You might look into Ashwagandha. One of its purported benefits is to calm the mind. I have only just recently started taking it. I have to say it's one of the few natural remedies that I've taken where I can actually feel a direct effect. I'm still not convinced it's beneficial for all of the things people take it for (the list is quite long), but for me the focus, mind-centering benefits are definitely there.
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