Several supplements have been studied for their potential to lower blood pressure. Here are some of the most notable ones:

1. Vitamin C: There is evidence that vitamin C supplementation can lower blood pressure in both individuals with normal and high blood pressure^1^.

2. Riboflavin (Vitamin B2): Supplemental riboflavin may lower blood pressure in hypertensive individuals, especially those with a particular genetic predisposition^1^.

3. Garlic: Although the evidence is less consistent, some studies suggest that garlic supplements can help reduce blood pressure in people with hypertension^1^.

4. Calcium: While higher dietary intake of calcium is associated with lower blood pressure, calcium supplements have shown only a slight reduction in systolic blood pressure in hypertensive individuals^2^.

5. L-arginine: This amino acid helps relax and open arteries by converting to nitric oxide, potentially lowering blood pressure. However, the effects can vary, and it's important to consult a healthcare provider before use^3^.

6. Magnesium and Potassium: These minerals have shown significant reductions in blood pressure levels. Magnesium can reduce both systolic and diastolic blood pressure, whereas potassium is more significant in reducing systolic blood pressure^4^.

7. Vitamin E: It has been identified to reduce systolic blood pressure to some extent^4^.

Before starting any new supplement, it's essential to discuss it with a healthcare provider, especially if you are taking other medications or have existing health conditions.