Toxicological trivia from March 01, 2010: Extracts of ginkgo tree leaves have antioxidant and anti-inflammatory effects. The ginkgo dietary supplement promoted as a stimulus for memory, does not help prevent dementia and Alzheimer’s disease, according to the most comprehensive and lengthy  study conducted among 98 men and 132 women aged:
a) 40 years old;
b) 50 years old;
c) 60 years old.

Correct answer c. Read more in the Spanish news: A study on ginkgo and dementia or read the original JAMA article in English: Ginkgo for Memory Enhancement. A Randomized Controlled Trial