I was considering taking CLA supplements recently but decided against it after reading Authority Nutrition's take on it.
"
it’s important to keep in mind that the CLA you find in supplements is NOT derived from natural foods.
It is made by chemically altering safflower and sunflower oils, which are unhealthy vegetable oils. The linoleic acid in the oils is turned into conjugated linoleic acid via a chemical process (13).
The balance of the different forms is heavily distorted in supplements. Foods are mostly c9, t11, while the supplements are very high in t10, c12, which is never found in large amounts in nature (14, 15).
For this reason, CLA taken in supplement form does not have the same health effects as CLA gotten from foods."
https://authoritynutrition.com/conjugated-linoleic-acid/