While it is typically better to get our nutrients from food, food-based C15:0 has several big limitations. First, some studies have shown that eating fish and other high-fat foods can actually decrease our circulating C15:0 levels. Second, foods that contain the good, odd-chain C15:0 saturated fatty acid also contain much higher levels of proinflammatory, even-chain C16:0 saturated fats. Third, C15:0 in foods are bound to complex lipids called triacylglycerides, which are not absorbable (our bodies have to use digestive enzymes to break C15:0 down into bioavailable free fatty acids). For these reasons, fatty15's founders of doctors and scientists spent years developing a pure, vegan-friendly C15:0 ingredient that successfully raises our C15:0 levels by providing just the good C15:0 fat in a highly bioavailable free fatty acid form. This is the only ingredient in fatty15.