Miami Beach Algae: Salt Air Blocking Retinol?

By Franklin Everett Shaw

March 8, 2026

Forget those generic “beach body ready” ads. The real secret to surviving summer in Miami Beach, especially if you’re slathering on retinol, might be lurking right under your feet – or rather, in the shimmering turquoise waters. We’re talking algae.

Retinol, the darling of dermatologists, works wonders for wrinkles and acne. But it also makes your skin incredibly sensitive to the sun. And in Miami Beach, the sun doesn’t play.

But what if we could harness the power of the ocean to fight fire with… well, more ocean?

Miami Beach is teeming with various types of algae, many of which possess natural UV-protective properties. Think of them as nature’s sunscreen.

This isn’t some woo-woo wellness trend. Scientific studies have shown that certain algae produce compounds like mycosporine-like amino acids (MAAs), which act as natural sunscreens by absorbing UV radiation.

So, how can you, a sun-conscious Miami Beach resident, turn this knowledge into a DIY retinol-rescue serum? Let’s dive in.

First, identification is key. You can’t just scoop up any green goo and expect it to shield you from the Florida sun.

Look for these specific types of algae commonly found on Miami Beach:

Ulva lactuca (Sea Lettuce): This bright green algae is easily identifiable by its thin, leafy structure. It’s a good source of antioxidants and may offer some UV protection.
Sargassum spp. (Sargassum Weed): While often considered a nuisance, Sargassum contains compounds that can be beneficial for skin. However, be cautious, as it can also harbor bacteria. Only use fresh, clean samples.
Spirulina spp. (Spirulina): Though not always visible to the naked eye, Spirulina blooms can occur in certain areas. It’s a powerhouse of nutrients and antioxidants, and some studies suggest it has photoprotective qualities.

Important Safety Note: Always harvest algae from clean, unpolluted areas. Avoid areas near storm drains or where there’s visible pollution. And never ingest algae you’ve harvested yourself.

Now, let’s get to the extraction process. This is where things get a little science-y, but don’t worry, it’s manageable.

Harvesting: Collect a small amount of your chosen algae. A handful is plenty for a test batch. Rinse it thoroughly with seawater to remove any sand or debris. Then, rinse again with distilled water.
Drying: Spread the algae on a clean surface (like a baking sheet lined with parchment paper) and let it air dry completely. This can take a few days, depending on the humidity. You can also use a dehydrator on a low setting.
Extraction: Once the algae is completely dry, grind it into a fine powder using a coffee grinder or mortar and pestle. Mix the powder with a carrier oil. Jojoba oil is a good choice because it’s similar to human sebum and readily absorbed by the skin. A ratio of 1 part algae powder to 3 parts oil is a good starting point.
Infusion: Place the mixture in a glass jar and seal it tightly. Let it infuse in a cool, dark place for 2-4 weeks, shaking it occasionally. This allows the beneficial compounds from the algae to dissolve into the oil.
Filtration: After the infusion period, strain the oil through a cheesecloth or fine-mesh sieve to remove the algae particles. You should be left with a greenish-tinged oil.

Application: This algae-infused oil can be applied to your skin before applying retinol at night. It acts as a protective barrier, potentially reducing retinol-induced irritation and sun sensitivity.

Important Considerations:

Patch Test: Before applying the serum to your entire face, perform a patch test on a small area of skin to check for any allergic reactions.
Sunscreen is Still Essential: This DIY algae serum is not a replacement for sunscreen. It’s an extra layer of protection. Always wear a broad-spectrum sunscreen with an SPF of 30 or higher when you’re exposed to the sun, especially when using retinol.
Algae Variability: The UV-protective properties of algae can vary depending on the species, location, and environmental conditions. There’s no guarantee that your homemade serum will provide the same level of protection as commercially available sunscreens.
Potential Pitfalls: One common mistake is using contaminated algae. Always ensure your harvesting location is clean and free from pollutants. Another pitfall is not drying the algae properly, which can lead to mold growth.

Real-World Scenario: Imagine you’re a Miami Beach resident who loves spending weekends at South Pointe Park. You also use retinol to combat those pesky sun-induced wrinkles. By incorporating this DIY algae serum into your routine, you can enjoy your time outdoors with a little extra peace of mind.

This isn’t just about vanity; it’s about protecting your skin from the harsh Florida sun. And what better way to do that than by harnessing the power of the ocean that surrounds us?

While this DIY approach offers a unique and potentially beneficial way to supplement your sun protection, remember that it’s crucial to prioritize safety and use it in conjunction with proven sun protection methods like sunscreen and protective clothing.

So, go ahead, explore the shores of Miami Beach. Just remember to do your research, harvest responsibly, and always prioritize sun safety. Your skin will thank you for it.