Share ConsumerLab.com's information with family and friends — or just send to yourself. Simply provide an email address below.
You must provide a valid email address.
Your email address*:
Your name*: Send me a copy
Email Address where it's going*:
*Addresses and name will only be used for sending this message.
Additional message (optional):
Your message has been sent. Thanks for sharing!
CoQ10 Side Effects
Question: What are CoQ10 side effects?
Answer: CoQ10 supplements are generally well-tolerated, even when taken in relatively high doses. Rarely, gastrointestinal symptoms such as nausea and diarrhea have been reported, as has mild insomnia. Piperine, which is sometimes added to CoQ10 supplements to increase bioavailability, may also cause side effects, and may interact with certain medications. For more details, plus how to minimize the occurrence of CoQ10 side effects, see the Concerns and Cautions section of the CoQ10 and Ubiquinol Supplements Review.