Houston Heat: Is Sunscreen Blocking Liver Enzymes?

By Franklin Everett Shaw

January 26, 2026

The Houston sun isn’t just hot; it’s relentless. We slather on sunscreen, thinking we’re doing our skin a favor, but what if that protection came with a hidden cost?

Many sunscreens contain chemicals that, while effective at blocking UV rays, may also disrupt our liver enzymes. For Houstonians, constantly exposed to intense sunlight, this is a serious concern. Let’s dive into the science and find safer ways to stay protected.

The liver is your body’s detoxification powerhouse. It processes everything from medications to environmental toxins. Liver enzymes, like ALT and AST, are crucial for these processes. When these enzymes are elevated, it can indicate liver stress or damage.

Several common sunscreen ingredients have been flagged for potential endocrine disruption and, indirectly, liver enzyme interference. These include:

• Oxybenzone: A widely used UV filter that can be absorbed through the skin. Studies have shown it can act as an endocrine disruptor and may affect liver function in animal models.
• Octinoxate: Another common UV filter with similar concerns to oxybenzone regarding hormone disruption and potential liver effects.
• Homosalate: While generally considered less problematic than oxybenzone, high concentrations have shown some estrogenic activity in lab studies.

It’s important to note that most studies are in vitro (in a lab) or on animals. Human studies are limited, and the exact impact on liver enzymes is still being researched. However, the potential for harm, especially with frequent and prolonged use, warrants caution.

Houston’s climate exacerbates the problem. We’re not just applying sunscreen on vacation; it’s a daily necessity for many. This constant exposure increases the potential for absorption and accumulation of these chemicals in the body.

So, what can Houston residents do? The good news is that safer alternatives exist. Look for sunscreens containing:

• Zinc Oxide: A mineral sunscreen that sits on top of the skin, physically blocking UV rays. It’s considered safe and effective.
• Titanium Dioxide: Another mineral sunscreen with similar properties to zinc oxide.

These mineral sunscreens are less likely to be absorbed into the skin and are generally considered safer for overall health. You can find them at most major retailers in Houston, including:

• Target: Check their “Clean Beauty” section for mineral-based options.
• Whole Foods Market: Offers a wide selection of natural and organic sunscreens.
• CVS and Walgreens: Often carry brands like Blue Lizard and Thinkbaby, which are mineral-based.

When choosing a sunscreen, read the label carefully. Avoid products containing oxybenzone, octinoxate, and homosalate. Look for “non-nano” zinc oxide or titanium dioxide to ensure the particles are large enough not to be absorbed into the skin.

Beyond sunscreen, supporting liver health is crucial, especially for those active in Houston’s heat. Here’s how:

• Stay Hydrated: Water is essential for liver function. Aim for at least eight glasses of water a day, especially when exercising or spending time outdoors.
• Eat a Liver-Friendly Diet: Focus on fruits, vegetables, and whole grains. Include foods like grapefruit, beets, and garlic, which are known to support liver detoxification.
• Limit Alcohol Consumption: Alcohol puts extra stress on the liver. If you drink, do so in moderation.
• Consider Liver-Supporting Supplements: Milk thistle and dandelion root are popular herbal supplements that may help support liver function. Consult with your doctor before starting any new supplements.

Here’s a practical example: Let’s say you’re a construction worker in Houston, spending hours in the sun every day. You’re applying sunscreen multiple times a day. Switching to a mineral-based sunscreen with zinc oxide can significantly reduce your exposure to potentially harmful chemicals.

Furthermore, packing a lunch with liver-friendly foods like a salad with beets and grapefruit, and drinking plenty of water throughout the day, can help support your liver’s ability to process toxins.

One common mistake is assuming that a higher SPF automatically means better protection. SPF only measures protection against UVB rays, which cause sunburn. It doesn’t measure protection against UVA rays, which contribute to skin aging and cancer.

Look for “broad spectrum” sunscreens that protect against both UVA and UVB rays. Also, remember that sunscreen needs to be reapplied every two hours, or more often if you’re sweating or swimming.

Another pitfall is relying solely on sunscreen for sun protection. Sunscreen should be part of a comprehensive sun safety strategy. Wear protective clothing, such as long sleeves and hats, and seek shade during the hottest part of the day (typically between 10 am and 4 pm).

For Houston residents, the combination of intense sun exposure and potentially harmful sunscreen ingredients presents a unique challenge. By choosing safer sunscreen alternatives, supporting liver health through diet and lifestyle, and practicing comprehensive sun safety, we can protect our skin and our overall well-being.

Don’t just blindly trust the marketing claims on sunscreen bottles. Do your research, read the labels, and make informed choices. Your liver will thank you.