Supplements for blood pressure

15 compounds relevant to blood pressure, ranked by overall evidence grade.

Overall grade: Grade B
Last revised: Jul 10, 2026; 15
graded outcomes: 0
references listed

Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.

7 at grade B · 8 at grade C — 15 graded rows

What is known

Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.

Outcome	Grade	Effect size	Agreement
MagnesiumA cofactor in 300+ reactions that a large fraction of adults under-consume — real, modest benefits for sleep, blood pressure, and migraine.	Evidence grade B	Unclear	mixed
PotassiumMost people eat too little and too much sodium — shifting the ratio lowers blood pressure.	Evidence grade B	Unclear	mixed
L-CitrullineThe arginine route that actually absorbs — a legitimate pump-and-reps pre-workout with modest blood-pressure benefit.	Evidence grade B	Unclear	mixed
GarlicReal, modest blood-pressure lowering and small lipid effects — a legitimately useful kitchen cardiovascular supplement.	Evidence grade B	Unclear	mixed
Beetroot / Dietary NitrateDietary nitrate lowers the oxygen cost of exercise — a legit endurance aid, best in recreational athletes.	Evidence grade B	Unclear	mixed
Cocoa FlavanolsThe flavanols in cocoa genuinely improve blood-vessel function and modestly lower blood pressure — the sugar is the catch.	Evidence grade B	Unclear	mixed
HibiscusHibiscus tea reliably lowers blood pressure a few points — one of the better food-based options.	Evidence grade B	Unclear	mixed
TaurineA conditionally-essential amino acid with broad but mostly modest effects on exercise, blood pressure, and metabolic markers.	Evidence grade C	Unclear	mixed
QuercetinA flavonoid with modest blood-pressure data, a senolytic research role, and poor absorption to overcome.	Evidence grade C	Unclear	mixed
L-ArginineThe direct nitric-oxide precursor that mostly loses to citrulline because the gut destroys it first.	Evidence grade C	Unclear	mixed
Olive Leaf ExtractAn oleuropein-rich extract with modest blood-pressure data and antioxidant claims.	Evidence grade C	Unclear	mixed
Pycnogenol (Pine Bark)A pine-bark polyphenol with broad small-trial signals for circulation, blood pressure, and skin — much of it single-source.	Evidence grade C	Unclear	mixed
Grape Seed ExtractA procyanidin extract with modest blood-pressure and edema data.	Evidence grade C	Unclear	mixed
NattokinaseA fermented-soy enzyme with fibrinolytic activity and modest blood-pressure data — real mechanism, a bleeding caution.	Evidence grade C	Unclear	mixed
Black Seed Oil (Nigella sativa)A traditional 'cure-all' seed oil (thymoquinone) with real, modest signals for blood pressure, glucose and lipids.	Evidence grade C	Unclear	mixed

MagnesiumEvidence grade B
A cofactor in 300+ reactions that a large fraction of adults under-consume — real, modest benefits for sleep, blood pressure, and migraine.
Unclearmixed
PotassiumEvidence grade B
Most people eat too little and too much sodium — shifting the ratio lowers blood pressure.
Unclearmixed
L-CitrullineEvidence grade B
The arginine route that actually absorbs — a legitimate pump-and-reps pre-workout with modest blood-pressure benefit.
Unclearmixed
GarlicEvidence grade B
Real, modest blood-pressure lowering and small lipid effects — a legitimately useful kitchen cardiovascular supplement.
Unclearmixed
Beetroot / Dietary NitrateEvidence grade B
Dietary nitrate lowers the oxygen cost of exercise — a legit endurance aid, best in recreational athletes.
Unclearmixed
Cocoa FlavanolsEvidence grade B
The flavanols in cocoa genuinely improve blood-vessel function and modestly lower blood pressure — the sugar is the catch.
Unclearmixed
HibiscusEvidence grade B
Hibiscus tea reliably lowers blood pressure a few points — one of the better food-based options.
Unclearmixed
TaurineEvidence grade C
A conditionally-essential amino acid with broad but mostly modest effects on exercise, blood pressure, and metabolic markers.
Unclearmixed
QuercetinEvidence grade C
A flavonoid with modest blood-pressure data, a senolytic research role, and poor absorption to overcome.
Unclearmixed
L-ArginineEvidence grade C
The direct nitric-oxide precursor that mostly loses to citrulline because the gut destroys it first.
Unclearmixed
Olive Leaf ExtractEvidence grade C
An oleuropein-rich extract with modest blood-pressure data and antioxidant claims.
Unclearmixed
Pycnogenol (Pine Bark)Evidence grade C
A pine-bark polyphenol with broad small-trial signals for circulation, blood pressure, and skin — much of it single-source.
Unclearmixed
Grape Seed ExtractEvidence grade C
A procyanidin extract with modest blood-pressure and edema data.
Unclearmixed
NattokinaseEvidence grade C
A fermented-soy enzyme with fibrinolytic activity and modest blood-pressure data — real mechanism, a bleeding caution.
Unclearmixed
Black Seed Oil (Nigella sativa)Evidence grade C
A traditional 'cure-all' seed oil (thymoquinone) with real, modest signals for blood pressure, glucose and lipids.
Unclearmixed

