A Vogel Passiflora Complex Drops (50ml). Combination of fresh herb tinctures of passiflora and oat herb. Passiflora Complex is a herbal tincture containing Passiflora incarnata and Avena sativa. It is a food supplement which is particularly useful for supporting those prone to worrying or feeling ‘under pressure’, helping to maintain a healthy response to stress. Passion Flower Drops.. Only freshly harvested, organically grown Passiflora and Avena sativa herbs are used to produce Passiflora Complex tincture.