Milk protein, primarily in the forms of casein and whey, is scientifically validated to support the skeletal system, particularly in the maintenance of bone health. Milk is a rich source of both high-quality protein and essential nutrients like calcium, phosphorus, and vitamin D, which are fundamental for bone formation and maintenance. Several studies have shown that adequate protein intake is necessary for optimal bone mass development, especially during periods of rapid growth such as childhood, adolescence, and in older adults to prevent age-related bone loss.

Clinical research indicates that dairy proteins can stimulate the production of insulin-like growth factor 1 (IGF-1), a hormone that promotes bone growth and remodeling. Furthermore, milk protein supplementation has been associated with increased bone mineral density in older populations and may help reduce the risk of osteoporosis when combined with sufficient calcium and physical activity. For example, a 2017 review in the journal Osteoporosis International highlighted that higher protein intake from dairy sources, including milk protein, supports bone health when calcium intake is adequate.

However, while the benefit is well supported, it is important to note that protein alone, without adequate mineral intake, does not guarantee improved bone health. The synergy between milk protein and other nutrients in milk likely accounts for the positive effect on the skeletal system.