Controlled or sustained release involves encasing active ingredients in a small protective capsule of polymeric material, which releases the ingredients slowly or gradually in optimal concentration over a period of time.

Controlled or sustained release is an important technique in personal care because it regulates the delivery of active ingredients, boosts efficacy, and improves skin health. This technique is utilized in various skin care applications. Unlike conventional formulations, which provide all active ingredients at once, a controlled release system consistently delivers all active ingredients at the optimal concentration and rate, resulting in a long-term effect. This controlled-release formulation allows for the long-term preservation of properties while also increasing product efficacy.

Personal care and nutraceutical products contain a variety of active ingredients, including herbs or extracts, essential oils, vitamins, minerals, and actives. However, some people with sensitive skin have difficulties; on the other hand, they become unstable in different environments. Controlling the release of all of these ingredients can reduce sensitivity and increase longevity through improved bioavailability of active ingredients. The controlled or sustained release technique involves enclosing active ingredients in a protective layer. This releases the ingredients gradually at optimal concentration and time instead of all at once.