A: Jami Cooley – “Over the counter (OTC) multivitamins are fine; however, you want to be sure and read the labels for the dosage of the nutrients as well as added ingredients. Centrum, for example, contains Calcium Carbonate, the least absorbable form of Calcium. There are also other additives such as corn starch and dyes/ food coloring so it may be more beneficial to select a better quality OTC multivitamin with less additives.” Learn more about this, and other related topics in the course “A Clinician’s Guide to Improving Therapeutic Outcomes: Why is Nutrition Important?”.