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CBD Oil Side Effects UK: What to Know in 2025 | Valley CBD
CBD Oil Side Effects UK: An Honest Guide
By David Smith | Last Updated: 17th December 2025
As CBD oil becomes a more common part of wellness routines across the UK, a natural question arises: "Are there any side effects?" It's a sensible and important question to ask before trying any new supplement.
The good news is that, according to a critical review report by the World Health Organization (WHO), CBD is generally well tolerated with a good safety profile. Side effects are typically mild and uncommon, often resulting from taking too high a dose. This guide provides an honest look at what they are and how to avoid them.
Potential Mild Side Effects of CBD Oil
When side effects do occur, they are most often one of the following:
- Dry Mouth: Sometimes referred to as 'cottonmouth', this is a fairly common and mild side effect. It can be easily managed by drinking plenty of water.
- Drowsiness: Especially at higher doses, CBD can have a relaxing effect that may lead to drowsiness. This is why many people use it for sleep, but it's something to be aware of during the day.
- Changes in Appetite: CBD can cause a slight increase or decrease in appetite for some individuals.
- Digestive Issues: In rare cases, some people may experience mild diarrhoea or an upset stomach. This can sometimes be related to the carrier oil (like MCT oil) rather than the CBD itself.
The key takeaway is that these effects are almost always linked to dose. By following the "start low and go slow" method, you give your body time to adjust and can easily find a dose that gives you benefits without unwanted effects.
"I was a bit nervous about side effects, to be honest. But I took the advice to start with just one drop of the 1000mg oil. I felt fine, so after a few days, I moved up to two. I've found my perfect dose and haven't had a single issue. The 'start low' advice really is key!"
- Emily, London
Frequently Asked Questions (FAQs)
Q: Is CBD oil addictive?
A: No. According to the World Health Organization (WHO), CBD exhibits no effects indicative of any abuse or dependence potential. It is not an addictive substance.
Q: Can CBD make you feel tired the next day?
A: If you take too high a dose, especially in the evening, you may experience some mild drowsiness the next morning. This is a key sign to reduce your dosage slightly to find your 'sweet spot'.
Q: Does CBD oil interact with medication?
A: Yes, this is the most important consideration. CBD can interact with certain medications, particularly those that come with a 'grapefruit warning'. It is absolutely essential to speak with your doctor or pharmacist before taking CBD if you are on any prescription medication.
Safety First, Wellness Always
CBD is a safe and natural supplement for most people. By choosing a high-quality product from a reputable brand and taking a mindful approach to your dosage, you can safely explore its benefits.
Have more questions? The Valley CBD team is always here to help you on your wellness journey.
About the Author: David Smith
David is the Head of Wellness at Valley CBD and a passionate advocate for natural health solutions. With years of experience researching the benefits of cannabinoids, he is dedicated to educating consumers on the safe and effective use of CBD.
Disclaimer
This article is for informational purposes only. While CBD is generally considered safe, you should always consult with your doctor before starting any new supplement, especially if you have a medical condition or are taking other medications. This content does not constitute medical advice.
