Chicago Winters, Vitamin D, and Your Skin Tone

Photograph of Franklin Everett ShawBy Franklin Everett Shaw
March 19, 2026

The wind howls off Lake Michigan, a frigid kiss that bites through even the thickest layers. Chicago winters are legendary, not just for their bone-chilling temperatures, but also for the oppressive gray skies that seem to last for months. For those of us with darker skin tones, this lack of sunlight isn’t just a seasonal bummer; it’s a serious threat to our Vitamin D levels.

Vitamin D deficiency is rampant in Chicago, especially amongst Black and Brown communities. Our skin’s melanin acts as a natural sunscreen, which is fantastic during the summer, but it significantly reduces our ability to synthesize Vitamin D from sunlight during the winter months. This isn’t just about feeling a little sluggish; it’s about bone health, immune function, and even mental well-being.

So, how do we, as Chicagoans with darker skin, combat this deficiency and thrive during the long, dark winter? It’s a multi-pronged approach, focusing on supplementation, diet, and strategic sun exposure.

Let’s start with supplementation. This is arguably the most crucial step. Forget the generic “take a Vitamin D supplement” advice. We need specifics. The recommended daily allowance (RDA) of 600 IU is often insufficient for individuals with darker skin, especially during winter in a place like Chicago.

A good starting point is 2000-4000 IU of Vitamin D3 daily. However, it’s essential to get your Vitamin D levels tested by your doctor. Ask for a 25-hydroxyvitamin D blood test. This will give you a baseline and allow you to adjust your dosage accordingly. Aim for a level between 40-60 ng/mL.

Don’t just grab any Vitamin D supplement off the shelf at Walgreens on State Street. Look for Vitamin D3 (cholecalciferol), which is more effective than Vitamin D2 (ergocalciferol). Consider a brand that’s third-party tested for purity and potency. Many supplements are underdosed or contain contaminants.

Now, let’s talk about diet. While supplementation is key, we can also boost our Vitamin D intake through food. Unfortunately, Vitamin D is not naturally abundant in many foods.

Fatty fish like salmon, tuna, and mackerel are good sources. Canned salmon, readily available at most grocery stores in Chicago neighborhoods like Pilsen or Rogers Park, is a budget-friendly option. Look for salmon with bones, as the bones are a good source of calcium, which works synergistically with Vitamin D.

Fortified foods are another option. Milk, yogurt, and some cereals are often fortified with Vitamin D. Check the labels carefully, as the amount of Vitamin D can vary significantly. Eggs are a decent source, with about 40 IU per egg.

Here’s a Chicago-specific tip: Incorporate more mushrooms into your diet. Certain mushrooms, when exposed to UV light, can produce significant amounts of Vitamin D. You can even buy mushrooms that have been specifically treated with UV light to boost their Vitamin D content. Check out local farmers markets in neighborhoods like Logan Square or Wicker Park for these specialty mushrooms.

Finally, let’s discuss strategic sun exposure. This is the trickiest part, especially in Chicago during the winter. The sun’s angle is low, and the days are short. Plus, we’re often bundled up in layers of clothing.

The key is to maximize your exposure during the peak sunlight hours, typically between 10 am and 2 pm. Even on cloudy days, some UV rays penetrate the clouds. Aim for at least 15-20 minutes of exposure, with as much skin exposed as possible (while still being mindful of the cold!).

This might mean taking a walk during your lunch break, even if it’s just around the block in the Loop. Or, if you work from home, try to position your desk near a window and spend some time in direct sunlight.

A common mistake is relying on sunlight through a window. Glass blocks UVB rays, which are necessary for Vitamin D synthesis. You need to be outside, even if it’s just for a short period.

Another challenge is the cold. It’s tempting to stay indoors all winter, but even a few minutes of sun exposure can make a difference. Dress warmly, but try to expose your face and hands.

Consider investing in a UV lamp. While not a perfect substitute for natural sunlight, a UV lamp can provide a controlled dose of UVB radiation. Be sure to choose a lamp that’s specifically designed for Vitamin D production and follow the manufacturer’s instructions carefully. Overexposure to UV radiation can be harmful.

Here’s a crucial point: Don’t rely solely on sun exposure during the winter in Chicago. It’s simply not enough to maintain adequate Vitamin D levels, especially for those with darker skin. Supplementation and dietary adjustments are essential.

One pitfall to avoid is thinking that you can “catch up” on Vitamin D during the summer. While summer sun exposure will certainly boost your levels, it’s important to maintain a consistent intake throughout the year. Vitamin D is stored in the body, but it’s not a long-term storage solution.

Another common mistake is not getting your Vitamin D levels tested regularly. This is the only way to know if your supplementation and lifestyle changes are working. Aim to get tested at least once a year, preferably in the late winter or early spring, when your levels are likely to be at their lowest.

Combating Vitamin D deficiency in Chicago’s brutal winters requires a proactive and personalized approach. It’s not a one-size-fits-all solution. By understanding the unique challenges we face as individuals with darker skin, and by implementing a combination of supplementation, dietary adjustments, and strategic sun exposure, we can thrive, even when the skies are gray and the wind is howling off Lake Michigan. Remember to consult with your doctor to determine the best course of action for your individual needs. Stay warm, stay healthy, and embrace the Chicago winter with confidence.

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