Methyl B12

Methyl B12 is available on the market in several pharmaceutical forms designed to ensure optimal absorption and easy administration—sublingual tablets, capsules, or oral spray.

Sublingual tablets dissolve quickly under the tongue, ensuring direct absorption into the bloodstream without passing through the gastrointestinal tract. Examples of sublingual methylcobalamin – methylcobalamin tablets from KAL Methylcobalamin 5000 mcg, Jamieson B12 2500 mcg, or Solgar Methylcobalamin 1000 mcg.

There is also injectable methylcobalamin (used in medical practice, but not in everyday supplementation) – used in the treatment of severe vitamin B12 deficiency.

Methylcobalamin vitamin is recommended in multiple clinical and physiological situations:

• Vitamin B12 deficiency – commonly found in vegetarians, vegans, the elderly, or patients with digestive disorders (atrophic gastritis, Crohn's disease, intestinal resections)
• Nervous system health – contributes to myelin synthesis and maintenance of neuronal function, being useful in peripheral neuropathies, multiple sclerosis, or diabetic neuropathy
• Mental and cognitive support – vitamin B12 plays a role in normal psychological function, reducing anxiety and depressive symptoms
• Red blood cell formation – prevention and correction of megaloblastic anemia
• Energy metabolism – participates in the conversion of carbohydrates, lipids, and proteins into energy
• Homocysteine metabolism – contributes to reducing plasma homocysteine levels, a cardiovascular risk factor

The recommended dosage varies depending on the type of methylcobalamin supplement, indication, and patient characteristics. For example:

• KAL Methylcobalamin 5000 mcg – 1 tablet per day, sublingual or chewed, as recommended by your doctor.
• Jamieson Vitamin B12 2500 mcg – ½ tablet daily, sublingual, with rapid absorption.
• Solgar Methylcobalamin 1000 mcg – 1 tablet per day, preferably with a meal, placed under the tongue or between the cheek and gum.

The administration of Methyl B12 vitamins is generally well tolerated. However, the use of Methyl B12 should be avoided in cases of hypersensitivity to vitamin B12 or to the product's excipients.

Precautions are necessary in patients with severe kidney or liver disease, where medical advice is indicated.

The product is suitable for vegans and vegetarians as it does not contain any ingredients of animal origin.

It does not contain gluten, lactose, soy, or genetically modified organisms (non-GMO).

During pregnancy and breastfeeding, it is recommended to take it only on the advice of a doctor to determine the appropriate dose.

Side effects are rare and generally minor:

• Gastrointestinal disorders (nausea, abdominal cramps, diarrhea)
• Allergic skin reactions (rash, itching)
• Headaches

Long-term administration, even at higher doses, is considered safe due to the water-soluble nature of vitamin B12.

Methyl B12 may interact with:

• Metformin – reduces the absorption of vitamin B12; 
• Proton pump inhibitors (omeprazole, pantoprazole) and antacids – decrease the absorption of vitamin B12 from food.
• Anticonvulsant drugs

There are no significant interactions with food, but sublingual administration bypasses the digestive tract, optimizing bioavailability.

Vitamin B12 has low toxicity, and cases of overdose are very rare. Doses of up to 5000 mcg per day are usually well tolerated. In exceptional cases, adverse reactions such as agitation, insomnia, digestive disorders, and skin rashes may occur.

Treatment consists of discontinuing administration and, if necessary, seeking medical advice.

Methyl B12 should be stored at room temperature (15-30°C), away from moisture and direct light. Keep out of the reach and sight of small children. Preferably consume before the expiry date stated on the packaging. The original packaging must be kept intact to protect the product.

• PubMed, Methylcobalamin: a vitamin with analgesic potential
• Mayo Clinic, Vitamin B12
• NIH, Vitamin B12
• PubMed, Effectiveness of methylcobalamin and cyanocobalamin supplementation in maintaining serum holotranscobalamin levels in a group of adults following a plant-based (vegan) diet