1:5 – 60%. Hawthorn is a cardiac tonic for all types of heart conditions; it protects collagen fibers, and reduces cortisol. A study commissioned by the German Ministry of Health found that hawthorn improves contractions in the heart muscle while in turn dilating the heart. Useful with bartonella by offering blood vessel repair (especially when combined with Japanese Knotweed). Dosage: up to 1 teaspoon 3x day.