One A Day® Advanced Series Multivitamin with Probiotics. New! Multivitamin/probiotic supplement. The only† complete multivitamin that includes probiotics. Probiotics help support digestive health and immune health by supporting the 70% of your immune system found in the digestive tract*. Bayer. One A Day® advanced series multivitamins, from the nutritional experts at One A Day, is an advanced line of complete multivitamins that provide nutritional support with the latest combinations of specific ingredients to support your health and wellness.* One A Day® advanced series multivitamin with probiotics is the first and only multivitamin that includes probiotics to help support digestive health and immune health by supporting the 70% of the immune system found in the digestive tract.* Multivitamin probiotics. †Among leading brands. Questions or comments Please call 1-800-800-4793. (Mon-Fri 9AM - 5PM EST). Bayer, the Bayer Cross and One A Day are registered trademarks of Bayer. ©2016 Bayer.