Written by Tara Boustany on
April 27, 2022
Reading Time: 8 minutes

Medically Reviewed by our Medical Affairs Team

Written by Tara Boustany on:

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Did you know that vitamin D is important for more than just bone health? In fact, vitamin D is essential for overall health and well-being. Vitamin D deficiency can cause a number of problems, including brain fog.

If you are experiencing brain fog, there may be a simple solution: vitamin D supplements! In this article, we will discuss some of the best ways to clear vitamin D brain fog.

What exactly is brain fog? 

In short, brain fog is a term used to describe the feeling of being “foggy” or mentally unclear. This can happen for many different reasons, such as vitamin D deficiency, stress, and lack of sleep.

Whatever the cause, there are ways to clear vitamin D brain fog naturally. Some strategies that have been shown to be effective include getting more exposure to sunlight, trying vitamin D supplements, and incorporating brain-boosting foods into your diet.

What is vitamin D, and why is it important? 

Vitamin D is a fat-soluble vitamin that plays an important role in many different areas of health, including brain function. Deficiency in this essential vitamin has been linked to numerous health problems, including depression and cognitive decline.

Vitamin D Brain Fog: Can lack of vitamin D cause brain fog? 

Yes, vitamin D deficiency can cause brain fog. As a fat-soluble vitamin, vitamin D is important for many functions in our bodies, including cognitive function and mood regulation. When we are low on this essential vitamin, we may experience symptoms such as fatigue, depression, and mental confusion. 

What are the symptoms of vitamin D deficiency brain fog? 

Some common symptoms of vitamin D deficiency brain fog include overall fatigue, trouble focusing or concentrating, and mental “fogginess.” If you are experiencing any of these symptoms and suspect that your lack of vitamin D may be the cause, it’s important to speak with your healthcare provider about getting tested for a vitamin D deficiency. 

What are the neurological symptoms of vitamin D deficiency? 

Some of the neurological symptoms of vitamin D deficiency include poor memory, lack of motivation, and depression. If you’re experiencing any of these symptoms along with brain fog, it’s important to get a vitamin D level test to determine whether your brain fog may be due to insufficient vitamin D levels. 

Depression or symptoms of depression 

Depression is a serious mental illness that affects millions of people each year. It is characterized by a persistent feeling of sadness and loss of interest in activities that were once enjoyed. Other symptoms of depression include fatigue, changes in appetite, sleep disturbance, and feelings of guilt or worthlessness.

Symptoms of dementia 

Dementia is a neurological condition that affects the brain and results in impaired thinking, memory, and behavior. It is a progressive disease, which means it worsens over time. Symptoms of dementia can be mild at first but eventually become severe enough to interfere with daily activities.

Signs and symptoms include:

  • problems with planning or problem-solving
  • confusion in familiar places
  • changes in mood or behavior
  • decreased motivation.

Chronic headaches 

Chronic headaches are also a common symptom of vitamin D deficiency. Most commonly, people with chronic headaches experience tension-type headaches, which cause pressure or tightness around the head and neck. Other common types of chronic headaches include migraines, cluster headaches, and sinus infections.

Mood swings 

Mood swings may not seem like that big of a deal, but if they are severe, they can interfere with your daily life. People who suffer from mood swings have difficulty maintaining healthy relationships, managing their work life, and caring about their overall health.

How to Treat Brain Fog 

If you think your brain fog may be caused by a vitamin D deficiency, there are a few things you can do to treat it. 

The first step is to get your vitamin D levels checked. This can be done with a simple blood test. If your levels are low, your healthcare provider will likely recommend a vitamin D supplement or increased sun exposure to raise your levels.

Other ways to combat brain fog include exercising regularly, eating a healthy diet, getting enough sleep each night, and reducing stress in your life.

If you are experiencing more severe symptoms of brain fog such as depression or dementia, talk to your healthcare provider about other treatment options that may be available. With the right treatment and lifestyle changes, you can clear your vitamin D deficiency and enjoy better mental health and clearer thinking.

1. Maintain a healthy, brain-friendly diet 

There are a number of things you can do to include healthy, brain-friendly food in your diet. The first step is to make sure you are eating enough protein. Protein is essential for overall health and plays a role in neurotransmitter production and maintenance. Good sources of protein include meat, poultry, fish, eggs, dairy products, legumes, and nuts.

In addition to protein, be sure to include plenty of brain-boosting foods in your diet. These include high-quality fats like olive oil, avocados, fatty fish, nuts and seeds, fruits and vegetables rich in antioxidants, and complex carbohydrates found in whole grains.

Finally, make sure you are drinking enough water each day. Dehydration can exacerbate brain fog and make it more difficult to think clearly and focus. Try to drink at least 8 cups of water per day, or more if you are active or live in a warm climate.

2. Consider taking supplements for brain fog 

B Complex

B complex vitamins are a group of essential nutrients that help support the function and health of your brain and nervous system. A B complex supplement can help ensure you are getting all the vitamins and minerals your body needs to function at its best.

Vitamin C 

Vitamin C is a powerful antioxidant that helps protect your brain from damage caused by free radicals. Free radicals are unstable molecules that can cause cell damage and lead to disease. Vitamin C also helps improve blood flow to the brain and has been shown to reduce inflammation.

Vitamin D 

Vitamin D is a nutrient that is essential for bone health and has been linked to a number of other health benefits, including reducing the risk of dementia and improving cognitive function. A vitamin D supplement will help boost your body’s natural production of this essential nutrient.

Vitamin E 

Vitamin E is another potent antioxidant that helps protect your brain from free radical damage. It has also been linked to improved cognitive function and a lower risk of dementia.

