People can take B12 supplements in the form of oral tablets, sublingual tablets that dissolve under the tongue, or injections. A doctor can provide advice on the correct dosage of this vitamin.

These include: While there's no upper limit to how much vitamin B12 you can take, there are general dosage recommendations. For example, the Vegetarian Nutrition Dietetic Practice Group recommends ...

No Tolerable Upper Intake Level (UL) has been established for B12, due to its low level of toxicity. UL refers to the maximum daily dose of a vitamin that is unlikely to cause adverse side effects ...

Depending on the individual, they start working within 48 to 72 hours of the first dose, but they might take three months to completely correct a B12 deficiency. Important: Vitamin B12 is water ...

One such vitamin is vitamin B12. Vitamin B12 is stored in the liver and plays a major role in cognitive functioning, amongst other things. The way to know if you have a B12 deficiency is by taking ...

This may help reduce the burning associated with dry eye. There isn’t a recommended vitamin B12 dosage for dry eye symptoms. How much you should take depends on your ability to absorb the vitamin.