2 months but i found i wasnt paying to much attention either to the subtle differences, you might want to as an idea stop using them for a week and note differences. Also what products have you been using what ratios etc. You could try using different combos of products or different amounts. Id if you have the stuff in youre possession anyway and forked out the cash just use them till you run out you should get a few more months just to give youreself more time to get use to them, and if it doesnt work well then i would like to know why ive got friends of mine using them and they all report good results male and female. But as some have said they dont work for all depending on whether you want youre money back i guess you could return them for a refund depending on how much youve used. Youre call good luck anyhows.
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