Vitamins unlikely to revitalize the mind

There is little proof that taking supplements prevents cognitive decline or dementia.

As people age, they tend to suffer from vitamin deficiencies. The elderly are commonly deficient in vitamin B₁₂, for example, because they produce less stomach acid than younger people, and therefore are not as able to metabolize this vitamin from food sources. Age-related changes also make older adults less efficient at producing vitamin D following sun exposure.