Fatty 15 is a popular dietary supplement featuring pure C15:0 (pentadecanoic acid). It is marketed as a breakthrough essential fatty acid that strengthens cell membranes, supports metabolic and liver health, and improves sleep and energy levels.
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.