Cognitive functions are brain skills divided into: memory, perception, language, executive functions, attention and praxis (ability to perform complex movements). These functions depend on healthy synapses and neurons, which require good overall brain functioning. Supplements can affect cognitive function directly or indirectly. Direct effects can alter or participate in neurotransmissions and influence the brain’s energy metabolism. The indirect effects include hormonal changes that affect the brain, and improvements in cognitive disorders such as anxiety, depression and insomnia.