When it comes to choosing skin care products, its important to consider the ingredients, both positive and negative, and the materials used in the product. Here are some tips and information from the search results:

• Check the ingredients list: This is the best way to determine if a product is suitable for your skin, regardless of positive reviews or ratings.
• Popular skin care ingredients: Some popular ingredients in skin care products include alpha-hydroxy acids (AHAs), beta hydroxy acids (BHAs), hydroquinone, and vitamin C derivatives.
• Natural skin care ingredients: Natural ingredients can be a healthy addition to any skin care product. Some examples of natural ingredients include aloe vera, chamomile, green tea, and jojoba oil.
• Ingredient percentages: The first five ingredients in a skin care product are usually water or aloe, followed by the next four ingredients included at concentrations of anywhere between 3-5%. After the first five ingredients, you can still find many performance-based active ingredients, along with thickeners, preservatives, fillers, and everything else that makes up a skincare product.
• High-quality ingredients: High-quality ingredients can help improve the amount of collagen, stimulate collagen, and avoid skin disorders. Some examples of good skin care products include those that contain natural ingredients, deep-acting hyaluronic acid, and are suitable for highly sensitive and allergy-prone skin.

In summary, when choosing skin care products, its important to check the ingredients list, consider popular and natural ingredients, and look for high-quality ingredients that are suitable for your skin type.