Tri-B12 Drops

Tri-B12 is one liquid that supplies vitamin B12 as three of its forms together: methylcobalamin, adenosylcobalamin and hydroxocobalamin. 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. Methylcobalamin and adenosylcobalamin are the two forms the body's enzymes use directly, and hydroxocobalamin is the stored form the body converts into either of them as needed. Cyanocobalamin, the manufactured form in most standard supplements, is left out.

Sources: NIH Office of Dietary Supplements; product label.

A serving of Tri-B12 is 10 drops, providing 300 mcg of vitamin B12, which is 12000% of the nutrient reference value. That is 100 mcg each of adenosylcobalamin, methylcobalamin and hydroxocobalamin. Take 10 drops daily in water with food, as the label directs. A 100ml bottle holds around 166 servings, and the liquid is also available in 250ml and 500ml.

Sources: NIH Office of Dietary Supplements; product label.

Tri-B12 covers each job vitamin B12 does without relying on one conversion route. Methylcobalamin works in the cell fluid with the enzyme that recycles homocysteine, adenosylcobalamin works inside the mitochondria with the enzyme that processes certain fats and amino acids, and hydroxocobalamin is retained in the body for longer and topped up into whichever active form is needed. NIH finds no evidence that absorption differs between the forms in supplements, and no trial has shown a combination of forms to outperform a single form in people whose conversion is normal, so the case for three forms is coverage, not extra absorption.

Sources: NIH Office of Dietary Supplements; NHS.

Tri-B12 suits anyone who has been told to take B12 but not which form. It also suits anyone who would rather not choose between the forms. Each single-form liquid gives more of one form per drop: the methylcobalamin liquid for the methylation form, the adenosylcobalamin liquid for the mitochondrial form, and the hydroxocobalamin liquid for the stored form. Anyone who already knows the form they want will get more of it from the single-form liquid. All five liquids, with the dose per drop of each, are listed together on the vitamin B12 drops page.

Sources: NIH Office of Dietary Supplements; product label.

Tri-B12 drops are for people who want the two active forms and the stored form of B12 in one bottle. That includes vegetarians and vegans, who get little of the vitamin from diet, and anyone who prefers a liquid they can hold under the tongue. 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.

Tri-B12 is most often taken with folate, iron or the other B vitamins, and no interaction with iron is listed by NIH. 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.

Tri-B12 raises the body's supply of vitamin B12 from the first serving, 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: about half of a dose within 1 to 2 mcg is absorbed, but only about 2% of a 500 mcg dose. Taking the drops every day matters more than the time of day, and NIH finds the same result whether these vitamin B12 drops are swallowed or held under the tongue. As a liquid B12, Tri-B12 can also be added to water. 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.

Tri-B12 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.