A nutritional supplement composition enhances cognitive function and includes huperzine A, vinpocetine, acetyl-L-carnitine, and rhodiola. The composition is formulated for oral administration. The huperzine A, vinpocetine, acetyl-L-carnitine, and rhodiola are in a ratio a:b:c:d: respectively such that a as the huperzine A is between about 0.8 and 1.2, b as vinpocetine is between about 80 and 120, c as rhodiola is about 1,600 and 2,400, and d as the acetyl-L-carnitine is between about 8,000 and 12,000.