Menadione is a synthetic vitamin K precursor. As opposed to napthoquinone, which would be a naturally occurring precursor molecule. The nicotinamide is otherwise known as niacin or vitamin B3, not a problem molecule in the mix.
Here is an abstract which talks about nicotinamide being problematic for weight gain as opposed to a similar formulation where nicotinamide was replaced by dimethyl-pyrimidinol.
Nothing else on the label arouses my chemist curiosity.
You know why they have these feed additives in the layer pellets -- because a soy+corn mix is insufficient for the health of the chicken. So they go to the chemical shelf and add whatever is missing. If your chickens have access to kale and the slugs and bugs that live on the kale, then you don't need these additives. Kale contains all the vitamin K the chooks would ever need, and a tasty grasshopper or slug will have lots of niacin.
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P.S. If you just supplement the winter feed with cabbage/sauerkraut/silage, it will cover a lot of these vitamin issues.