When it comes to skin care products, it is important to know the ingredients or materials used, as well as their positive and negative effects. Here are some key takeaways from the search results:

• Ingredients: Skin care products contain a variety of ingredients, such as alpha-hydroxy acids, beta hydroxy acids, and hydroquinone, which can affect wrinkles, fine lines, and other skin conditions. Other popular ingredients include vitamin C, silicone, and copper peptide. It is important to have a basic knowledge of the ingredients in your skin care products so that you can choose products that will work for your skin type.

• Positive effects: Good quality skin care products can help improve the appearance and texture of your skin, protect it from the effects of the sun and pollutants, and increase the amount of collagen in your skin. Active ingredients in skin care products can address various skin concerns and issues such as dry or oily skin, eczema-prone skin, or reduce the appearance of fine lines and wrinkles.

• Negative effects: Some ingredients in skin care products can cause negative effects such as clogging pores, increasing redness, and causing breakouts. It is important to be aware of any potential negative effects of the ingredients in your skin care products.

In summary, understanding the ingredients and materials used in skin care products, as well as their positive and negative effects, can help you choose products that work for your skin type and address your specific skin concerns.