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Dose, and why more is sometimes worse
Potassium lowers blood pressure and also raises it. The dose-response curve is not a slope.
guide
The intuitive model — a little helps, more helps more — is wrong often
enough to be dangerous. Two shapes recur:
The U-curve. For potassium and blood pressure, the relationship runs the wrong way
above a point: in a large analysis the systolic pressure rose above roughly 80 mmol a
day, and the rise was concentrated in people whose hypertension was already being treated
with drugs. Magnesium and potassium both produced their largest systolic effects at
lower doses sustained over longer periods, which is the opposite of the pattern a
supplement buyer assumes.
The threshold. Many actives do nothing below a concentration and are toxic above one,
with a useful window in the middle. This is the whole logic of dilution in aromatherapy:
tea tree oil at full strength on skin is a sensitiser, at the dilution used in the acne
trials it has an effect. And the threshold is not the same in every tissue — a
concentration that is fine on intact skin is not fine on a mucous membrane, and an amount
that is fine swallowed is not fine inhaled.
Three consequences for preparation:
- Record what you made, not just what you took. A tincture's strength depends on the
- Do not concentrate a food-dose remedy into a dose unit without checking. Eating
- A lower dose with evidence beats a higher dose without. The dose in the trials is
What the studies found
Meta-Analysis2024Current medicinal chemistry
Does Quinoa (Chenopodium quinoa) Consumption Improve Blood Glucose, Body Weight and Body Mass Index? A Systematic Review and Dose-Response Meta-Analysis of Clinical Trials.
The present analysis revealed the beneficial effects of quinoa on the blood glucose level.
PubMed 36847233 ↗
Meta-Analysis2020Journal of the American Heart Association
Potassium Intake and Blood Pressure: A Dose-Response Meta-Analysis of Randomized Controlled Trials.
Background Epidemiologic studies, including trials, suggest an association between potassium intake and blood pressure (BP).
PubMed 32500831 ↗
Meta-Analysis2020JCI insight
Fluid-electrolyte homeostasis requires histone deacetylase function.
Histone deacetylase (HDAC) enzymes regulate transcription through epigenetic modification of chromatin structure, but their specific functions in the kidney remain elusive.
PubMed 32673289 ↗
Meta-Analysis2013BMJ (Clinical research ed.)
Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses.
High quality evidence shows that increased potassium intake reduces blood pressure in people with hypertension and has no adverse effect on blood lipid concentrations, catecholamine concentrations, or renal function in adults.
PubMed 23558164 ↗
Systematic Review2026Biomolecules
The Gut-Bone Axis and Skeletal Health: Regulatory Mechanisms and Therapeutic Applications of Plant-Derived Bioactive Compounds.
Future directions will focus on clarifying dose-response relationships, developing standardized synbiotic formulations, constructing microbiome-guided precision diets, and conducting large-sample randomized controlled trials to translate plant-derived compounds into clinical therapies.
PubMed 42352378 ↗Cautions and interactions
- Potassium chloride salt substitutes are dangerous for anyone on an ACE
inhibitor, an ARB, a potassium-sparing diuretic, or with reduced kidney
function. Potassium retention in that setting causes dangerous hyperkalaemia.
- Take iron only with a confirmed deficiency unless a clinician has advised
otherwise. Iron overload is a real disease and iron is a common cause of
poisoning in small children.
When this is not a self-care problem — get help
- Muscle weakness, palpitations or an irregular pulse while taking a potassium
supplement or salt substitute — get urgent medical assessment.
Related
Sources
- Does Quinoa (Chenopodium quinoa) Consumption Improve Blood Glucose, Body Weight and Body Mass Index? A Systematic Review and Dose-Response Meta-Analysis of Clinical Trials. Current medicinal chemistry 2024; doi:10.2174/0929867330666230227151852 PubMed 36847233
- Potassium Intake and Blood Pressure: A Dose-Response Meta-Analysis of Randomized Controlled Trials. Journal of the American Heart Association 2020; doi:10.1158/1055-9965 PubMed 32500831
- Fluid-electrolyte homeostasis requires histone deacetylase function. JCI insight 2020; doi:10.1136/eb-2018-102911 PubMed 32673289
- Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses. BMJ (Clinical research ed.) 2013; doi:10.1136/bmj.f1378 PubMed 23558164
- The Gut-Bone Axis and Skeletal Health: Regulatory Mechanisms and Therapeutic Applications of Plant-Derived Bioactive Compounds. Biomolecules 2026; doi:10.1021/acs.jafc.6c01315 PubMed 42352378