Vitamin B12 Hydroxocobalamin Drops

Each drop of this liquid provides 98 mcg of hydroxocobalamin, which is 3920% of the nutrient reference value. Take 1 drop per day in water with food, as the label directs. One drop is one serving, and a 100ml bottle holds 1351 servings. Vitamin B12 in a supplement is already in free form, so it does not need the stomach acid step that releases the vitamin from food.

Sources: NIH Office of Dietary Supplements; product label.

Hydroxocobalamin, often shortened to hydroxy B12, is the form of vitamin B12 the body stores and converts into the active forms as needed. 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. Hydroxocobalamin is the form found in food and made by bacteria, and NHS pharmacists note that it is retained in the body for longer than cyanocobalamin.

Sources: NIH Office of Dietary Supplements; NHS.

Hydroxocobalamin drops suit anyone who would rather let the body direct the conversion of B12 into its active forms. Methylcobalamin and adenosylcobalamin are the two active forms, and hydroxocobalamin is converted into whichever of them an enzyme needs. Cyanocobalamin is the more common form in tablets and fortified foods because it is stable and inexpensive. NIH finds no evidence that absorption differs between the forms in supplements; what is documented is retention, and hydroxocobalamin stays in the body for longer. For an active form taken directly, see the methylcobalamin liquid or the adenosylcobalamin liquid; for all three forms in one bottle, see Tri-B12. 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; NHS.

Hydroxocobalamin drops are for people who want a hydroxocobalamin supplement, vitamin B12 in its stored form, taken by mouth. That includes vegetarians and vegans, who get little of the vitamin from diet, anyone building B12 stores steadily rather than quickly, and people who prefer hydroxocobalamin to methylcobalamin. 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.

Building B12 stores with hydroxocobalamin is gradual. 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 drop every day matters more than the time of day. Anyone being monitored should keep to the retest date a GP has set.

Sources: NIH Office of Dietary Supplements; NHS.

A liquid B12 lets the amount be adjusted one drop at a time, and it suits anyone who cannot swallow tablets. Tablets need binders and a coating to hold their shape; this liquid contains only hydroxocobalamin and purified water. NIH finds the same result whether the vitamin is swallowed or dissolved under the tongue, so the drop can go in water or straight on the tongue.

Sources: NIH Office of Dietary Supplements; product label.

Hydroxocobalamin 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.

Hydroxocobalamin 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.