There are many dieters who are now using resveratrol free trial packs. They must know that it is not advisable for the people who are below 18 years of age. Next, you must check with the doc before using any diet supplements, whether it is resveratrol or any thing. Now, another important thing is to check that the product must not have caffeine. That would not let you have a proper sleep in the nights. Also see that the ingredients of the product must be given in full details along with their ratio. They must be natural with no chemicals at all.