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The recommended intake of vitamin D for older adults aged 65 and above is 800 International Units (IU) per day. This recommendation is based on evidence suggesting that higher levels of vitamin D are necessary to support bone health and prevent deficiencies in this age group, as they are at greater risk for osteoporosis and fractures.

Vitamin D plays a crucial role in calcium absorption and bone metabolism, both of which are vital for maintaining skeletal health as we age. Older adults may have decreased skin synthesis of vitamin D due to less exposure to sunlight, which further necessitates the need for adequate dietary intake or supplementation to reach the recommended levels. The recommendation of 800 IU is aimed at ensuring sufficient levels to support overall health and reduce the risk of falls and related injuries among older adults.