Clinical trials in humans have found olive leaf extract to be generally well tolerated.[1] There are some reports of stomachache, headache, and acne after supplementation.[2] However, more research is needed to fully understand any potential drawbacks of olive leaf extract supplementation.
What are olive leaf extract’s main drawbacks?
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•Last Updated: May 16, 2025
Olive leaf extract is generally well tolerated, but some people have reported side effects such as stomachache, headache, and acne. Further research is necessary to fully understand its potential drawbacks.