Cortney L.
SCAM BEWARE
SCAM BEWARE. The company refused to honor their refund policy even though I never opened their product and was willing to send it back to them. They are a SCAM!!! Do not buy this product.
Fatty15 is a science-backed healthy aging supplement featuring pure C15:0, a unique odd-chain saturated fatty acid that is emerging as the first essential fatty acid discovered in more than 90 years. C15:0 is a foundational nutrient that helps support stronger, more resilient cells, healthy mitochondrial function, and whole-body health as we age.Developed by Seraphina Therapeutics, Fatty15 was born from more than a decade of research into C15:0 and its role in human health. Today, Fatty15 makes this important nutrient simple to incorporate into a daily wellness routine—with pure, patented C15:0 backed by 150+ peer-reviewed studies and rigorous quality standards.At its core, Fatty15 is about giving your cells the nutritional support they need to stay strong, resilient, and healthy—helping you feel your best today while investing in healthier aging for the years ahead.
fatty15.com (fatty15.com) has 42 customer reviews on Five Star Index, with an average rating of 3.1 out of 5.
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Personal Care · Orlando, Florida
Excellent

Personal Care · Grants Pass, Oregon
Excellent

Personal Care · Great Neck, NY
Excellent

Personal Care · Costa Mesa, California
Excellent
42 approved reviews, newest moderated first
Cortney L.
SCAM BEWARE. The company refused to honor their refund policy even though I never opened their product and was willing to send it back to them. They are a SCAM!!! Do not buy this product.
James S.
Expensive scam.
Response from fatty15.comOct 21, 2026
Hi James, We’re sorry to hear you feel this way. We’d appreciate the opportunity to better understand your experience. Please reach out to our Nerdy Do-Gooder team if we can be of assistance. In Health, Your fatty15 Team
Nanette
I have been taking fatty15 for several years and have noticed positive changes in my health, both in the short and long term! I had progressively worsening arthritis in my shoulders & knees, which I had attributed to “being in my 50s”. A few months after taking fatty15 daily, I regained pain-free, full range of motion in those joints. Nothing else in my daily routine had changed during that time, so I believe that fatty15 was the reason for the improvement. Additionally, about two years after taking fatty15, I noticed that I was no longer allergic to cats, Again, I had not made any changes in my life over those years that would explain the lack of immediate allergic reactions that I had to cats for as long as I can remember. I was a scientific researcher for 20 years, so I am very skeptical about supplements in general but I believe in fatty15 - and I had no expectations of the improvements I have experienced! If these two very different effects on my health seem unbelievable, please check out the company’s website (or read The Longevity Nutrient) to discover the incredible volume of science that supports adding fatty15 to your life!
Li S.
I’m 80 years old and have been taking fatty15 for a little while now. I try to stay on top of my health, and I liked that this was something simple I could add to my routine. It’s just one small capsule a day, which makes it easy to remember. I’ve had a good experience with it so far and also like knowing there is research behind the product. Ordering has been easy and my shipments have always arrived without any problems. I’m happy with fatty15 and plan to keep taking it.
Emme H.
I have been taking fatty15 for almost 3 months now and I have noticed a big change in my sleep and energy! I sleep through the whole night and no longer crash in the afternoon. Love fatty15!
Katie
Fatty15 has been excellent! They have provided top notch customer service when managing my subscription and answering detailed in depth product questions. Their team is all very well versed in the science behind the product and the brand continues to keep us educated with the latest research and science behind C15:0 in their weekly emails. I've felt improvements in my health since starting fatty15 and recommend to all my friends now!
Molly S.
The customer service team is so nice here! If I didn’t already love the product, knowing that they have a smart, empathetic team that is reachable by phone and email is a game changer. When I called recently, I didn’t have to wait long to get assistance. Every other company you call and wait forever to talk to someone. Thanks fatty15!
Marcelino G.
I’m obsessed with health data, and checking my Whoop is the very first thing I do every morning. After about 9 weeks on fatty15—with zero other changes to my daily routine—my sleep consistently climbed over the 7-hour mark for the first time (historically I was closer to 6 hours). On top of that, my Whoop showed my pace of aging decreased by a full year. Fatty15 was the only variable I changed, and it completely lives up to the claims. Highly recommend!