Hawthorn and hibiscus are both commonly discussed for heart and circulation support, but they are not interchangeable. Hawthorn deserves extra care because it may affect cardiovascular function and can interact with heart or blood pressure medicines. Hibiscus is often used as a tart tea, but it can still compound blood-pressure-lowering effects for some people.
What to try first
For most people, food-level approaches, home blood pressure tracking, sleep, movement, and clinician-guided medication plans matter more than stacking supplements. If you already take blood pressure or heart medicine, review either herb with a clinician first.
Safety bottom line
Do not stop prescribed medication because an herb seems promising. Seek urgent care for very high blood pressure with chest pain, severe headache, shortness of breath, weakness, confusion, or vision changes.
Start here: High Blood Pressure guide, Hawthorn, and Hibiscus.