High Blood Pressure (Hypertension)

High Blood Pressure (Hypertension)

Grade B is where the mineral evidence sits. Magnesium carries the widest study base of any ingredient here, 34 studies across 2,028 participants, followed by potassium at 22 studies and 1,600 participants. Their actions are physiologically related: both influence vascular smooth-muscle tone and renal sodium handling, and both are commonly under-consumed in the same processed-food diets that supply the excess sodium listed first among the risk factors. The other Grade B entries are polyphenols and lipids rather than minerals, with quercetin at 17 studies, grape seed extract at 16, coenzyme Q10 at 12, flaxseed oil at 11, resveratrol at 10, taurine at 7, lycopene at 6, and olive leaf extract at 5.

Direction of effect is not uniform. Seventeen of the nineteen ingredients are recorded as positive, but vitamin D and calcium are both Grade C with a mixed direction, and vitamin D alone accounts for 30,000 of the 44,288 participants in the entire set. The imbalance is instructive: the largest trials in this collection are the ones that failed to show a consistent effect. One such trial, which randomised vitamin D and marine omega-3 fatty acids in adults without established cardiovascular disease, was designed around exactly that problem of detecting a small effect in a well-nourished population ^[1].

Cocoa flavanols occupy a comparable position at Grade C on 20 studies and 1,000 participants, with reasonably consistent short-term vascular readouts and less consistent evidence for sustained pressure change. L-citrulline, berberine, nattokinase and hawthorn are each graded C on four to eight studies, a base too narrow to separate a genuine effect from small-trial noise.

Botanical preparations warrant particular caution in this condition, because the people taking them overlap heavily with the people taking antihypertensive drugs. Pharmacy reviews of herbal products have catalogued the interactions and safety concerns that arise from that overlap ^[2]. Blood pressure also responds to factors no ingredient addresses: sodium intake, body weight, physical inactivity, alcohol, and untreated sleep apnea all appear among the established risk factors, and each rests on a larger evidence base than any supplement on this page.