I just want to say that I've had a similar experience. After about 2 weeks taking 200mg/day single-dose Resveratrol I developed very severe nosebleeds. This has happened to me twice, with about one year between the events. (I doubted that the Resveratrol was the cause the first time, so I tried taking it again. I now have no doubts.)
In my case the nosebleeds have been very severe, and I lost about 8 ounces of blood or more with each bleed. Very frightening... Probably some peculiar interaction with my metabolism, but should certainly appear someplace as a possible side-effect.
Similar experience. I weigh 157lbs am in good health and have not had a nosebleed in decades. I have been taking a resveratrol supplement, between 60 - 180 mg most days for about a week and have awoken two mornings to heavy nosebleeding. Hard to make a certain determination as to the cause since the resveratrol supplement I have been taking is an herbal complex containing several other extracts (acai, milk thistle, grape seed, etc.) in significant amounts.
However, the effect is unpleasant enough that I will not be continuing the regime at anything near the recommended dosage of 240mg resveratrol per day and may stop altogether.
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