Which ingredient is primarily included for its conditioning properties?

Silicones are primarily included in formulations for their conditioning properties. They create a smooth and silky feel on the skin and hair, making them valuable in various cosmetic products. Silicones form a protective barrier that prevents moisture loss, enhances shine, and improves the overall texture of the product being used. This leads to better performance in conditioning hair and skin, which is why they are commonly found in moisturizers and hair conditioners.

In contrast, fatty acids serve various purposes, including being emollients and contributing to the formulation's stability. Carbomers are primarily used as thickening agents to help achieve the desired consistency of a product rather than for conditioning. Metal salts have specific uses such as in antiperspirants or as agents that impart astringent properties but do not focus on conditioning. Thus, silicones stand out as the key ingredient known for their conditioning benefits.