Since we all have different immune systems and skin types, it is important which ingredients are most suitable for your skin. Many famous cosmetic brand products around the world may feel safe, but in fact no product fits 100% equally well on all skin types. It is the smartest skin care to check and use only the product that fits your skin type. Conversely, there are ingredients that are harmful to all skin. For example, ingredients such as paraben,artificial color, artificial flavor, alcohol have been used as a preservative for raw materials in times when skin care was not well developed.Therefore, products that contain a lot of preservatives have to have a long expiration date, and even if a small amount is added, it is inevitable to accumulate quickly on our skin, which is applied to cosmetics in the morning and evening for 1 day, 365 days, and decades. Therefore, if you really care for your skin, you need to find a product that helps you have healthy skin by using it constantly. The first step is all the ingredients of the product, not the brand or design. Most of the products used in expensive spas are already famous around the world, but when you check the ingredients, it is often surprising. Although it is advertised as a cosmetic made with a long tradition, they applied same old way to the product which uses harmful paraben as a main ingredient. So, it is better to use mild products and remember to avoid using ingredients that are not suitable for you.