Hi. You might want to google Hawthorne, and Cayenne.
www.webmd.com/vitamins-supplements/ingredientmono-527-hawthorn.aspx?activeingredientid=527
It seems that this effect is due to a component in hawthorn called proanthocyanidin. Food sources of proanthocyanidins: beetroot, grapes (seeds and skins), apples, unsweetened baking chocolate, red wines, blueberries, cranberries, bilberries, black currants, hazelnuts, pecans, pistachios. The highest concentrations of proanthocyanidins in fruits known to date were detected in black chokeberries. Probably everything purple, to be fair.
About cayenne pepper:
www.naturalnews.com/030039_high_blood_pressure_prevention.html
Obviously you must be very careful. I have high BP, and could not readily take the cayenne, it was too indigestible. Have not yet tried the hawthorne. BP started post meno-pause, and I have lost some weight (could do with losing more), exercised, gave up salt, etc but had to take the drugs in the end. My GP Suggested that it is a family tendency.
A qualified medical herbalist should be able to guide you through using these herbs.