Bone health is one of the most neglected long-term health priorities, receiving attention typically only after a fracture reveals the underlying problem. The time to invest in bone health is the decades before problems develop, through the nutritional, physical, and lifestyle approaches that build and preserve bone density across the lifespan. Vitamin D and calcium are the two nutrients most directly associated with bone health, and understanding their roles, requirements, and appropriate supplementation provides a practical starting point for a bone health strategy.
At mctina.org you will find bone health guides, vitamin D and calcium resources, and practical nutrition information covering the nutrients essential for skeletal health, how to assess your status, and the lifestyle approaches that support strong bones throughout life.
Why Bone Health Matters More Than Most People Realise
Osteoporosis is a condition of reduced bone density that significantly increases the risk of fracture. It affects a substantial proportion of older adults, with postmenopausal women at particularly high risk due to the bone loss that accompanies declining oestrogen levels. Hip fractures in particular carry serious consequences for older adults, with significant mortality and major reductions in independence and quality of life.
The trajectory of bone density follows a predictable pattern: bone is built through childhood and adolescence, reaches peak density in the late twenties, and then gradually declines from the early thirties onward. The higher the peak bone density achieved and the slower the subsequent rate of loss, the lower the lifetime risk of osteoporosis-related fracture. Both of these outcomes are significantly influenced by nutrition and physical activity.
Calcium: How Much and From Where
Calcium is the primary mineral component of bone and is required continuously throughout life, not only during growth. The recommended daily intake varies by age and life stage: most adults require approximately 700 to 1,000mg daily, with higher requirements during pregnancy, breastfeeding, and for postmenopausal women not taking hormone replacement therapy.
Dietary calcium from dairy products, fortified plant milks, canned fish with bones, and leafy green vegetables is better absorbed and utilised than most supplemental forms. For people who cannot meet calcium requirements through diet, supplementation with calcium citrate (which is better absorbed than calcium carbonate and can be taken without food) at doses that bridge the gap between dietary intake and recommended levels is appropriate.
Vitamin D: The Calcium Absorption Partner
Vitamin D is essential for calcium absorption from the intestine: without adequate vitamin D, only a fraction of dietary calcium is absorbed regardless of intake. This close functional relationship means that addressing calcium without ensuring adequate vitamin D status is only partially effective.
Vitamin D deficiency is remarkably common in many populations, particularly in northern latitudes, among people who spend little time outdoors, and among darker-skinned individuals in less sunny climates (where skin pigmentation reduces the efficiency of vitamin D synthesis). Blood testing for vitamin D status (serum 25-hydroxyvitamin D) is the most reliable way to assess whether supplementation is needed and at what dose.
Weight-Bearing Exercise for Bone Strength
Physical activity is as important as nutrition for bone health, and its effects are complementary rather than overlapping. Weight-bearing exercise (any activity in which the skeleton bears the body’s weight against gravity) stimulates bone formation by creating mechanical stress on the bones. Walking, running, dancing, hiking, and resistance training all provide this stimulus; swimming and cycling, while excellent cardiovascular activities, provide minimal bone-building stimulus because the skeleton is not weight-loaded.
Resistance training is particularly valuable for bone health in older adults, providing both bone-loading stimulus and the muscle strength and balance that reduce fall risk, the proximate cause of most osteoporosis-related fractures.
Understanding Supplements for Bone Health Beyond Calcium and Vitamin D
Several other nutrients play supporting roles in bone health. Vitamin K2 (specifically the MK-7 form) supports the activity of proteins involved in incorporating calcium into bone matrix and has emerging evidence for improved bone density outcomes when taken alongside vitamin D. Magnesium is required for both vitamin D activation and calcium metabolism. Vitamin C supports collagen synthesis, which forms the protein matrix of bone.
A bone health supplement that combines these nutrients in appropriate forms and doses offers a more complete approach to nutritional support for skeletal health than calcium alone.