Get as much as you can from foods, especially green leafy vegetables and fruits.
Over supplementation can present many dangers, especially because these dangers are not yet fully understood:
http://deannalynnsletten.suite101.com/dangers-of-vitamin-and-mineral-overload-a167164
Pay the greatest atention to the manufacturer:
As a rule of thumb:
—you can skip all supplements a day a week
—you can use supplements in alternate days (say odd days and even days like May 1
and May 2)
----do understand the RDA (recommended daily allowance) for each supplement.
Even healthy foods present dangers in excess. Eg cosuming too much carrots will make your face white and your kidneys sick.
It looks like the best manufacturer is Thorne Research.
Probably the greatest danger is ignorance. Educate yourself.