Final answer:
The functional food that has been identified as having a qualified health claim for essential and gestational hypertension is calcium supplement.
Step-by-step explanation:
The functional food that has been identified as having a qualified health claim for essential and gestational hypertension is calcium supplement. According to research, an adequate intake of calcium has been shown to have a favorable effect on blood pressure control and may reduce the risk of hypertension.
Multiple studies have highlighted the association between dietary minerals like calcium, potassium, and magnesium, and their positive effects on blood pressure regulation.
For example, the Dietary Approaches to Stop Hypertension (DASH) diet, which includes magnesium, calcium, and potassium-rich foods, has been found to be effective in blood pressure control.