Vitamin B supplements are available as single or multivitamin tablets. These diets may require multivitamin supplements to meet ordinary nutritional needs. In these cases, a multivitamin supplement or liquid nutritional supplement may be needed. Folic acid is a multivitamin that has been found to reduce birth defects. Besides a multivitamin, she only took medication for high blood pressure. There is no standardized scientific definition for multivitamin. Measured by sales, it is Australia's top multivitamin brand. She was the official spokesperson for Pfizer's (legacy Wyeth) multivitamin product Centrum Ultra.