Hello, I'm a writer working on a health and wellness article exploring the best beetroot supplements. I'm seeking insights from board-certified cardiologists, registered dietitians, or clinical nutritionists with experience in cardiovascular health and supplementation. I'd love expert commentary on whether beetroot supplements effectively support blood pressure, circulation, and exercise performance, which compounds like dietary nitrates and betalains have the strongest clinical evidence, any safety concerns or medication interactions especially for those on blood pressure medications, and what consumers should prioritize in terms of dosage, third-party testing, and ingredient quality when choosing a beetroot supplement. Your evidence-based insights would be greatly appreciated for inclusion in this feature. Warm regards, Samuel Oluwoyo