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How to use collagen serum? Collagen serums can be an essential part of your skin care routine to maintain the youthful and firm appearance of your skin. As OIA, we offer you this step-by-step guide to take the best care of your skin. By using collagen serum correctly, you can get maximum benefit and preserve the vitality of your skin.

Before You Start Using Collagen Serum

1. Analyze Your Skin Type

Kolajen serum kullanmaya başlamadan önce cilt tipinizi ve cildinizin ihtiyaçlarını değerlendirmek...