All EFA's are an essential part of any diet, cutting or bulking or just maintaining. the key to weight loss is proper diet and training.

EFA's are needed to allow the body to function properly. With out these fats you could impair your body's optimal fat burning. But alone flaxoil will not make you loose weight. Just as Arthjen said diet and training are essential.

Flaxseed oil can aid in fatloss when dieting, but only because it will allow you to reduce carbs to a certain degree and still meet you daily calorie requirements.