How Did Dolphins Help Us Discover A New “Essential” Fatty Acid That Slows Down Aging?

Aging can be a worrying process for many people, especially in the age of social media where new ideas for promoting a longer, healthier life seem to appear every day. From new “life-extending” products to prescriptive diets to grueling exercise routines, there are many competing claims about what your body needs age well.

But among all the hype and complexity, there’s a newly developed, science-backed supplement that could change our perception of longevity. Fatty15 is a daily dietary supplement containing pure pentadecanoic acid (C15:0), which may be the first essential fatty acid to emerge in over 90 years.

An essential nutrient is one that the body needs but cannot produce on its own. Instead, these are obtained through diet to support a healthy lifestyle. This potentially essential new nutrient, which could help fight the effects of aging, owes its discovery to an unlikely source: marine dolphins.

From dolphin aging to human health

When it comes to important scientific discoveries, most people probably imagine white coats and laboratory environments, but that’s only part of the case with C15:0. The story begins in San Diego Bay with the US Navy’s marine mammal program. In the early 2010s, Dr. Stephanie Venn-Watson, a veterinary epidemiologist and entrepreneur, worked with a team of scientists to help continually improve the health of aging dolphins. In particular, the team wanted to understand why some of these marine mammals developed age-related conditions while others did not.

“In caring for older Navy dolphins, we found that about 1 in 3 dolphins developed aging-related diseases similar to those in humans, including insulin resistance, anemia, high cholesterol, fatty liver, and chronic inflammation,” explained Venn-Watson, who has previously worked with the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO). Discover.

With funding from the Office of Naval Research, Venn-Watson and colleagues applied metabolomics – the in-depth study of small molecules involved in cellular processes, used in disease diagnosis and drug discovery – to see which small molecules in the dolphins’ all-fish diet and in their blood serum predicted the healthiest individuals. It was here that they made their first discoveries.

“That’s when we first discovered that higher dietary and circulating levels of C15:0, an odd-chain dietary saturated fat, predicted healthier aging in dolphins,” Venn-Watson added.

The team then fed the dolphins a modified fish-based diet containing higher levels of C15:0, which led to improved health. This even completely relieved anemia in all affected dolphins within three months. Through further research, they were able to show that C15:0 not only reduces the risk of developing chronic diseases associated with aging, but it can also reverse them.

“Based on a decade of Navy-funded research demonstrating that C15:0 is an active and beneficial nutrient for dolphins and humans, we developed Fatty15 to provide a pure, bioavailable C15:0 supplement that could protect our long-term health and promote healthy aging for all,” Venn-Watson explained.

“Wonderfully, in the last decade since our initial discovery, more than 100 peer-reviewed studies have been published by independent teams contributing to the totality of the evidence – reconfirming and expanding on C15:0 as a foundational nutrient. Just as importantly, no peer-reviewed study has shown that C15:0 is not a foundational nutrient.”

Advantages of C15:0

The last essential fatty acids discovered were omega-3s in 1929. These essential polyunsaturated fats are essential for maintaining a healthy heart, brain, eyes and joints. Like its “distant cousin” – they belong to the same large family of fatty acids but have distinct functions in the body – C15:0 appears to offer a range of health benefits, including improved metabolism, liver, red blood cell and cholesterol health. It may also promote healthier joints, better sleep, and an even calmer mood.

In vitro and cellular studies have also shown that C15:0 improves mitochondrial function in cells by 45%, which may contribute to overall cognitive and physical performance. Additionally, C15:0’s ability to strengthen cell membranes may also help prevent “cellular fragility syndrome,” a nutritional deficiency syndrome recently proposed by Venn-Watson, which can lead to lipid peroxidation, a complex chemical process that leads to oxidative breakdown of lipids, resulting in cell death. Scientists at Columbia University called this new form of cell death “ferroptosis.”

“[S]Studies support that if we don’t have enough C15:0 in our cell membranes, they can become fragile and susceptible to ferroptosis. In turn, ferroptosis is known to accelerate aging and the onset of multiple aging-related conditions, including type 2 diabetes, heart disease, liver disease, and cognitive decline. Simply put, C15:0 deficiency accelerates the general aging process,” added Venn-Watson.

“Given our population-wide decline in dietary C15:0 intake due to decreased consumption of dairy fat (our primary source of C15:0), this concept of deficiency syndrome has received increased attention.”

Recover saturated fats

In January 2026, the U.S. Department of Agriculture released its new Dietary Guidelines for Americans, which, for the first time in 50 years, reversed its stance on full-fat dairy products. For decades, Americans have been asked to reduce their intake of dietary saturated fat, primarily by avoiding dairy fat. However, more and more research has shown that not all saturated fats are the same; some are harmful, like even-chain saturated fats like C16:0 (found in red meat), but others are essential for a healthy body, like C15:0.

While dolphins get their C15:0 from certain types of fish, our main dietary source of C15:0 is dairy fat. Studies suggest that there are several ways to increase your C15:0 levels. First, you can choose higher quality dairy products, like full-fat cheeses, especially those from grass-fed animals. Second, you can increase your fiber intake, as this can help your gut microbes produce more C15:0. And you can also try C15:0 supplements, which have been shown to be an effective way to optimize levels of this nutrient.

These supplements, like Fatty15’s original capsules or their new gummies for adults, could be a great way to improve your resilience to the effects of aging.

If you would like to learn more about the history of C15:0, click here.

The content of this article is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of qualified health providers with any questions you may have regarding medical conditions.

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