Vitamin B12: Essential for everyone.

6 min. read

02/07/2026

ENERGY & VITALITY . JOURNAL

Vitamin B12:
essential for vegans, vital for everyone.

For vegan or vegetarian diets, B12 isn't just another supplement. It's THE supplement not to forget — to avoid serious consequences for energy, nerves, and cardiovascular health.

— WHAT YOU NEED TO KNOW

B12: the only vitamin absent
from 100% plant-based diets

Vitamin B12 (cobalamin) is produced exclusively by microorganisms (bacteria, archaea). It accumulates in animal tissues—meats, fish, eggs, dairy products. Plants contain virtually none, and what some algae (spirulina, nori) appear to contain are inactive analogs that have no useful metabolic effect—and can even mask a deficiency.

This means that for a strict vegetarian or vegan diet, B12 supplementation is not optional. It is a physiological necessity. Health organizations worldwide—WHO, ANSES, Academy of Nutrition and Dietetics—unambiguously confirm this: any diet excluding animal products must be systematically supplemented with B12, for life.

Its role in the body is fundamental: it participates in energy metabolism (ATP production in mitochondria via methionine synthase and methylmalonyl-CoA mutase), in the synthesis of neurotransmitters (dopamine, serotonin), in the formation of myelin (protective sheath of nerves), and in the regulation of homocysteine—a marker of cardiovascular and cerebrovascular risk.

Fig. 1 - Tissue activity profile of the 3 forms of cobalamin after sublingual administration

SCIENTIFIC REFERENCE

Vitamin B12 in vegetarian diets: current evidence and practical recommendations

Pawlak R., Parrott S.J., Raj S., Cullum-Dugan D., Lucus D.

Nutrition Reviews . 2013. Vol. 71(2) . pp. 110-117

Access publication -> https://doi.org/10.1111/nure.12001

This seminal clinical review establishes that 92% of unsupplemented vegans have a B12 deficiency, compared to 47% of lacto-ovo-vegetarians. Even among those who consume dairy products and eggs, half remain insufficient—because the bioavailability of B12 in these foods is low and consumption is often inadequate. The conclusion is clear: everyone on a vegetarian or vegan diet must supplement with B12, regardless of the duration of their diet or the subjective impression of being healthy.

“In a vegan diet, B12 is not a comfort supplement. It is a nutritional element that the body demands and that food cannot provide.”

— WHY A DEFICIT DEVELOPS SILENTLY

The body draws on its reserves —
until exhaustion

The specific danger of B12 deficiency is its slow onset. The body stores B12 in the liver, and these reserves can cover 2 to 5 years of needs—sometimes more. A recently converted vegan may therefore experience no symptoms for years, while their reserves are gradually depleted.

When symptoms appear, the deficiency is often already profound: persistent fatigue without apparent cause, tingling in the hands and feet, brain fog, memory loss, mood disorders, megaloblastic anemia. In severe cases, irreversible neurological damage can occur—including degeneration of the posterior columns of the spinal cord.

The other pitfall: dietary B12 is absorbed via a complex mechanism dependent on intrinsic factor, a gastric protein whose secretion decreases with age and certain medications. Nearly 50% of people over 50 poorly absorb B12 even when they consume it—and the sublingual spray form completely bypasses this problem.

POPULATIONS MOST AFFECTED BY B12 DEFICIENCY

Vegans and Vegetarians	92% of unsupplemented vegans have a deficiency. Risk is present from the first months, but symptoms are delayed by 2 to 5 years depending on initial reserves. Lifelong supplementation is essential.
Over 50 years old	Decrease in intrinsic factor secretion with age. Dietary B12 is increasingly poorly absorbed even with an omnivorous diet. Sublingual spray bypasses this problem.
Patients on metformin or PPIs	Metformin (type 2 diabetes) and proton pump inhibitors (omeprazole, pantoprazole) reduce B12 absorption by 20 to 50% according to studies. Supplementation is recommended.
Pregnant or breastfeeding vegan women	B12 requirements increase during pregnancy and lactation. Maternal deficiency directly impacts infant neurological development. Supplementation is crucial.
Athletes and people under heavy strain	Intense physical and cognitive stress increases B12 metabolic needs (mitochondrial energy production, cell renewal). Supplementation supports recovery.

