Which of the following is NOT part of the essential information for skin care education?

The essential information for skin care education focuses on foundational knowledge that directly impacts a person's skin health and care routines. Understanding skin types is crucial, as it helps in recommending appropriate products and treatments tailored to individual needs. The meaning of at-home care is also vital; educating clients on how to maintain their skin between professional treatments allows them to achieve better results over time.

Similarly, the effects of environmental factors on skin are important because they can influence skin conditions and overall skin health. Knowledge in this area enables individuals to take proactive measures to protect their skin from potential damage.

In contrast, while popular celebrity products may be trendy and garner attention, they do not provide the fundamental information necessary for effective skin care education. This knowledge is not essential for understanding skin care principles or routines, as the effectiveness of a product often depends more on its formulation and suitability for a person's unique skin type rather than its association with celebrities.