Has Anyone Tried Viva Products?

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Hi, One of my mother's friends gifted my mum this drink and another product from this company: They have two products it seems - I-Coffee & I-Pulse. She's been having it for the last few days with good results. She is having good results and it seems she's stopped most of her medications after this ... now she is adamant I try this and join :P She's not a member, but wants me to join cuz the products are good! It is a natural product ... but I hear mixed reviews about their membership - some say that buying products for a set amount is compulsory every month. Can someone shed some light on this if they're members? Like I mentioned earlier, I am not that good with people, so not looking at this as an income opportunity, rather just for personal use. What's the set amount that's compulsory for purchase every month? Thanks for your inputs :). Regards