Pro bodybuilders almost never drink protein shakes. They get protein from eating food. Not shakes. If they are recommending a protein shake or supplement, it’s because they are getting paid to do so.
Protein shakes and other supplements is an industry trying to sell you something.
Most don’t work out hard enough to need a protein shake. The protein will turn to fat.
"Dietary proteins are first broken down to individual amino acids by various enzymes and hydrochloric acid present in the gastrointestinal tract. These amino acids are absorbed into the bloodstream to be transported to the liver and onward to the rest of the body. Absorbed amino acids are typically used to create functional proteins, but may also be used to create energy. They can also be converted into glucose. This glucose can then be converted to triglycerides and stored in fat cells."
Protein shakes and other supplements is an industry trying to sell you something.
Most don’t work out hard enough to need a protein shake. The protein will turn to fat.