What is uncertain

Read off the same rows as above. Nothing here is added that the entry does not itself record.

Thin evidence: Taurine (grade C); Quercetin (grade C); L-Arginine (grade C); Olive Leaf Extract (grade C); Pycnogenol (Pine Bark) (grade C); Grape Seed Extract (grade C); Nattokinase (grade C); Black Seed Oil (Nigella sativa) (grade C).
Studies disagree: Magnesium (mixed agreement); Potassium (mixed agreement); L-Citrulline (mixed agreement); Garlic (mixed agreement); Beetroot / Dietary Nitrate (mixed agreement); Cocoa Flavanols (mixed agreement); Hibiscus (mixed agreement).

The evidence in words

The shortlist

Every compound in the knowledge base tagged to blood pressure, ordered by how strong its overall evidence is. Start at the top; the grade is the honest filter.

Worth considering first

Magnesium (B) — A cofactor in 300+ reactions that a large fraction of adults under-consume — real, modest benefits for sleep, blood pressure, and migraine. · Potassium (B) — Most people eat too little and too much sodium — shifting the ratio lowers blood pressure. · L-Citrulline (B) — The arginine route that actually absorbs — a legitimate pump-and-reps pre-workout with modest blood-pressure benefit. · Garlic (B) — Real, modest blood-pressure lowering and small lipid effects — a legitimately useful kitchen cardiovascular supplement. · Beetroot / Dietary Nitrate (B) — Dietary nitrate lowers the oxygen cost of exercise — a legit endurance aid, best in recreational athletes. · Cocoa Flavanols (B) — The flavanols in cocoa genuinely improve blood-vessel function and modestly lower blood pressure — the sugar is the catch. · Hibiscus (B) — Hibiscus tea reliably lowers blood pressure a few points — one of the better food-based options.

Lower-evidence options

Taurine (C) — A conditionally-essential amino acid with broad but mostly modest effects on exercise, blood pressure, and metabolic markers. · Quercetin (C) — A flavonoid with modest blood-pressure data, a senolytic research role, and poor absorption to overcome. · L-Arginine (C) — The direct nitric-oxide precursor that mostly loses to citrulline because the gut destroys it first. · Olive Leaf Extract (C) — An oleuropein-rich extract with modest blood-pressure data and antioxidant claims. · Pycnogenol (Pine Bark) (C) — A pine-bark polyphenol with broad small-trial signals for circulation, blood pressure, and skin — much of it single-source. · Grape Seed Extract (C) — A procyanidin extract with modest blood-pressure and edema data. · Nattokinase (C) — A fermented-soy enzyme with fibrinolytic activity and modest blood-pressure data — real mechanism, a bleeding caution. · Black Seed Oil (Nigella sativa) (C) — A traditional 'cure-all' seed oil (thymoquinone) with real, modest signals for blood pressure, glucose and lipids.

Goes with

MagnesiumGrade BEvidence grade B
PotassiumGrade BEvidence grade B
L-CitrullineGrade BEvidence grade B
GarlicGrade BEvidence grade B
Beetroot / Dietary NitrateGrade BEvidence grade B
Cocoa FlavanolsGrade BEvidence grade B
HibiscusGrade BEvidence grade B
TaurineGrade CEvidence grade C

Entries that share this one's tags or conditions.

Beetroot / Dietary Nitrate for Blood pressureEvidence grade B — Modest reductionEvidence grade B
Black Seed Oil (Nigella sativa) for Blood pressureEvidence grade C — ModestEvidence grade C
Cocoa Flavanols for Blood pressureEvidence grade B — Modest reductionEvidence grade B
Grape Seed Extract for Blood pressureEvidence grade C — ModestEvidence grade C

Sources

This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.

Last revised Jul 10, 2026. A grade is this entry's reading of the evidence, not medical advice.