Yeast energizer

Do you ever use it? When do you use it? And how does it work?

I have some and never have.

I throw a little of NB’s yeast nutrient in all my batches and starters. It has both nitrogen and some micronutrients that yeast need. If your energizer is only DAP, I think wort probably has enough nitrogen unless theres a lot of wheat or other adjuncts.