Why Fall is the Perfect Time to Start Vitamin D

Maria Mojica-Rangel • September 23, 2025

Why Fall is the Perfect Time to Start Vitamin D

As the days grow shorter and cooler, many of us naturally spend less time outdoors. While cozy sweaters and warm drinks are a highlight of fall, less sunlight also means our bodies may not make enough vitamin D. This important nutrient does more than support strong bones; it plays a key role in both mental health and immunity.

Vitamin D and Mood

Research has consistently linked low vitamin D levels with symptoms of depression and low mood. For many people, taking a supplement can help improve mood and reduce these symptoms, especially if levels are already low. Scientists believe vitamin D supports the brain by boosting proteins like BDNF, which helps with healthy brain function and emotional balance.

As fall turns into winter, some people notice their mood dips; a phenomenon often tied to less sunlight. Supporting vitamin D levels during this time may be one way to help protect mental health and keep spirits lifted.

Vitamin D and Immunity

Vitamin D is also vital for a strong immune system. It helps the body fight off infections such as colds and flu, which tend to increase in the fall and winter months. Low levels of vitamin D have been linked to more frequent illness and even an increased risk of autoimmune conditions. By helping regulate inflammation, vitamin D keeps the immune system balanced and ready to respond when needed.

Getting Enough Vitamin D

Vitamin D comes from sunlight, certain foods (like fatty fish, eggs, and fortified milk), and supplements. However, during fall and winter, it’s common for people to fall short. A simple blood test can check your vitamin D level, and many adults benefit from taking a daily supplement; usually 2,000 IU or more, depending on individual needs.

Because very high doses can be harmful, it’s best to check with your healthcare provider before starting supplements, especially if you take other medications or have health conditions.

The Bottom Line

Fall is the perfect season to check in on your vitamin D. By supporting both mood and immunity, vitamin D can help you feel your best through the darker months of the year. If you’re unsure about your levels, talk with your provider about testing and whether supplementation is right for you.

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