**Austin's Algae: Is City Sunscreen Fueling Gut Yeast?**

Photograph of Franklin Everett ShawBy Franklin Everett Shaw
November 5, 2025

It’s easy to take for granted the simple act of slathering on sunscreen before heading out for a hike in the Greenbelt or a dip in Barton Springs Pool. But what if that seemingly innocuous habit was subtly disrupting your gut health? In Austin, Texas, recent bans on certain chemical sunscreens are pushing residents towards mineral-based alternatives. While seemingly a win for the environment, this shift might be inadvertently contributing to a less-discussed health concern: gut dysbiosis, specifically Candida overgrowth, due to potential heavy metal contamination in some mineral sunscreens.

The problem isn’t mineral sunscreen itself, but rather the potential impurities and particle sizes within certain formulations. Let’s dive into how this seemingly unrelated issue could be impacting Austinites and what you can do about it.

First, let’s understand the Austin sunscreen situation. The city, along with other coastal areas, has restricted the sale and use of sunscreens containing chemicals like oxybenzone and octinoxate. These chemicals, while effective at blocking UV rays, have been shown to damage coral reefs. This leaves mineral sunscreens, primarily those containing zinc oxide and titanium dioxide, as the go-to alternative.

Now, here’s where the potential problem arises. Mineral sunscreens, while generally considered safer for the environment and less likely to be absorbed into the bloodstream, can sometimes contain heavy metal contaminants like lead, arsenic, cadmium, and mercury. These contaminants can originate from the mining and manufacturing processes of the minerals themselves.

Why does this matter for your gut? Heavy metals, even in small amounts, can disrupt the delicate balance of your gut microbiome. They can damage the intestinal lining, leading to leaky gut syndrome, and create an environment that favors the growth of opportunistic pathogens like Candida. Candida is a type of yeast that naturally lives in your gut, but when it overgrows, it can lead to a range of symptoms, including fatigue, digestive issues, brain fog, and skin problems.

The connection between heavy metals and Candida overgrowth is complex. Heavy metals can weaken the immune system, making it harder for your body to keep Candida in check. They can also interfere with the function of beneficial gut bacteria, further disrupting the balance of the microbiome.

So, how do you navigate this potential health minefield while still protecting yourself from the Texas sun? The key is to be a savvy consumer and make informed choices about the mineral sunscreen you use.

Here’s a step-by-step guide to choosing safer mineral sunscreens in Austin:

  1. Look for Third-Party Testing: Seek out sunscreens that have been independently tested for heavy metal contamination. Certifications like the NSF International mark or testing results from reputable labs are good indicators. Unfortunately, this information isn’t always readily available on the product label, so you may need to do some online research or contact the manufacturer directly.

  2. Choose Non-Nano Particles: Opt for sunscreens that use non-nano zinc oxide and titanium dioxide. Nano-sized particles are smaller and more easily absorbed into the skin, potentially increasing the risk of heavy metal exposure. Look for products that explicitly state “non-nano” on the label. If it doesn’t say, assume it’s nano.

  3. Read the Ingredient List Carefully: Be wary of sunscreens with long lists of unnecessary ingredients. The fewer ingredients, the lower the chance of hidden contaminants. Focus on sunscreens with zinc oxide as the primary active ingredient, as it generally offers broader spectrum protection.

  4. Consider the Source: Research the brand and its commitment to ethical sourcing and manufacturing practices. Companies that prioritize transparency and sustainability are more likely to take steps to minimize heavy metal contamination.

  5. Patch Test: Before applying any new sunscreen all over your body, do a patch test on a small area of skin to check for any allergic reactions or sensitivities.

Beyond choosing the right sunscreen, supporting your gut health through diet and lifestyle is crucial, especially if you live in Austin and are regularly exposed to mineral sunscreens.

Here are some dietary strategies to consider:

  • Limit Sugar and Refined Carbohydrates: Candida thrives on sugar, so reducing your intake of sugary foods and refined carbohydrates can help starve it. This means cutting back on things like processed foods, sugary drinks, white bread, and pasta.

  • Increase Fiber Intake: Fiber helps to promote healthy digestion and supports the growth of beneficial gut bacteria. Good sources of fiber include vegetables, fruits, whole grains, and legumes.

  • Incorporate Probiotic-Rich Foods: Probiotics are live microorganisms that can help to restore the balance of your gut microbiome. Include foods like yogurt (with live and active cultures), kefir, sauerkraut, kimchi, and kombucha in your diet.

  • Consider Anti-Fungal Foods: Certain foods have natural anti-fungal properties that can help to combat Candida overgrowth. These include garlic, ginger, coconut oil, and apple cider vinegar.

  • Stay Hydrated: Drinking plenty of water is essential for overall health and can help to flush out toxins from your body.

It’s also important to be aware of the common pitfalls and mistakes people make when trying to address gut dysbiosis. One common mistake is self-diagnosing and self-treating without consulting a healthcare professional. Gut issues can be complex, and it’s important to get an accurate diagnosis and personalized treatment plan.

Another pitfall is relying solely on dietary changes without addressing other underlying factors that may be contributing to gut dysbiosis, such as stress, lack of sleep, or antibiotic use.

For those in the Austin area seeking professional help, there are several resources available for gut health testing and support.

  • Functional Medicine Practitioners: Functional medicine doctors take a holistic approach to health and can help to identify the root causes of gut issues. Several practices in Austin specialize in gut health.

  • Naturopathic Doctors: Naturopathic doctors use natural therapies to support the body’s healing process. They can provide guidance on diet, lifestyle, and supplements to improve gut health.

  • Registered Dietitians: Registered dietitians can help you develop a personalized meal plan to support your gut health. Look for dietitians who specialize in gut disorders.

  • Specialty Labs: Certain labs offer comprehensive stool testing to assess the composition of your gut microbiome and identify any imbalances or infections.

Living in Austin and adhering to sunscreen regulations doesn’t have to mean sacrificing your gut health. By being informed about the potential risks of heavy metal contamination in mineral sunscreens and taking proactive steps to support your gut microbiome, you can enjoy the Texas sunshine without compromising your well-being. Remember to prioritize third-party tested, non-nano mineral sunscreens and focus on a gut-friendly diet rich in fiber, probiotics, and anti-fungal foods. And when in doubt, seek professional guidance from a qualified healthcare practitioner in the Austin area. Your gut will thank you for it.

The information provided on Core Wellness Guide is intended for general informational purposes only. The content on this site should not be construed as medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare professional before making any changes to your diet, exercise routine, or health regimen. I am not a licensed fitness or health professional. Any exercise or wellness programs or advice you choose to follow are done at your own risk. Core Wellness Guide is not liable for any injuries or damages resulting from the use or misuse of the information on this website. Some of the links on this website are affiliate links, meaning I may earn a small commission if you purchase products through these links. However, I only recommend products that I trust and believe will add value to my readers. Results from fitness and health programs may vary depending on individual factors such as age, gender, and fitness level. Testimonials or success stories on this blog are based on individual experiences and do not guarantee the same results for everyone. This blog may contain links to third-party websites, and I am not responsible for their content, privacy policies, or practices.