve myelin health | Limited | ✓ Directly |
| MTHFR-compatible | Conversion limited | ✓ Always active |
“Methylcobalamin is the neurologically active form of B12. Unlike cyanocobalamin, it requires no hepatic conversion and is retained in tissue longer, making it the clinically preferred choice for nerve health and cognitive support.”
People who finally feel it.
“Absolutely the best vitamins I have ever taken. These vitamins are absolutely the best.”
“My doctor gave me a list of recommended vitamins for my neuropathy. Your product was recommended because it provides more of the vitamins than other products. Makes my daily routine easier.”
“Well tolerated!”
“I optimized everything and still felt off. Twenty years chasing performance, triathlete, marathon runner, martial artist, and I still couldn’t feel the difference. A genetic test explained why: an MTHFR variant meant my body couldn’t use standard vitamins. So I built the one that didn’t exist on the shelf.”
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Active coenzyme form
Methylcobalamin is the form your cells use directly for nerve health, DNA synthesis and homocysteine regulation, no conversion bottleneck.
Built for every body
Whether or not you carry an MTHFR variant, methylcobalamin absorbs and works. No cyanide detox step, no conversion required, ready immediately.
Clean & third-party tested
Made in the USA, vegan certified, no fillers. Every batch tested for purity and potency before it ships.
Methylcobalamin vs cyanocobalamin, explained.
What is methylcobalamin? Vitamin B12 exists in several forms. Two are biologically active: adenosylcobalamin, which works inside mitochondria, and methylcobalamin, which donates methyl groups and supports homocysteine regulation, nerve myelin production and DNA synthesis. Methylcobalamin is the form circulating in human blood and stored in tissue longest, making it the most physiologically relevant form for supplementation.
Why cyanocobalamin is inferior. Cyanocobalamin is a synthetic compound created in the lab. It is not found in nature at meaningful levels and contains a cyanide molecule the body must first remove before any conversion to a usable form can happen. This adds a multi-step metabolic burden. Methylcobalamin requires no such conversion, no detox step, and crosses the blood-brain barrier more efficiently, making it the clinically preferred form for supporting nerve health and cognitive function.
Who needs methylcobalamin most. Everyone benefits from the active form, but it is especially important for: people with MTHFR gene variants, whose conversion capacity is limited; vegans and vegetarians, who get no dietary B12; adults over 50, because intrinsic factor production declines with age and B12 absorption drops; and anyone experiencing fatigue, brain fog, tingling extremities or mood changes, which are common signs of B12 that is not absorbing efficiently.
Which METHL product delivers methylcobalamin. The Liquid B-Complex Drops are the star: methylcobalamin plus the full active B-complex and TMG in a fast-absorbing glycerin base, just drops a day for energy, mood and nerve support. The Bundle pairs it with the Methylated Multivitamin for full-spectrum methylation coverage at the best price. Every formula is made in the USA, third-party tested, vegan and non-GMO, with no synthetic fillers, and backed by a 60-day money-back guarantee.
The problem isn’t you. It’s the form of B12 you’re taking.
Most B12 supplements are built on cyanocobalamin, a synthetic precursor your body has to convert before it can use any of it. If that conversion is limited, you can take B12 every day and still run low. Here is what that feels like, and what METHL does differently.
Your B12 supplement uses cyanocobalamin
The majority of B12 products sold today rely on the cheap synthetic form. Your body must remove the cyanide molecule and run a multi-step conversion before any usable B12 reaches your cells.
You take B12 daily but still feel low energy and brain fog
If you carry an MTHFR variant or are over 50, your ability to convert cyanocobalamin into an active form is reduced. Taking more of the wrong form does not solve a conversion problem.
You are vegan or vegetarian and concerned about B12 absorption
Plant foods contain no B12. Vegans and vegetarians depend entirely on supplements, so the form matters enormously. A synthetic precursor that requires conversion is the last thing you want as your only source.
The methylcobalamin FAQ.
What is methylcobalamin? +
Methylcobalamin is the active, body-ready coenzyme form of vitamin B12. Unlike cyanocobalamin, the synthetic version found in most B12 supplements, methylcobalamin needs no conversion step. Your cells use it directly for nerve health, DNA synthesis and energy production. It is the form naturally circulating in human blood and retained in tissue longest.
Methylcobalamin vs cyanocobalamin: what is the difference? +
Cyanocobalamin is a cheap, shelf-stable synthetic form that contains a cyanide molecule the body must remove before converting it to an active form. Methylcobalamin is already in its active form: no conversion, no cyanide detox step, retained in tissue longer, and better at crossing the blood-brain barrier for nerve and cognitive support. Most mainstream B12 supplements use cyanocobalamin because it is cheaper to produce. METHL uses methylcobalamin because it actually works.
Is methylcobalamin better for B12 than cyanocobalamin? +
For most people, yes. Methylcobalamin is the form your body keeps in tissue longest and the one your nervous system uses. People with MTHFR variants have limited conversion ability, so they benefit most from skipping straight to the active form. Vegans, vegetarians and adults over 50 (whose absorption declines as intrinsic factor production drops) also see meaningful benefit from methylcobalamin over cyanocobalamin.
Who needs methylcobalamin? +
Anyone who wants their B12 supplement to actually work. It is especially important for: people with MTHFR gene variants (limited conversion ability); vegans and vegetarians (no dietary B12); adults over 50 (intrinsic factor declines with age); and anyone experiencing fatigue, brain fog or tingling extremities, which are common signs of B12 that is not absorbing efficiently.
How does the METHL Liquid B-Complex deliver methylcobalamin? +
The Liquid B-Complex is a fast-absorbing formula in a clean vegetable-glycerin base. Take 2 full droppers (2 mL) daily, straight or mixed into water. You can hold it under the tongue for a few seconds to maximize sublingual absorption. No conversion required: methylcobalamin is ready the moment it reaches your cells.
Does the METHL Multivitamin contain methylcobalamin? +
Yes. Both the Methylated Multivitamin and the Liquid B-Complex use methylcobalamin, never cyanocobalamin. The Multivitamin also includes 5-MTHF folate and P5P (active B6), covering all three key methylated B vitamins in one daily capsule.
Can I take the Liquid B-Complex and the Multivitamin together? +
Yes. They are designed to work together, which is exactly what the Bundle is. The Multivitamin provides your daily foundation of 19 active vitamins and minerals plus fermented organic greens, while the Liquid B-Complex delivers a concentrated, fast-absorbing dose of active B vitamins for energy, mood and methylation support.
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