Fatty 15 is a popular dietary supplement featuring pure C15:0 (pentadecanoic acid).
The proposal that C15:0 is an essential fatty acid is the manufacturer’s hypothesis.
It is marketed as a breakthrough essential fatty acid that strengthens cell membranes, supports metabolic and liver health, and improves sleep and energy levels.
Fatty15 (pure pentadecanoic acid, C15:0, sold as FA15) has no proven clinical benefits in humans.
The evidence required for health as only associative.
The proposed target intake of 200–300 mg/day comes from those preclinical data, not from outcome trials.
The evidence comes mostly from observational associations, cell and animal studies (largely funded by the manufacturer), and two small, short RCTs.
Those trials showed that the supplement raises blood C15:0 levels and produced at most modest changes in biomarkers.
No trial has shown that it reduces disease or mortality.
C15:0 is an odd-chain saturated fatty acid naturally found in trace amounts in whole-fat dairy and some fish and meat.
Fatty15 is a daily dietary supplement that features pure pentadecanoic acid (C15:0), a saturated fatty acid originally discovered in dairy and the diets of healthy marine animals.
Fatty15 is a supplement containing C15:0 (pentadecanoic acid), the first essential fatty acid discovered in 90 years.
Claims are that increasing this fatty acid can reverse the “Cellular Fragility Syndrome,” leading to stronger cells and improved mitochondrial function.
It may make. red blood cell membranes stronger and help modulate inflammatory responses.
It is marketed as a cellular health and longevity compound designed to strengthen cell membranes and improve metabolic, liver, and cognitive function.
Supports cellular health, deeper sleep, balanced mood, joint comfort, and liver/metabolic function.
It is an alternative to fish oil/omega-3s, as well as vegans or dairy-free individuals who miss out on natural dietary sources of C15:0.
Linked to a decreased risk of cardiovascular disease, type 2 diabetes, and liver-related complications.
Users often report deeper sleep, less fatigue, and improved moods.
To get C15:0 naturally consuming whole-fat dairy (like cheese or whole milk) and certain meats, though these foods come with other types of saturated fats and calories.
For those who avoid dairy or animal products, Fatty15 provides a clean, vegan, and calorie-controlled way to supplement this specific fatty acid.
Dolphins live longer, and healthier lives with higher levels of C15:0, which led to exploring its benefits in humans.
Each capsule delivers 100 mg of pure, patented C15:0 in a vegetable cellulose capsule, making it vegan-friendly.
Claimed benefits: it supports cognitive health, deeper sleep, and metabolic health by activating AMPK and AKT pathways and repairing mitochondria.
Higher blood levels of C15:0 are consistently associated with better cardiometabolic markers, but supplement trials so far show modest, pathway-specific benefits rather than dramatic effects on weight loss or longevity.
C15:0 acts as a prebiotic supporting a healthy gut microbiome.
C15:0 has shown promise in cell-based studies — performing comparably to longevity drugs like metformin and rapamycin.
More clinical trials are needed to understand long-term effects in humans.
Higher circulating 15:0 is linked to lower risk of type 2 diabetes.
It is also linked to lower CVD risk: RR 0.88 for highest vs lowest fertile across 18 studies, with no association with all-cause mortality.
An earlier meta-analysis found no significant CVD association.
PPARα/δ agonism, AMPK activation, and anti-inflammatory and antifibrotic effects in cell systems.
Mouse models of obesity and NASH showed lower glucose, lipids, and liver fibrosis.
Fatty15 appears well tolerated over 12 weeks.
However, the evidence does not support recommending it for prevention or treatment of any condition.
For patients interested in it, effects of the dairy food matrix are a plausible alternative explanation for the epidemiology.