From the Research
Collagen supplements do not directly increase serum calcium levels, and therefore, do not lead to hypercalcemia. Calcium and collagen serve different functions - calcium is a mineral essential for bone strength, while collagen is a protein that provides structure to bones, skin, and connective tissues. If you're concerned about calcium levels, it's better to take calcium supplements (typically 1000-1200mg daily for adults) or consume calcium-rich foods like dairy products, leafy greens, and fortified foods. Vitamin D (600-800 IU daily for most adults) is also important as it helps with calcium absorption 1. While collagen supplements may support bone health by improving bone matrix structure and potentially reducing bone breakdown, they don't contain significant amounts of calcium. For optimal bone health, a balanced approach including adequate calcium, vitamin D, and protein intake along with weight-bearing exercise is recommended.
Some studies have investigated the effects of collagen peptides on bone health, and they suggest that collagen peptides may have a positive effect on bone mineral density and bone turnover markers when combined with calcium and vitamin D supplementation 2, 1. However, these studies do not suggest that collagen supplements increase serum calcium levels. In fact, a study published in 2022 found that supplementation with calcium, vitamin D, and collagen peptides for 12 months improved trabecular and cortical bone parameters, but did not increase serum calcium levels 1.
It's also worth noting that some studies have investigated the relationship between nutritional habits and hair calcium levels, and they suggest that hair calcium levels are weakly related to dietary calcium intake and may be influenced by other factors such as vitamin D and magnesium intake 3. However, these studies do not provide evidence that collagen supplements increase serum calcium levels.
In summary, collagen supplements are not a significant source of calcium and do not directly increase serum calcium levels. If you have concerns about low calcium levels, consult with a healthcare provider for proper testing and personalized recommendations. A balanced approach to bone health, including adequate calcium, vitamin D, and protein intake, along with weight-bearing exercise, is recommended for optimal bone health 4, 2, 1.