Considering I utilize this plant partially for sleep, no I’ve never experienced anything like that. It’s one of the few things that helps me consistently sleep soundly.

As for the wrinkled fingers, the only sensible mechanism I can think of is dehydration. If you Google this, it’s a verifiable symptom of mild dehydration. Kratom is an extremely hydrophobic plant in powdered form, it only even dissolves properly in water when it’s near boiling. Imagine it sitting in your insides, hence it can cause dehydration.

If you’re ingesting the plant matter, increase your water consumption Significantly imo. I make strained tea and I personally have zero side effects from it, including no amount of dehydration. It remains a bit of a diuretic, but coffee is as well.