Never take Aspirin or alcohol they enhance bleeding and should be avoided if blood flow is not desired. This finishes what i learned. now if you want more information here is the website::::::: http:www.iron-rose.com/IR/docs/needlePlay.htm
Remember safety comes 1st and foremost. Also get to know your Master 1st never try anything without complete trust.
I hope this cleared up any questions
laura ann (midnite)