I saw nothing to suggest that, so far. Still have a lot of full texts to get, though.Is there any evidence to suggest that Ashwagandha should be cycled?
Since the mechanism through which it effects neurogenesis isn't well-understood, there's still a possibility that it's something which may be subject to tolerance, or shouldn't be constantly used for another reason.
One of the papers in my post about neurogenesis showed that rats pre-treated with ashwagandha for 30 days enjoyed better neuroprotection than rats treated for only a week or two before injury, or treated after. Not sure if that translates to any of its other effects, but it's something.