Written by Josh Gitalis, a sweet, sweet member of Meghan Telpner’s Superhero Posse. He is our Superhero Therapeutic And Evidence Based Nutritionist. Read Josh’s bio here. One of the most popular supplements on the market is the multi-vitamin Centrum. What many people don’t realize is that this multi-vitamin is probably doing more harm than good. A Few Centrum Facts: Centrum is a product produced by the company Pfizer, one of the largest pharmaceutical companies in the world.