Raspberry Leaf Tea

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Is anyone thinking of using this? 
Someone at work mentioned it to me as a great way to tone the uterus so that the pushing part of labour is quicker with less tearing. She said all 4 of hers were out within 10 mins of pushing after she used this. 
Obviously this is all just from a randomer at work so I have no idea how true it is. 
I've never heard of it before so was wondering if anyone had used it or is planning to?