Preservatives are used in emulsions.

• A. Not used
• B. True
• C. Only in certain emulsions
• D. Never used

Answer: (B)

Preservatives are included in emulsions to prevent microbial growth and extend shelf life, because emulsions have an aqueous phase and are often exposed to the environment or repeated handling in multi-dose containers. This microbes-friendly setup can support bacteria, yeasts, or molds if not controlled. The preservative has to be compatible with both oil and water phases and with the emulsifying system, ensuring it doesn’t destabilize the emulsion or affect taste, odor, or safety. While some sterile or single-dose emulsions may be preservative-free, the common practice for non-sterile, multi-dose emulsions is to add a preservative. So the statement is true.