How to verify the authenticity of Sanjiuxin dha seaweed oil

The quickest way to identify the quality of dha is to put it in the refrigerator for quick freezing. If it becomes hard or discolored, the quality is impure. The freezing point of dha is MINUS 50 degrees. You can smell it, too If there is a strong fishy smell, it may be mixed with fish oil or stale fish oil or seaweed oil. If you smell fresh seaweed or seaweed, it is relatively pure dha seaweed oil.