In what form would you be buying it?
I buy tamarind (paste, in a jar) on occasion to add to Pad Thai. I'm pretty sure it's fermented, as many fruits and vegetables throughout Asia are. (Fermented is often referred to as sour.) And given that there is evidence that fermented fruits aid in digestion, I can imagine that there could be a slight weight loss in people who needed a boost to digestion of refined and unhealthy diets.
I can't imagine that as a food added to other food, that it would be unsafe or have side effects unless you have an allergy.
I see no point in eating it in high amounts, or highly concentrated.
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