I’m a Nutritionist—And This Book Totally Sold Me on Fatty15

I’m trained to be skeptical, especially when a new “essential” nutrient starts trending. But after hearing multiple colleagues rave about The Longevity Nutrient—and how it ties directly to the science behind the supplement fatty15—I finally picked up a copy. What I learned completely shifted the way I think about healthy aging… and led me straight to adding fatty15 to my routine.

C15:0 (aka pentadecanoic acid) is a saturated fatty acid that most modern diets lack. But here’s the wild part: it’s now considered essential for human health, meaning our bodies need it to function properly, yet we typically don’t get enough. As a nutritionist, that stopped me in my tracks.

Let’s talk about C15:0 – and why you’re probably not getting enough.

In school, we learn a lot about fatty acids—omega-3s, omega-6s, saturated vs. unsaturated fats… You know the drill. But C15:0? That one never came up.

The Longevity Nutrient lays out why that needs to change. Backed by extensive peer-reviewed research, the book explains how this particular fatty acid plays a much bigger role in our health than previously thought—supporting cellular function, metabolic balance, and even mood regulation.

Unfortunately, thanks to decades of low-fat messaging, most people have cut back on the very foods that naturally contain C15:0—like whole-fat dairy and certain fish—without realizing they were eliminating something critical. That’s where supplementation comes in, and why fatty15, the first and only pure C15:0 supplement, stood out to me.

What the research says (and why I’m sold).

What impressed me most about The Longevity Nutrient wasn’t just how approachable it made the science—it was the credibility and depth behind the research. The studies highlighted in the book make a strong case for C15:0’s essential role in long-term health.

According to multiple peer-reviewed studies, this nutrient can:

• Slow cellular aging by protecting telomeres and reducing DNA damage
• Support metabolic health by lowering cholesterol and stabilizing blood sugar
• Improve mental well-being, including mood, anxiety, and sleep
• Protect the liver from fatty liver disease

From a clinical nutrition perspective, that’s massive. I constantly hear from clients who feel inflamed, fatigued, and foggy—all signs of underlying issues like oxidative stress or blood sugar instability. C15:0 supports many of the systems at the root of those symptoms, which is why it felt like a no-brainer to try fatty15, the supplement form that delivers this nutrient in a pure, easy-to-absorb way.

Why I (Personally) Chose Fatty15

After reading the book, I didn’t just want to understand the science—I wanted to experience the benefits for myself. Fatty15 is the first and only pure, science-backed C15:0 supplement, and it’s vegan-friendly, clean, and free from unnecessary fillers.

I’ve been taking it daily, and I love how low-maintenance it is: just one small capsule, once a day. No fishy aftertaste, no complicated protocols—it just fits effortlessly into my routine.

And because it’s backed by the same researchers leading the charge on C15:0 science, I feel confident recommending it to clients, friends, and anyone serious about aging well from the inside out.

Final Thoughts: Don’t Sleep on This One

Whether you’re in your 30s and thinking more seriously about preventative health, or in your 60s+ and want to feel sharper, stronger, and more resilient—this is one supplement worth looking into.

If you’re the kind of person who likes to understand what you’re taking (instead of just trusting the label), The Longevity Nutrient is a must-read. It’s packed with “aha” moments that shifted how I view nutrition and healthy aging.

Once you’ve read it, I wouldn’t be surprised if you’re reaching for a bottle of fatty15, too.

You can pre-order the book here or head to fatty15.com to learn more about the supplement. Science-backed, easy to take, and genuinely impactful—this one earns a spot on my shelf.