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Because the FDA does not regulate supplements, many health authorities are not convinced that taking resveratrol supplements or extract will have much payoff. As with all herbs and extracts, you can’t be sure exactly what you’re getting and how effective the product may be.
Dosage recommendations vary depending on your current health and symptoms, but most resveratrol supplements are typically taken in about 250 to 500 milligrams/day dosages. It’s important to point out that this is generally lower than the amounts that have been shown to be beneficial in studies, but it’s not clear if taking very high doses is safe.
Some adults choose to consume up to two grams daily (2,000 milligrams). According to the New York Academy of Sciences, studies have found resveratrol to be safe and reasonably well-tolerated at doses of up to five grams per day, but this shouldn’t be taken without speaking with your doctor. *
