I think a lot of people really like the Quest Protein powder. Personally I order mine on Amazon and its called Vital Proteins Collagen Peptides. Overall just read the nutrition label and look for protein powder that is low in ingredients and has less than 120 calories per serving and at least 20 grams of protein. Also try to keep the carbs under 4 grams this usually means less added sugars are in that particular powder. I don’t have a clear cut recommendation though for store-bought brands.