Walnuts
Walnuts contain so many vital compounds, which include L-Arginine, alpha-lipoic acid (ALA) and vitamin E. They are all used to stimulate the production of nitric oxide.
Consuming walnuts may reduce blood pressure, boost blood vessel function and decrease inflammation, especially in people with diabetes.
People with diabetes [5] often have circulation problems and high blood pressure due to blood vessel damage caused by unregulated blood sugar levels.
Tomatoes
Tomatoes are used to reduce the activity of Angiotensin-Converting Enzyme (ACE), [6] which causes constriction of blood vessels to regulate blood pressure.
Research reveals that tomato extracts have the same functions as ACE-inhibiting drugs which are opening up your blood vessels and boosting blood flow.
Conclusion
There are other natural ways to boost circulation, including choosing foods that stimulate blood flow. It is also important to live a healthy lifestyle.
Reference:
[1] https://www.verywellhealth.com/the-benefits-of-allicin-88606
[2] https://ods.od.nih.gov/factsheets/Omega3FattyAcids-Consumer/
[3] https://www.webmd.com/diet/healthy-foods-nitric-oxide
[4] https://www.nhs.uk/conditions/stroke/
[5] https://www.diabetes.org.uk/
[6] https://www.mayoclinic.org/diseases-conditions/high-blood-pressure/in-depth/ace-inhibitors/art-20047480