Both liquid and tablet forms of B12 supplements are reliable options, however liquid B12 has a slight advantage due to its sublingual form.
Clinical studies have found that the same amount of B12 given orally or under the tongue are equally effective at correcting B-12 deficiency.
Vitamin B-12 is an essential vitamin that plays an important role in red blood cell formation, cell metabolism, nerve function and the production of DNA.
It is generally considered safe when taken at appropriate doses, but high doses can cause side effects.
Liquid vitamin B12 supplements are synthetically made by combining the element cobalt with other compounds, like derivatives of cyanide and methane. They are used to treat anemia, boost energy levels, and reduce blood pressure. However, they can cause side effects such as nausea, vomiting, and diarrhea, and should be taken in the morning or in the evening.
Liquid Vitamin B12: Dosage, Benefits, and More - Healthline
Vitamin B-12 is an essential vitamin that plays an important role in red blood cell formation, cell metabolism, nerve function and the production of DNA. It is not common in the U.S., but people who follow a vegetarian or vegan diet, older adults and people with digestive tract conditions that affect absorption of nutrients, and those with certain medications may benefit from the use of vitamin B-12 supplements. When taken at appropriate doses, vitamin B-12 supplements are generally considered safe, but high doses can cause headache, nausea, vomiting, diarrhea, fatigue or weakness, and tingling sensation in hands and feet.
Vitamin B-12 - Mayo Clinic