Denver Hikers: Are Your Protein Bars Secretly Sunscreen Saboteurs?

By Franklin Everett Shaw

February 18, 2026

Ever felt like you’re doing everything right – slathering on sunscreen, wearing a hat, seeking shade – yet still end up with a nasty sunburn after a hike near Denver? The culprit might be hiding in plain sight: your seemingly healthy protein bar.

It’s a cruel irony, isn’t it? You’re fueling your body for an intense climb up, say, Mount Bierstadt, with a snack packed with protein and vitamins, only to unknowingly increase your vulnerability to the sun’s harsh rays.

The key lies in understanding photosensitivity, a heightened reaction of the skin to sunlight. Certain substances, when ingested or applied topically, can make your skin more susceptible to UV damage. And surprisingly, some common ingredients in protein bars can act as photosensitizers.

Think about it: Denver’s altitude amplifies the sun’s intensity. For every 1,000 feet you ascend, UV radiation increases by approximately 4-5%. Combine that with the reflective properties of snow, which can bounce UV rays back onto your skin, and you’ve got a recipe for a serious burn, even on a cloudy day.

So, what are these sneaky ingredients lurking in your protein bars? Citrus fruits and celery are two of the biggest offenders.

Citrus fruits, particularly limes, lemons, and oranges, contain compounds called psoralens. These psoralens absorb UV radiation and then release that energy into your skin cells, causing inflammation and damage. Even small amounts of citrus zest or juice added for flavor can be enough to trigger a reaction in sensitive individuals, especially at high altitudes.

Celery, another seemingly innocuous ingredient, also contains psoralens. While less potent than citrus, celery’s presence in a protein bar, combined with other potential photosensitizers, can contribute to increased sun sensitivity.

But how do you identify these ingredients? Read the labels carefully. Look for terms like “citrus zest,” “lemon oil,” “orange extract,” or simply “celery.” Don’t assume that because a protein bar is marketed as “natural” or “healthy” that it’s free from these compounds.

Now, let’s talk about alternatives. Fortunately, there are plenty of protein bar options readily available in Colorado that are less likely to cause photosensitivity.

Look for bars that are based on nuts, seeds, and whole grains, and that are flavored with ingredients like:

• Chocolate: Dark chocolate, in particular, is rich in antioxidants and doesn’t contain photosensitizing compounds.
• Berries: Blueberries, raspberries, and strawberries are packed with antioxidants and are generally safe for sun-sensitive individuals.
• Maple Syrup: A natural sweetener that doesn’t contain psoralens.
• Peanut Butter: A good source of protein and healthy fats.

Some specific brands and flavors you might find in Denver-area stores include:

• RXBAR: Many of their flavors are based on dates, nuts, and egg whites, and are free from citrus and celery.
• Larabar: These bars are made from a simple blend of fruits, nuts, and spices. Just be sure to avoid flavors that contain citrus.
• GoMacro: Offers a variety of vegan protein bars with flavors like peanut butter chocolate chip and banana almond butter. Again, check the label for citrus.

Beyond choosing the right protein bar, it’s crucial to adopt a comprehensive sun protection strategy when hiking in the Rocky Mountains.

Here are some practical tips:

• Apply Sunscreen Liberally and Often: Use a broad-spectrum sunscreen with an SPF of 30 or higher. Apply it 30 minutes before heading out and reapply every two hours, or more often if you’re sweating or swimming. Don’t forget to apply sunscreen to often-overlooked areas like your ears, neck, and the back of your hands.
• Wear Protective Clothing: Cover as much skin as possible with lightweight, long-sleeved shirts, pants, and a wide-brimmed hat. Look for clothing with a UPF (Ultraviolet Protection Factor) rating for added protection.
• Seek Shade: Take breaks in shaded areas, especially during the peak sun hours of 10 a.m. to 4 p.m.
• Wear Sunglasses: Protect your eyes from UV radiation with sunglasses that block 100% of UVA and UVB rays.
• Hydrate: Staying hydrated helps your skin stay healthy and resilient. Drink plenty of water before, during, and after your hike.

A common mistake hikers make is underestimating the power of the sun at high altitudes. They might think that because it’s cloudy or cool, they don’t need to worry about sun protection. This is a dangerous misconception. UV radiation can penetrate clouds, and the cooler temperatures can mask the feeling of burning.

Another pitfall is relying solely on sunscreen. While sunscreen is essential, it’s not a foolproof solution. It can wear off, be applied unevenly, or not provide adequate protection against all types of UV radiation. That’s why it’s important to combine sunscreen with other sun protection measures, like protective clothing and shade.

Finally, don’t forget to consider the medications you’re taking. Some medications, such as certain antibiotics, antidepressants, and diuretics, can also increase your sensitivity to the sun. Talk to your doctor or pharmacist about any potential photosensitivity risks associated with your medications.

By being aware of the potential photosensitizing ingredients in your protein bars and adopting a comprehensive sun protection strategy, you can enjoy your hikes in the beautiful Rocky Mountains without risking a painful and potentially dangerous sunburn. Remember, knowledge is power, and a little bit of planning can go a long way in protecting your skin. So, next time you’re packing your backpack for a hike near Denver, take a closer look at your protein bar label and make sure you’re not unknowingly sabotaging your sun protection efforts. Your skin will thank you for it.