VITAMIN C is a well known and well documented vitamin in nutritional science. Its importance has been recorded in more than 3,000 separate studies. Range of 21ST Century’s VITAMIN C Preparations: – CHEWABLE ORANGE FLAVORED TABLETS Available in 250mg, 500mg and 1000mg natural orange flavored chewable tablets. – PROLONGED RELEASE Prolonged-Release VITAMIN C in 500mg and 1000mg to ensure 12 hours of availability in the body. Supplement with Vitamin B Complex.