Vitamin K

Vitamin K is important for brain health and function. It can help protect your brain from oxidative stress and damage caused by free radicals, as well as improve cognitive performance. A vitamin K supplement may be a good option if you are not getting enough of this nutrient through diet alone.

Omega-3 Fatty Acid 

Omega-3 fatty acids are a type of healthy fat that is essential for brain and heart health. These fats can help improve cognitive function, reduce inflammation, and protect against age-related cognitive decline. A fish oil supplement is a good way to increase your intake of omega-3 fatty acids.


Magnesium is a mineral that is important for many different bodily functions, including brain function. It can help improve cognitive performance, reduce stress levels, and protect against age-related cognitive decline. A magnesium supplement may be a good option if you are not getting enough of this nutrient through diet alone.


A less-well known vitamin, L-theanine is an amino acid that can help improve cognitive function and reduce stress levels. It is found naturally in tea, but can also be taken in supplement form.

3. Spend time in nature and get some sun

One of the best (and easiest!) ways to clear brain fog is to spend time in nature and get some sun. Being outdoors in nature has been shown to improve cognitive function, reduce stress levels, and promote overall health and well-being.

4. Get regular aerobic exercise 

Regular aerobic exercise is one of the best things you can do for your brain health. Exercise has been shown to improve cognitive function, reduce stress levels, and protect against age-related cognitive decline.

5. Keep rehydrating 

As we have seen, dehydration can contribute to brain fog and make it more difficult to think clearly and focus. Make sure you are drinking enough water each day, and consider adding an electrolyte-rich beverage to your diet if you are active or live in a warm climate.

6. Practice mindfulness 

Meditation and mindfulness are two practices that can help reduce stress levels and improve cognitive function. Meditation involves sitting quietly and focusing on your breathing, while mindfulness can also be achieved simply by focusing on your current thoughts and feelings.

7. Play brain games 

Keeping your mind active and engaged can help reduce brain fog and improve cognitive function. Playing brain games and solving puzzles are two great ways to keep your mind sharp.

8. Develop healthy sleeping habits 

Getting enough quality sleep is important for overall health and well-being, and it can also help reduce brain fog. Developing healthy sleeping habits, such as avoiding screen time before bed and sticking to a regular sleep schedule, can help you get the rest you need.

9. Take breaks throughout the day 

Taking regular breaks throughout the day can also help improve your brain health and reduce brain fog. When you are feeling overwhelmed or stressed, take a few minutes to yourself to do something calming, such as deep breathing exercises or a quick walk around the block. 

10. Stay socially connected 

It’s so important to have people you trust that you can confide in and just enjoy being around! Staying socially connected and engaged can help reduce stress levels and improve brain function. Connecting with friends and family, volunteering, and participating in social activities are all great ways to stay socially active.

11. Consider therapy 

If you are dealing with chronic brain fog and are having difficulty managing it on your own, seeking therapy or counseling may be a good option. Talking to a therapist can help you address the underlying causes of brain fog, learn effective coping strategies, and find support from others who have also dealt with this condition. 

Can vitamin D deficiency be diagnosed? 

Yes, vitamin D deficiency can be diagnosed through a variety of tests, including blood tests, urine tests, and imaging scans. A healthcare provider may recommend one or more of these tests if they suspect that you have a vitamin D deficiency. They will typically look at your symptoms, medical history, and other risk factors to determine whether further testing is necessary. 

What else happens when you’re low on vitamin D? 

There are plenty of health issues linked to a vitamin D deficiency. Here are a few changes you might notice if you’re levels have dipped: 

Your mood might change

Vitamin D is essential for healthy brain function, and a deficiency can lead to mood swings, irritability, and depression. If you’re feeling down or stressed out, it may be worth getting your vitamin D levels checked to see if they are contributing to your mood issues.

Your digestion could suffer 

Vitamin D is also involved in the absorption of nutrients from the gut, so a deficiency can lead to problems with digestion and nutrient absorption. This can manifest as digestive issues such as constipation, diarrhea, and stomach pain.

You may stay sick 

This essential nutrient is important for immune system health and helps fight against infections, so a deficiency could make you more susceptible to colds and other illnesses. You may also find that your recovery time from illness is longer if vitamin D levels are low. 

Your muscles and bones might ache 

Vitamin D plays a key role in muscle and bone health, so deficiencies can lead to aches, pains, or other issues with your muscles and bones. If you’re experiencing unexplained pain or are noticing changes in the condition of your bones, it may be worth getting tested for vitamin D deficiency. 

You might feel fatigued regularly 

Feeling sluggish or fatigued is a common factor to vitamin D brain fog. Low levels of vitamin D may sap your energy and leave you feeling tired or fatigued throughout the day. Unfortunately, this can also make it more difficult to develop healthy sleep habits and stay active, which in turn can contribute to brain fogginess.

For women, you could have pregnancy complications 

Low vitamin D levels have been linked to pregnancy complications such as preeclampsia, gestational diabetes, and preterm labor. If you’re planning on getting pregnant or are currently pregnant, it’s important to make sure your vitamin D levels are in a healthy range so that you can avoid these potential issues.

The Bottom Line 

Vitamin D is an important nutrient for overall health, but it’s also essential for healthy brain function. If you’re dealing with brain fog, it may be worth checking your vitamin D levels to see if a deficiency is to blame.

There are a variety of ways to treat and prevent vitamin D deficiency, so talk to your healthcare provider about the best option for you. In the meantime, try to get regular sun exposure, eat vitamin D-rich foods, and take a supplement if necessary to maintain healthy levels of this important nutrient.

For more information about vitamin D deficiency brain fog and general brain health, check out our other posts and join the online community!

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