Chemical composition and medicinal properties of hemlock tincture Due to its chemical composition, hemlock has unique medicinal properties. The plant - based tincture includes the following chemical elements: Koniin is a toxin that has a nerve-paralytic effect. Toxic elements and alkaloids are mainly concentrated in the seeds of the plant. Vitamins of group A, C, R. Essential oils are elements with an oily consistency, having a strong taste and smell. Flavonoids are substances identical to human hormones. Caffeic acid is an element with an anti–carcinogenic effect and anti-inflammatory effect, as well as helping to strengthen the immune system.