Does Whey Protein Have Any Harmful Side Effects Whey protein, by itself doesn’t have any harmful side effects. It is a natural protein coming from milk during cheese-making and fermentation process. Whey protein and casein are the two proteins occurring in milk. Whey protein is easier to digest than casein and is faster. There are many products in the market today. These products are flavoured and unflavoured. Some of the most popular ones are MB Whey Protein, ON Gold Standard Whey Protein, Oziva Whey Protein, NutraBay Whey Protein, and MyProtein Whey Protein. How to Avoid Protein Powder Side Effects? Fake Products: They contain fillers, steroids, sugar, hormones, etc. They are not healthy and can cause side effects. Always buy from authentic dealers and check the seal or hologram. You can also check the site for the barcode. Allergies: Lactose intolerant people need to be careful while taking whey protein as it is made from milk. Some products contain soy, and those allergic to it should not have it. Ingredients: Check for additives in the product. Some brands add chemicals like artificial sweeteners, colors, flavours, emulsifiers, thickeners, preservatives, etc. that are not good for health. Avoid high additive products. Milk Shakes: Having a protein powder with milk can lead to side effects like stomach ache, bloating, heaviness, loss of hunger, etc. It can also make you put on weight since milk contains fats.