If you care about healthy, especially healthy for the environment, I wouldn't use weed n feed:
https://eartheasy.com/blog/2010/06/6-rea ... your-lawn/
from the article:
Marketed under many different brand names, these chemically-based herbicides are some of the most toxic substances which are still legal to buy. (In Canada, all weed â€˜n feed pesticide and fertilizer combination products have recently been banned.)
Short-term effectiveness is gained at the expense of long-term lawn and soil health. The overpowered chemical fertilizers these products contain actually weaken turfâ€”causing the kind of fast, weak, unnatural growth thatâ€™s susceptible to pests and disease.
Perhaps you need to re-think the notion that everyone needs to have golf-course quality lawns at home. I don't do anything to my lawn, certainly no chemicals and little of anything else. It has a lot of weeds in it. But kept mowed it all looks even and green. Some of the weeds are clover, which is a nitrogen fixer and the clover flowers are good for bees and other beneficial insects.