How can you lower your blood pressure immediately? 1. Take a warm bath or shower. Stay in your shower or bath for at least 15 minutes and enjoy the warm water. 2. Do a breathing exercise. Take a deep breath from your core, hold your breath for about two seconds, then slowly exhale. 3. Relax! What herbal supplement is good for high blood pressure? Herbal supplements may be beneficial as alternative hypertension treatments: - Hawthorn - Fish oil - Garlic - Magnesium - Coenzyme Q10 - Folic acid