They are often consumed by sportspeople as part of a fitness diet or as a meal replacement (e.g., an instant breakfast).
They have also been targeted towards those who have nutritional deficiencies as well as those working in tech fields.
Health shakes may include a wide range of ingredients, including powdered nutrients, superfoods, bee pollen, peanut butter, coconut oil, bean powder, clover sprouts, whey, etc.
Bodybuilders sometimes drink a protein shake to help muscular recovery and building.
Factory-made products often contain sweeteners and other additives (e.g., antioxidants, preservatives).