Side Effects and Cautions

• Grape seed extract is generally well tolerated when taken by mouth. It has been used safely for up to 8 weeks in clinical trials.
• Side effects that have been reported most often include headache; a dry, itchy scalp; dizziness; and nausea.
• The interactions between grape seed extract and medicines or other supplements have not been carefully studied.
• Tell your health care providers about any complementary and alternative practices you use. Give them a full picture of what you do to manage your health. This will help ensure coordinated and safe care.