I suppose it's up to your interpretation whether taking Safflower oil is more or less effective then CLA. I've used this in the past,
In the study, the effects of taking conjugated linoleic acid (CLA, an agent promoted for weight loss) and safflower oil over two 16-week periods were compared. By trial?s end, the researchers found that subjects taking safflower oil experienced a significant loss of abdominal fat compared with those using CLA. Problems with the study begin with the small number of participants (55) and the number who dropped out (20). All the people involved were postmenopausal women with type II diabetes, begging the question of what the effects might be in men or younger women. Adverse effects occurred but were not specified. In addition, safflower oil was compared to CLA, an agent that has been reported to increase insulin resistance ? the comparison may thus not be fair from the get-go.