Is pure green coffee bean extract safe to take?

Not known how safe: Green coffee bean extracts have caffeine, which is a stimulant, depending on how much caffeine one takes, and on how sensitive his body is to caffeine. There are other plant chemicals as well. Most likely, green coffee is not well regulated nor well studied, so it may contain uncertain amounts of listed ingredients, plus various amounts of unlisted ingredients. One cannot be sure of its effects.

Do not waste your $: Do not waste your time with "weight loss supplements". Green coffee beans are just the latest in a long line of overhyped fads. If you want to achieve weight loss, reduce your carbs to a bare minimum, drink only water, eat lots of low starch veggies and increase your activity levels.