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There seem to be multiple accounts out there of people correlating thinner hair to excessive caffeine consumption and many times pinpoint coffee consumption. Is it reasonable to believe that coffee and sodas can indeed induce a level of vasoconstriction in certain areas of the scalp (hair line/temples/top of scalp) to a degree large enough to affect hair loss? I have also heard that caffeine has negative effects on cortisol levels. If caffeine has the ability to negatively affect multiple areas that could then at least affect hair growth, would it be wise to stay away from caffeine? For coffee/soda drinkers should they ad vasodilators to the regime in order to improve blood flow such as ginkgo, ginger, etc. Any one have experience with this?