We look for natural ways to keep the Omega oil blend from oxidizing and going rancid. Rosemary extract is a very good natural antioxidant, and it is not additive 300 (ascorbic acid) nor additive 321 (BHT). It is simply an extract of rosemary, approved for use in Australia.
Omega is also an approved complimentary medicine listed in the Australian Register of Therapeutic Goods - Omega Blend AUST L 288199.
Below is attached the approval report as part of the AU/NZ Food Standards Code.