Vitamins to improve memorizing of variations in chess Has anyone tried vitamins for improving memory? How about Memo Plus Gold, has anyone tried it?

Do you think it will improve memorizing theories and variations?
There is no credible evidence that supplements benefit cognitive functioning in people who don't have clinical disorders.  The only people making those claims are people trying to sell you something.  As mentioned above, the only indicated rationale for such treatment is with a nutritional disorder, or some other type of clinical problem.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3311304/

"Dietary supplements are one of the most common forms of complementary and alternative medicine that patients use and although limited, evidence for their potential interactions with other treatments has been documented. Considering the insufficient evidence for their efficacy, potential for interaction with other therapies and costs to patients, physicians should be aware of the use of dietary supplements among their patients so that they can advise their patients on the potential benefits and harms."