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</html><thumbnail_url>https://supplementdatabase.com/articles/wp-content/uploads/2020/07/proteinpowder.jpg</thumbnail_url><thumbnail_width>1200</thumbnail_width><thumbnail_height>800</thumbnail_height><description>Casein is commonly referred to as the slow or nighttime protein because of its relatively slow digestion time compared to other options. It's perhaps the second most popular protein after the king: whey. If whey protein is the most popular, is casein good for anything?</description></oembed>
