The Potential Ozonide Index (POI) shows how much ozone a particular oil can hold. The more Omega 3s, 6s and 9s an oil has, the more ozone it can infuse and the stronger it is. The formula goes like this: Omega 3s (x3) Omega 6s (x2) Omega 9s (x1) = POI.
Castor has a final POI of 35.