My “Best By” date was 2 days ago. It the product still OK to consume? Or do I need to throw it out.

Yes, it is still safe to consume in the refrigerator for up to 61 days; however, it begins converting into probiotics when the cells break, releasing the blue liquid near the use-by fresh date on the jar lid.

As long as the Spirulina in the jar is still green or dark green and there are no signs of blue or purple liquid in the jar or wetness of the Spirulina, that’s a good sign; the cells are still whole, and the cell membrane protects nutrients.