Bah! I don't buy it.
A company advertises product X by claiming that it substantially improves memory and staves off dementia. The company provides no convincing evidence for these claims, and scientific studies fail to confirm the existence of the stipulated effects. Would you buy X? Probably not. Would the government and consumer protection agencies allow X to be freely marketed without at least a warning to potential gullible customers? Hardly, it seems.
Yet there is a similar product X, which has been sold to tens of thousands of people for decades without a murmur. I am talking here about studying philosophy at a university as a way of improving one’s thinking skills.