Seasonal affective disorder (SAD) and CBD

Can CBD help SAD? 

Seasonal Affective Disorder (SAD) is a recognised form of depression that follows a seasonal pattern. Most commonly, symptoms appear during the autumn and winter months and ease during spring or summer, but for some people, the pattern can be reversed.

If you've experienced a persistent low mood that coincides with certain times of year, you're not alone. In the UK, an estimated 2 million people live with SAD. While the condition varies in severity, it can significantly impact daily life. Fortunately, there are a number of support options available, including natural options like CBD.

What is Seasonal Affective Disorder?

SAD is a type of depression that occurs at particular times of the year – most commonly during periods with reduced daylight. While the causes are not fully understood, research suggests that reduced exposure to sunlight can affect the body's internal clock (circadian rhythm) and disrupt levels of key hormones, namely serotonin, which influences mood, and melatonin, which affects sleep patterns. 

The result? Symptoms that can include:

• Low mood that persists for weeks or months

• Loss of interest in usual activities

• Fatigue or low energy

• Sleep disturbances (including oversleeping)

• Changes in appetite or weight

• Difficulty concentrating

• Feelings of hopelessness or worthlessness

SAD is more than a seasonal slump or "the winter blues" – it's a condition that, for some people, may require support. If your symptoms are interfering with your daily life, it's important to speak to a healthcare professional.

CBD and mood

CBD (short for cannabidiol) is a naturally occurring compound found in the Cannabis sativa plant. It's non-intoxicating and interacts with the body's endocannabinoid system, which plays a role in regulating mood, stress, sleep and more.

Emerging research suggests that CBD may have antidepressant-like and anxiolytic (anti-anxiety) effects. In particular:

• CBD appears to activate serotonin receptors, specifically 5-HT1A receptors, which are known to influence mood regulation. This mechanism is also targeted by many common antidepressants.

• Animal studies suggest CBD may reduce stress-induced behaviours and improve resilience to chronic stress.

While more large-scale human studies are needed, especially in relation to SAD specifically, early evidence supports the potential of CBD to support mood and emotional balance.

How might CBD help with SAD? 

While CBD is not a medical treatment for SAD, it may offer natural support for some of the symptoms commonly associated with the condition. SAD often involves a combination of low mood, anxiety, fatigue, sleep disruption and cognitive difficulties – areas where CBD has shown potential research-based benefits.

1. Mood regulation

One of the core challenges of SAD is a persistent low mood that can last for weeks or months. Research has suggested that CBD may influence serotonin signalling in the brain, a key neurotransmitter involved in regulating mood, motivation and overall emotional balance.

The effects of CBD can vary from person to person and it should not replace medical treatment. However, as part of a wellbeing routine, CBD may help support emotional equilibrium during more challenging months.

2. Stress and anxiety reduction

SAD is often accompanied by increased anxiety, particularly social withdrawal, irritability and a sense of being overwhelmed. CBD has been studied for its anxiolytic (anti-anxiety) properties, and several human trials have shown promising results.

For instance, a study published in Neurotherapeutics noted that CBD significantly reduced anxiety in both animal and human models, especially in conditions such as generalised anxiety disorder and social anxiety disorder.

CBD is thought to affect GABA activity (a calming neurotransmitter) and the hypothalamic-pituitary-adrenal (HPA) axis, which controls the body's stress response. This calming influence may be especially useful during seasonal transitions when anxiety tends to peak.

3. Improved sleep quality

Disturbed sleep is a hallmark symptom of SAD. Some people oversleep but still feel tired, while others struggle to fall or stay asleep. Poor sleep not only worsens mood and concentration but can also create a vicious cycle that deepens feelings of fatigue and emotional instability.

CBD has been found to have a regulating effect on sleep, particularly when sleep is disrupted by stress or anxiety. Studies suggest that CBD may increase total sleep time and improve sleep quality by helping people fall asleep faster and stay asleep longer. This is likely due to its ability to calm the nervous system and reduce cortisol, the hormone associated with stress and alertness.

At Goodrays, many people report using CBD oils or drinks in the evening as part of a calming bedtime routine to help wind down and improve sleep quality.

4. Anti-inflammatory properties

Emerging research has begun to explore the link between chronic low-grade inflammation and depression, including SAD. Some scientists believe that inflammation may affect the brain's ability to produce and regulate neurotransmitters, contributing to depressive symptoms.

CBD has well-documented anti-inflammatory properties, which are thought to work by interacting with immune cells and reducing the production of pro-inflammatory cytokines. While this link between inflammation, depression and CBD is still under investigation, the early evidence is encouraging.

By supporting a healthy inflammatory response, CBD may offer indirect mood benefits and help improve overall mental resilience – particularly during times of increased stress and low energy.

Using CBD to support your mental wellbeing 

 

CBD comes in a range of forms, each suited to different routines and preferences. At Goodrays, we've designed our CBD products to integrate seamlessly into daily life:

CBD drinks: Infused with 30mg of high-quality CBD and a daily dose of vitamin D, our CBD drinks are a convenient, tasty way to support mood and immune health.

CBD gummies: A great-tasting, consistent-dose option – a simple way to feel centred when life gets busy.

CBD oils: Ideal for quick, flexible use, with rapid absorption and precise dosing.

If you're unsure how much to take, check out our CBD dosing guide to get started.

What about vitamin D? 

 

Low vitamin D levels are frequently found in people with SAD, particularly during winter, due to reduced sunlight exposure. Although more research is needed, vitamin D may play a role in energy regulation and mood support.

CBD drinks can contain your recommended daily intake of vitamin D, offering a dual benefit – supporting both your immune system and mental wellbeing.

Lifestyle tips for managing SAD

 

While CBD may support your wellness journey, it works best alongside broader lifestyle strategies. These include:

Light therapy: A clinically recommended treatment that mimics sunlight to help regulate melatonin and serotonin production.

Movement: Regular physical activity can boost mood by increasing endorphins and serotonin.

Mindfulness: Practices like meditation, deep breathing, and journaling help reduce stress and promote emotional balance.

Sleep hygiene: Aim for consistent sleep and wake times, and avoid screen time before bed.

Spending time outdoors: Even on cloudy days, natural light exposure can support your circadian rhythm.

When to seek professional support 

 

If symptoms become unmanageable or persist beyond a few weeks, contact your GP or mental health professional. Treatment options for SAD may include talking therapies, medication and light therapy, depending on individual needs.