if u have had sides with fin i would suggst u use 1% or 2% . i use 6%. if u want to save money i would suggest u order from the group buy 10 grams for 180. the group buy on ******* buys from kane. 10 grams should last well over 6 to 8 months if u apply to the hairline only. also people will be starting cb which might be better then ru! we shall wait and see the results. i apply just a thin layer along the hairline and thats it brotha