The InsideTracker algorithm, B.R.A.I.N (Biomarker Research Analysis Integrative Network), determines optimal zones for each of your individual biomarkers. These optimal zones are personalized based on the latest peer-reviewed scientific research, as well as on your unique demographic and lifestyle information. For example, the generic normal range for a man's level of ferritin, a blood marker for iron, is between 30 and 400 units. However, InsideTracker recommends that a male athlete in his 20s should have a more specific optimal zone of ferritin between 40 and 150 units to achieve optimal performance. Please read our blog post for additional information on this topic.