Babies 12 months of age and younger get the vitamin C they need from breast milk, while children ages 1 to 3 need 15 milligrams and children ages 4 to 8 need 25 milligrams, according to Mayo Clinic. Children ages 9 to 13... More »

The correct dosage of vitamin K2 to treat abnormal uterine bleeding and amenorrhea is 2.5 to 10 milligrams per day for five to 10 days, according to The correct dosage to treat constipation is 0.35 milligrams ... More »

The recommended dietary allowance of vitamin B-12 for adults is 2.4 micrograms per day, reports MedlinePlus. Pregnant women should increase their vitamin B-12 intake to 2.6 micrograms per day, and women should increase t... More »

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As of 2015, the recommended dose of vitamin D is 600 international units for adults from ages 18 to 70, according to Mayo Clinic. Individuals over the age of 71 should take 700 international units of vitamin D. More »

The daily dosage for vitamin C varies depending on age, gender and lifestyle choices such as smoking. The National Institutes of Health provide a list of the average daily recommended amount of vitamin C in milligrams, a... More »

The recommended amount of vitamin C in an adult's daily dietary intake is between 65 and 90 milligrams, explains Mayo Clinic. However, up to 2,000 milligrams can be ingested by an average adult and still be considered sa... More »

The correct dosage for vitamin B-12 injections depends on the patient's age and the reason for the injection, states Mayo Clinic. For adults with vitamin B-12 deficiencies, doctors often prescribe 1,000 microgram intramu... More »