— WHY A DEFICIT DEVELOPS SILENTLY

The body draws on its reserves —
until exhaustion

The specific danger of B12 deficiency is its slow onset. The body stores B12 in the liver, and these reserves can cover 2 to 5 years of needs—sometimes more. A recently converted vegan may therefore experience no symptoms for years, while their reserves are gradually depleted.

When symptoms appear, the deficiency is often already profound: persistent fatigue without apparent cause, tingling in the hands and feet, brain fog, memory loss, mood disorders, megaloblastic anemia. In severe cases, irreversible neurological damage can occur—including degeneration of the posterior columns of the spinal cord.

The other pitfall: dietary B12 is absorbed via a complex mechanism dependent on intrinsic factor, a gastric protein whose secretion decreases with age and certain medications. Nearly 50% of people over 50 poorly absorb B12 even when they consume it—and the sublingual spray form completely bypasses this problem.

POPULATIONS MOST AFFECTED BY B12 DEFICIENCY

Vegans and Vegetarians	92% of unsupplemented vegans have a deficiency. Risk is present from the first months, but symptoms are delayed by 2 to 5 years depending on initial reserves. Lifelong supplementation is essential.
Over 50 years old	Decrease in intrinsic factor secretion with age. Dietary B12 is increasingly poorly absorbed even with an omnivorous diet. Sublingual spray bypasses this problem.
Patients on metformin or PPIs	Metformin (type 2 diabetes) and proton pump inhibitors (omeprazole, pantoprazole) reduce B12 absorption by 20 to 50% according to studies. Supplementation is recommended.
Pregnant or breastfeeding vegan women	B12 requirements increase during pregnancy and lactation. Maternal deficiency directly impacts infant neurological development. Supplementation is crucial.
Athletes and people under heavy strain	Intense physical and cognitive stress increases B12 metabolic needs (mitochondrial energy production, cell renewal). Supplementation supports recovery.

92%

OF UN-SUPPLEMENTED VEGANS ARE DEFICIENT

2 to 5 years

BEFORE SYMPTOMS APPEAR

980 µg

PER DOSE — 39,280% NRV IN 4 SPRAYS

— THE BIOLOGYST FORMULATION

B12 Cell Boost:
three forms, maximum absorption

B12 CELL BOOST was formulated to address the three challenges of B12 supplementation: absorption, cell activation, and duration of action. The solution is a three-form sublingual spray — three cobalamins with complementary profiles, absorbed directly under the tongue, bypassing the gastric barrier and without relying on intrinsic factor.

This is particularly important for vegans: unlike capsules or tablets, the sublingual spray ensures complete absorption regardless of the state of the digestive lining — a decisive advantage for all those with reduced intestinal absorption.

THE 3 FORMS OF COBALAMIN — WHAT THEY DO

Methylcobalamin	Directly active form, cofactor of methionine synthase. Involved in the methylation cycle (homocysteine regulation), neurotransmitter synthesis, and myelin maintenance. Rapid neurological and cognitive action. Tissue peak at 1 hour.
Hydroxycobalamin	Depot form with high tissue affinity. Gradually released over 16 to 24 hours. Converts to methyl- and adenosylcobalamin as needed. Restores and maintains hepatic reserves — essential for individuals with chronic deficiency.
Cyanocobalamin	Standard form, very stable, converted into active forms according to metabolic needs. Ensures a regular and predictable basic supply. In synergy with the other two forms for complete coverage: immediate absorption + storage + prolonged activation.

The formula is certified 100% vegan — with no animal-derived ingredients. The Yuzu flavor makes it pleasant and easy to remember to take. A 20 ml bottle contains 133 sprays, which is more than a month's supply at full dose.

