Methylcobalamin Vitamin B12 Capsules

Each capsule provides 1000 mcg of methylcobalamin, which is 40000% of the nutrient reference value. Take 1 capsule per day with food, as the label directs. A pot holds 90 capsules, a 90-day supply. The shell is vegetarian cellulose, and the capsules are vegan and free from gluten, dairy and nuts.

Sources: NIH Office of Dietary Supplements; product label.

Methylcobalamin, often shortened to methyl B12, is one of the two forms of vitamin B12 that the body's enzymes use directly. Vitamin B12 is a family of compounds built around an atom of cobalt, which is why they are called cobalamins; the forms differ only in the small group attached to that cobalt. In methylcobalamin that group is a methyl group, and it is the form the enzyme methionine synthase uses to recycle homocysteine into methionine.

Sources: NIH Office of Dietary Supplements.

Methylcobalamin capsules give a fixed 1000 mcg a day; the liquid gives 86.5 mcg per drop and builds up drop by drop. A capsule suits anyone who wants the full amount in one step, or whose practitioner has set 1000 mcg of methyl B12. The liquid is the gentler start for anyone new to methylcobalamin, since a small number of people find this form stimulating at first. NIH finds no difference in effect between the vitamin swallowed and the vitamin dissolved under the tongue, so neither route absorbs better.

Sources: NIH Office of Dietary Supplements; product label.

Methylcobalamin capsules suit anyone who wants an active form of B12 that needs no conversion. Cyanocobalamin is the most common form in tablets and fortified foods; it is stable and inexpensive, and the body converts it into the active forms. Hydroxocobalamin is the stored form, retained in the body for longer, and is converted as enzymes need it. NIH finds no evidence that absorption differs between the forms in supplements, so the choice is about form rather than how much gets in. For the stored form, see the hydroxocobalamin liquid; for the other active form, see the adenosylcobalamin capsules; for all three forms in one bottle, see Tri-B12.

Sources: NIH Office of Dietary Supplements; NHS.

Methylcobalamin capsules are for people who want the methylation form of B12 at a fixed higher amount. That includes anyone told by a practitioner to take methyl B12, and vegetarians and vegans, who get little of the vitamin from diet. Food Standards Scotland names older adults, people who have had stomach or bowel surgery, and vegans and vegetarians as the groups most likely to run short. Anyone who thinks they may be low in B12 should ask a GP for a blood test rather than self-treating.

Sources: Food Standards Scotland; NIH Office of Dietary Supplements.

Methylcobalamin is most often taken with iron, folate or the other B vitamins, and no interaction with iron is listed by NIH. Pairing methylcobalamin and methylfolate is common in a methylation routine. Folate and vitamin B12 work together on homocysteine. NIH flags one combination to avoid: a high intake of folic acid alongside low vitamin B12 has been associated with poorer mental function in older adults. Mayo Clinic advises leaving two hours or more between a vitamin C supplement and vitamin B12. Prescription drugs are the interactions that matter. Proton pump inhibitors and other acid reducers cut absorption of the vitamin from food, and metformin lowers blood levels, so anyone on regular prescriptions should ask a pharmacist first.

Sources: NIH Office of Dietary Supplements; Mayo Clinic.

Methylcobalamin raises the body's supply of vitamin B12 from the first dose, but the store it tops up is large. The body holds 1 to 5 mg of the vitamin, a thousand times or more the daily requirement, and a shortage takes years to develop. Absorption falls as the dose rises, which is why supplements carry far more than the daily requirement: about 2% of a 500 mcg dose is absorbed. In people who are short of the vitamin, a 2018 review of three trials found high doses by mouth restored blood levels. Anyone who started because of a low result should keep to the retest date a GP has set.

Sources: NIH Office of Dietary Supplements; NHS.

A capsule is a cellulose shell around the powder, so it needs no coating and breaks down quickly once swallowed. Tablets need binders and a coating to hold their shape. These capsules contain methylcobalamin with cellulose as the carrier and nothing else.

Sources: NIH Office of Dietary Supplements; product label.

Methylcobalamin has no reported side effects at the amounts found in food or supplements. The body does not store the excess: what is not used passes out, which is why no safety ceiling has been needed. UK advice puts the level unlikely to cause harm at 2 mg a day from supplements. Observational studies have linked unusually high blood levels to poorer health outcomes, but trials giving supplements for two to seven years found little or no effect on serious illness or death rates. Anyone pregnant or breastfeeding, or taking prescribed tablets, should speak to a GP or pharmacist first.

Sources: NIH Office of Dietary Supplements; Food Standards Scotland.