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Fatty15 is a single-ingredient supplement built around pentadecanoic acid (C15:0), a saturated fatty acid found mainly in dairy fat that the body cannot make efficiently on its own. Each vegan capsule delivers 100 mg of C15:0, and this kit holds three 30-capsule bottles for a 90-day supply at one capsule a day. It is marketed for cell membrane and mitochondrial support, with energy, mental clarity and sleep as the top stated uses. The best new price is $36.05 at eBay as of November 8, 2026, the low end of what the six stores listing it new charge.
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Lowest price we've seen: $36.05 on Nov 8 at eBay. Tracked across 5 stores since Nov 8.
Users who stick with it describe steadier energy and easier sleep, while skeptics question the price and the strength of the evidence.
Pentadecanoic acid, known as C15:0, is a fatty acid your body needs but can't manufacture well on its own. Endurance training puts steady mechanical and oxidative stress on the same cell membranes this fatty acid helps reinforce, and most athletes have never heard of it.
Fatty15 delivers a single, third-party tested dose of the essential fatty acid C15:0 to support cell membrane and mitochondrial health during heavy training.
One Pure Ingredient – Fatty15 contains a single active ingredient, pure pentadecanoic acid, inside a plant-based capsule. There's nothing else in the formula to interact with the rest of your stack or complicate a nutrition plan already built around protein, electrolytes, and recovery work.
Cell Membrane Support for Heavy Training – C15:0 is a structural fatty acid that helps reinforce cell membranes, the same membranes that take a beating from repeated hard efforts, heat exposure, and oxidative stress. Most recovery supplements chase inflammation after a hard session. This one works on the membrane itself.
A Different Angle on Cellular Health – Most recovery supplements target inflammation after the fact. C15:0 supports the structural integrity of the cell membrane itself, a different mechanism than antioxidants or omega-3s.
C15:0 engages pathways your body already uses to manage energy and repair, including AMPK, which helps regulate how cells produce and use energy, and mTOR, a pathway tied to cell growth and repair. Early research also links higher C15:0 blood levels to metabolic and cardiovascular markers that sit within a normal, healthy range, though most of that work is observational, pointing to an association rather than proof that a capsule moves those numbers on its own.
The better-established piece is structural. C15:0 helps stabilize the fatty layer in your cell membranes, which matters most to anyone putting consistent stress on those cells through training.
How to Use Fatty15
Dose: Take 1 to 2 capsules daily, with or without food. Most people start with one capsule and move to two once they know how their body responds. Take it at the same time each day and give it several weeks before you judge how you feel.
