When sourcing Vitamin C Candy, the most critical factor is the active ingredient stability. You must ensure the Vitamin C (Ascorbic Acid) content matches the label claim throughout the shelf life. Look for products using micro-encapsulation technology to prevent oxidation. Additionally, verify the sugar content or sweetener type (e.g., Xylitol or Stevia for sugar-free versions) and ensure the gelatin source (Bovine, Porcine, or Pectin for vegans) aligns with your target market's dietary preferences.