It’s common to notice more hair shedding during the colder months, and many people assume it’s just part of the seasonal cycle. While changes in weather can play a role, they’re not always the full story. In some cases, increased hair loss may be connected to something happening beneath the surface—like a shortage of key nutrients, including vitamin D.

Vitamin D is essential for overall health and supports a wide range of functions in the body. It helps maintain strong bones, supports the immune system, and contributes to healthy skin. Despite its importance, many people have low levels—especially during fall and winter when sunlight exposure decreases. Since the body produces vitamin D through sunlight, shorter days and more time indoors can lead to deficiency without people even realizing it.

Beyond its well-known benefits, vitamin D is also linked to hair health. It plays a role in supporting hair follicles—the tiny structures responsible for growing hair. When levels are too low, the normal hair growth cycle can be disrupted, which may lead to increased shedding or slower regrowth. While vitamin D isn’t the only factor involved in hair loss, it can be an important piece of the puzzle.

Maintaining balanced vitamin D levels can support overall wellness, including healthier hair. Simple steps like spending time outdoors, eating vitamin D–rich foods, or consulting a healthcare professional about supplements can help. If hair loss becomes noticeable or persistent, it may be worth looking beyond seasonal changes and considering whether your body is getting the nutrients it needs.