What dietary supplement ingredient has been tested for its ability to improve memory in Alzheimer's disease,but has produced only small and unreliable improvements in published research?

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Ginkgo biloba has been tested for its ability to improve memory in Alzheimer's disease, but results have been small and unreliable according to published research. Lobelia is not known to have any effect on memory or Alzheimer's disease. Androstenedione is a banned substance in many sports due to its ability to artificially enhance performance, but it is not known to have any effect on memory or Alzheimer's disease. St. John's wort has been tested for its ability to treat depression, but it is not known to have any significant effect on memory or Alzheimer's disease.

What Dietary Supplement Ingredient Has Been Tested for Its Ability