This invention relates to antioxidants and combinations of antioxidants used to prevent oxidation of pharmaceutical and nutraceutical products in the form of powders, granulates, tablets, emulsions, gels and the like comprising one or more fatty acids and/or fatty acid derivatives and, optionally, at least one carbohydrate carrier alone or together with vitamins, minerals and/or pharmaceuticals. In particular, the invention concerns the use of antioxidants to reduce oxidation of powders, tablets, gels and emulsions comprising high concentrations and high doses of omega-3 fatty acids or derivatives thereof.