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Individual differences |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
A placebo-controlled double-blind experiment found that vegetarians who took 5 grams of creatine per day for six weeks showed a significant improvement on two separate tests of fluid intelligence, Raven's Progressive Matrices and the backward digit span test from the WAIS. The treatment group was able to repeat back longer sequences of numbers from memory and had higher overall IQ scores than the control group. The researchers concluded that "supplementation with creatine significantly increased intelligence compared with placebo." A subsequent study found that creatine supplements improved cognitive ability in the elderly. A study on young adults (0.03 g/kg/day for six weeks; only 2 g/day for 150 lb individual) failed however to find any improvements.
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