AnonymousHidden identity

My uncle and aunt are following the Tayyibat system

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I am currently following the Tayyibat system from the beginning and I see people saying it’s beneficial and people saying it’s harmful, and I used to say that surely one side is lying. Until my uncle and aunt started following the Tayyiban system together; my uncle’s health deteriorated badly and my aunt’s health became much better to the point that someone looking at her would say she looks 20 years younger. So I don’t understand what I should do and who I should follow?