— HOW TO DOSE

4 sprays under the tongue —
that's all

The sublingual spray is the simplest format for B12 supplementation: no tablets to swallow, no dose calculation, no glass of water. Only one rule to remember: 4 sprays in the morning, under the tongue.

HOW TO DOSE B12 CELL BOOST — IN 4 SIMPLE STEPS

1

MORNING

Upon waking, on an empty stomach

Before breakfast or with if forgotten

2

SPRAY

4 sprays under the tongue

Hold for 10-15 seconds before swallowing

3

RHYTHM

Once a day

At noon if forgotten in the morning, can be split if needed

4

TREATMENT

1 to 2 months, renewable

Effects felt from the 2nd-3rd week

FREQUENTLY ASKED QUESTIONS ABOUT DOSING

Why 980 µg — is that a lot?	No, this is normal. Sublingual absorption of B12 is partial: approximately 1 to 3% of the dose is directly absorbed by the mucous membrane. The rest, once swallowed, is absorbed via the digestive system with less efficiency. A high dose ensures sufficient effective intake even in cases of individual absorption variability.
Can you take too much B12?	Vitamin B12 is water-soluble: excess is eliminated in the urine. No toxicity has been described with high oral doses, even long-term. 39,280% of the NRV does not pose a risk — the NRV (2.4 µg/day) is a physiological minimum, not a ceiling.
What if I forget in the morning?	Take your 4 sprays whenever you remember – at lunchtime or even in the afternoon. Daily regularity is more important than the precise time. If you forget for an entire day, simply continue the next day with the normal dose, without doubling.
How long does the treatment last?	For vegan or vegetarian diets, supplementation is permanent—not cyclical. A 1 to 2-month course is suitable for non-vegans supplementing to correct a temporary deficiency. Vegans simply order a new bottle when the previous one is finished.
Can it be combined with other supplements?	Yes, with no known contraindications. B12 Cell Boost is particularly complementary with Magnesium Active+ (coenzyme for many B12-dependent reactions) and with B vitamin complexes (B6, folates) to optimize the methylation cycle.

“4 sprays under the tongue in the morning. That's all it takes to never run out of B12 again.”

— IS IT FOR YOU?

What you can expect
from the first few weeks

The effects of B12 supplementation vary depending on the initial deficiency level. Those with a marked deficiency often experience a significant improvement in energy and mental clarity from the 2nd or 3rd week. Those who supplement preventively (without proven deficiency) maintain their reserves and protect their neurological health in the long term.

EXPECTED BENEFITS BY PROFILE

Vegans and Vegetarians	Prevention and correction of deficiency. Maintenance of mitochondrial energy, neurotransmitter synthesis, and myelin integrity. Cardiovascular protection via homocysteine regulation. Result: stable vitality, alert brain, protected nerves.
Chronic Fatigue	B12 is a direct cofactor in ATP production (mitochondrial Krebs cycle). In cases of deficiency, supplementation can significantly reduce physical fatigue and mental asthenia within the first few weeks.
Brain Fog and Concentration	Methylcobalamin supports the synthesis of dopamine and serotonin, and conditions nerve transmission via myelin. An improvement in concentration and clarity is often reported even before the end of the first month.
Over 50 Years Old	Sublingual B12 bypasses the age-related reduction in gastric absorption. It protects neurological function (prevention of cognitive decline) and contributes to the normalization of homocysteine — a risk factor for cardiovascular disease and Alzheimer's.
Elevated Homocysteine	B12 is a direct cofactor in the remethylation of homocysteine to methionine. Effective B12 supplementation (combined with folate and B6) contributes to the normalization of this marker within a few weeks.

Precautions

Food supplement not a substitute for a varied and balanced diet. In case of pregnancy, breastfeeding, or medical treatment, consult a healthcare professional. Contains potassium sorbate and sodium benzoate (preservatives). Keep out of reach of children.

Discover B12 Cell Boost -> biologyst.com