Maybe that's why we don't see bags of apple seeds being sold next to sunflower seeds in grocery stores, but there's no way you'd be able to eat enough whole apples to poison yourself with those seeds. The supposed toxicity of apple seeds is greatly exaggerated. Yes, they contain a compound that is metabolized into cyanide. But so do many seeds and nuts, and our bodies are evolved to deal with it. The half-life of cyanide in your body is about an hour, it gets metabolized and doesn't accumulate in you. You'll never feel the effects of the cyanide even if you eat several apples a day.