![Can I Use Niacinamide With Hyaluronic Acid?](http://protocol-lab.com/cdn/shop/articles/Can_I_Use_Niacinamide_with_Hyaluronic_Acid_{width}x.jpg?v=1721755322)
The definitive answer to whether you should use hyaluronic acid and niacinamide together. Discover how to use niacinamide with hyaluronic acid, whether alone in separate products or mixed together.
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![At What Age Should You Start Using Retinol?](http://protocol-lab.com/cdn/shop/articles/IMG_0550_{width}x.jpg?v=1720546798)
Retinol’s ideal age range depends on a lot of factors, starting with your unique skin concerns. In this post, we’ll help you figure out if you’re at the right age to start using retinol.
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![Does retinol thin the skin? Retinol serum swatch on face](http://protocol-lab.com/cdn/shop/articles/does_retinol_thin_the_skin_018ae6ea-37f9-4bf7-abd5-a5dda5d55b1c_{width}x.jpg?v=1720734227)
Retinol won’t thin your skin - quite the opposite. Find out how retinol thickens the lower layers of the epidermis while smoothing out skin texture and erasing imperfections.
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![Texture closeup of cream with niacianmide vs vitamin C serum](http://protocol-lab.com/cdn/shop/articles/3336698963104780035_11868071837_{width}x.jpg?v=1720717064)
If you’re seeking brighter, healthier skin, you should know the difference between niacinamide vs vitamin C. In this guide, we explain the key differences, including benefits, gentleness, and more.
![Glycolic Acid vs Salicylic Acid](http://protocol-lab.com/cdn/shop/articles/Exfoliation_101_AHAs_vs._BHAs_vs._PHAs_{width}x.jpg?v=1719342066)
If you want to get rid of dead skin, you’ll probably need to choose between glycolic acid vs salicylic acid. In this post, we’ll help you figure out which will be the best option for you!