50% of Americans are thought to be magnesium deficient, yet only 5% of meat eaters. This is put down to over-farming of the land without re-fortifying the soils trace minerals. (Which is the GMO vs organic debate) similar can be said for potassium.
99% of Pesticides in the American diet are produced by plants to defend themselves against an animal attack. Only 52 of these have been tested in animal cancer cases and about half (27), have shown to be rodent carcinogens. All 27 natural pesticides are found in common foods in minor doses. (Repeat exposure and accumulation being put to blame).
Again on the other hand, as you can find anti-nutrients, endocrine & Immune disrupters in plants you will also find Antioxidants, Flavonoids and other Phytonutrients which are said to benefit certain conditions
To wrap it up;
There are Pros and Cons to every scenario, what’s right for your situation?
That being said I would suggest vegans supplement with VitD3, Omega3, a Multi-strain Probiotic and B complex vitamins.
Omnivores supplement with added rock salts or electrolytes, multi-strain probiotic and phytonutrients.
The argument could be made in each case the quality of food ingredients mattered more than vegan Vs meat consumption.
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To put it simply, nootropics are supplements designed with the intent of boosting brain power while maintaining brain health. Some refer to nootropics as “smart drugs” or the kind of pill that the protagonist in the film Limitless took that allowed him to maximise brain power and more. 
The truth of the matter is, nootropics are simply formulations that contain specific ingredients or concentrations of compounds that have been studied for their brain benefits. Most of the formulas you find in popular nootropics contain natural ingredients