The best protein for smoothies depends on individual preferences and dietary needs. Whey protein is popular for its fast absorption and creamy texture, making it ideal for smoothies. Plant-based proteins like pea, rice, hemp, and soy are great options for those following vegetarian, vegan, or dairy-free diets. Collagen peptides offer potential benefits for skin and joint health. Ultimately, the best protein for your smoothies will depend on factors such as taste, dietary restrictions, and personal nutritional goals. Experimenting with different protein sources can help you to find the one that suits your needs and adds a nutritional boost to your smoothies.