DEAR DR. ROACH: I see supplements advertised on television that are supposed to clear “brain fog” and do many other beneficial things. Are these any good, and can they actually do the things that they claim to? If they are effective, why aren’t they sold at drugstores? If not, how is it that companies are allowed to make these false claims and advertise these supplements on television?

— J.L.P.

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Dr. Roach regrets that he is unable to answer individual letters, but will incorporate them in the column whenever possible. Readers may email questions to ToYourGoodHealth@med.cornell.edu or send mail to 628 Virginia Dr., Orlando, FL 32803.

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