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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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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 »

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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 »

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The standard dose of vitamin B-12 depends on the age and circumstance of the person and varies between 1 and 25 micrograms per day, reports WebMD. Much higher doses have been used in scientific studies on vitamin B-12 de... More »

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The recommended dietary amount of vitamin B-12 for people age 14 and up is 2.4 micrograms per day, according to Mayo Clinic. Pregnant women require 2.6 micrograms of vitamin B-12 daily, while breast-feeding mothers need ... More »

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For adults, the recommended dietary allowance for vitamin A is 900 micrograms per day for males and 700 micrograms per day for females, says MedlinePlus. Doses vary between 300 to 600 micrograms per day for infants and c... More »

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The recommended dose for a vitamin B-12 shot is 0.4 micrograms for infants up to 6 months and 0.5 micrograms for infants aged 7 to 12 months, explains the National Institute of Health. The dose for children aged 1 to 3 y... More »

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