Consuming whey protein in normal amounts is generally considered safe and is not known to be harmful to the liver. In fact, whey protein has been shown to have a number of health benefits, including supporting muscle growth and repair, improving immune function, and reducing the risk of certain chronic diseases.
However, it's important to keep in mind that consuming high amounts of protein, regardless of the source, can put a strain on the liver and kidneys, particularly for individuals with pre-existing liver or kidney conditions. Excessive protein intake can also lead to dehydration and electrolyte imbalances.
In general, it's best to follow recommended daily protein intake guidelines and to consume a balanced diet that includes a variety of nutrient-dense foods. It's also important to consult with a healthcare professional or registered dietitian if you have any concerns about your protein intake or if you have a pre-existing liver or kidney condition.