Vitamin B-12 - Mayo Clinic Know the causes of a vitamin B-12 deficiency and when use of this supplement is recommended
Vitamin D - Mayo Clinic The recommended daily amount of vitamin D is 400 international units (IU) for children up to age 12 months, 600 IU for people ages 1 to 70 years, and 800 IU for people over 70 years
Vitamin C - Mayo Clinic Vitamin C is an essential nutrient found in foods and available as a supplement you take by mouth Learn about its potential benefits and the causes of vitamin C deficiency
Biotin (oral route) - Side effects dosage - Mayo Clinic The daily amount of biotin needed is defined in several different ways For U S — Recommended Dietary Allowances (RDAs) are the amount of vitamins and minerals needed to provide for adequate nutrition in most healthy persons RDAs for a given nutrient may vary depending on a person's age, sex, and physical condition (e g , pregnancy)