Naturally Fresh is an all-natural clear hummingbird nectar that stays fresh in your feeder, without the use of artificial preservatives. It contains Nectar Defender, a micronutrient that keep the nectar fresh, and is already consumed by hummingbirds in their natural diet of flower nectar and insects, and approved by university scientists and avian experts. Naturally Fresh stays fresh in the feeder for weeks instead of days. Once you try it, you will never want to feed hummingbirds without it.