Can An “Essential” Fatty Acid Actually Reverse Aging?

Although significant controversies still surround the USDA’s decision to elevate the recommended intake levels of red meat and full-fat dairy, there is a quieter consensus hidden among the noise: experts no longer place all saturated fats in a single, “bad” category. In fact, one fatty acid, pentadecanoic acid (C15:0), may even be an essential nutrient that can help our bodies resist the effects of aging. 

There are several ways you can boost your intake of C15:0 through dietary and lifestyle changes, but you can also enhance it through supplements. And now there is a new supplement, Fatty15’s gummies for adults, that makes it even easier to increase your own intake of this essential fatty acid. 

From aging dolphins to human health

C15:0 is a critical saturated fat that not only improves cell membrane integrity but can also slow aging at the cellular level. Although scientists have known about the compound for a long time, its benefits and potential role as an essential fatty acid were only identified recently.

During the early 2010s, Dr Stephanie Venn-Watson, a veterinary epidemiologist and entrepreneur, worked with a team to continually improve the health of aging US Navy dolphins. More specifically, the team wanted to see why some older dolphins developed age-related conditions while others did not.

“While caring for older Navy dolphins, we found that about 1 in 3 were developing aging-associated conditions similar to humans, including insulin resistance, anemia, hypercholesterolemia, fatty liver disease, and chronic inflammation,” Venn-Watson, who has previously worked with the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO), explained to IFLScience.

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

A decade of Navy-funded research, as well as studies by independent researchers, demonstrated that C15:0 is an active and beneficial nutrient, not only for dolphins but for humans too. This led Venn-Watson and her husband, Dr Eric Venn-Watson, a US Navy Veteran and military physician, to launch Fatty15 with the explicit aim of offering C15:0 as an easily accessible dietary supplement. 

“C15:0 is emerging as a foundational nutrient, which means that it is necessary in our diet to support healthy growth and development during childhood and maintain health throughout our lives,” the couple told IFLScience.

“While our bodies make some amount of C15:0, it doesn’t make enough to achieve and maintain healthy levels (C15:0 > 0.2 percent of total fatty acids). This is in contrast to most fatty acids, which are readily produced by our bodies.”

In addition to evidence of helping improve metabolic, liver, red blood cell, and cholesterol health – as well as promoting improved energy, better sleep, and calmer moods – studies support that C15:0 may also fend off “Cellular Fragility Syndrome”. This deficiency syndrome, which was proposed by Venn-Watson in 2024, may accelerate aging in as many as one in three people.

“Studies support that if we don’t have enough C15:0 in our cell membranes, they can become fragile and susceptible to a new form of cell death called 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,” Venn-Watson explained. 

“Given population-wide declines in our C15:0 dietary intake from decreased intake of dairy fat (our primary source of C15:0), this concept of a deficiency syndrome has gained increased attention.”

Redeeming saturated fats

Prior to the release of the USDA’s new Dietary Guidelines earlier this year, all saturated fats were treated as a dietary pariah. From 1977 onwards, Americans were urged to reduce their intake of saturated fatty acids because larger numbers of men were dying from heart attacks, while there was a significant overall increase in type 2 diabetes and obesity cases in the general population. However, the new guidelines released in 2026 have shifted the USDA’s position.

To be sure, there is still significant controversy here. The Dietary Guidelines for Americans have been criticized for promoting the consumption of animal fats – such as butter and red meat – which are sources of harmful saturated fats. But the decision still represents a distinct move away from viewing all saturated fats as categorically bad for our health. So how can we increase our intake of good fats while avoiding bad ones?

Studies suggest there are a few ways you can achieve this. Firstly, you can choose higher quality dairy products such as whole fat milk and cheese, especially those from grass-fed animals. Secondly, you can increase your fiber intake, which may 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 of optimizing levels of this nutrient. 

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

If you want to find out more about the story of C15:0, click here. 

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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 questions you may have regarding medical conditions.