Ask the ExpertsSubscriber OnlyVitamins & Supplements Q. I see the term B vitamins a lot. Why is this plural, when other vitamins, like vitamin C, are not? Published: May 6, 2019 Updated: February 6, 2020 0 Facebook Twitter Google+ Pinterest WhatsApp I see the term B vitamins a lot. Why is this plural, when other vitamins, like vitamin C, are not? To continue reading this article you must be a paid subscriber Subscribe Subscribe to Tufts Health & Nutrition Get the next year of Tufts Health & Nutrition for as little as $18. And access all of our back issues and online content free of charge. Subscribe today and save 36% off the regular rate! Already Subscribed? Click Here to Sign In | Forgot your password?