Multiplicity of garlic health effects and Alzheimer's disease.

The epidemiological, clinical and laboratory data have shown that garlic contains many biologically active compounds which are beneficial to human health in general. Among all, one garlic-preparation called aged garlic extract, is proven to be safer. Although additional studies are warranted in humans, compelling evidence supports the health effects attributed to aged garlic extract and its implications in preventing or reducing the risk of cardiovascular ailments, stroke and cancer. Recently, the beneficial effects of garlic and its constituents on neuronal physiology and brain functions are beginning to emerge. However, this field is still in infancy and not yet fully explored. This review encompasses multiple health effects of garlic and its constituents with reference to neuroprotection. Possible potential of dietary garlic as an alternative herbal pharmacotherapy for Alzheimer's disease is discussed.