Next-generation multivitamin in vegetarian capsules? Essential nutrition for optimal health with an organic vegetable/fruit blend Douglas Laboratories? is proud to announce that Ultra Preventive? X capsules contains Metafolin? a patented, natural form of (6S) 5-methyltetrahydrofolate (5-MTHF), 1,000 IU of vitamin D3 per serving and an organic fruit and vegetable blend. Ultra Preventive? X vegetarian capsules may be a useful dietary supplement for those who wish to consume the essential nutrients for health.