Yea I have heard those same issues. I don't see much with supplements to be honest unless they are pure organic ones. You can get supplements that are plant based and basically herbs. These are much more powerful and potent because they are coming from living things. It is essentially like food. My vegans friends rave about them but they can be costly. In the end, getting everything I can from food is my main goal. If I am lacking in something, I will hit some supplements up. Mood, energy, and productivity comes mostly from mindset in my opinion. But if the diet is terrible then that will affect you in some ways for sure.