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The effect of replacing regular salt with SmartSalt® mineral salt on blood pressure in middle-aged subjects with high blood pressure or with mild hypertension
ISRCTN ISRCTN01739816
DOI 10.1186/ISRCTN01739816
ClinicalTrials.gov identifier
EudraCT number
Public title The effect of replacing regular salt with SmartSalt® mineral salt on blood pressure in middle-aged subjects with high blood pressure or with mild hypertension
Scientific title The effect of replacing regular salt with SmartSalt® mineral salt on blood pressure in middle-aged subjects with high blood pressure or with mild hypertension: a randomised controlled two-arm human study
Acronym N/A
Serial number at source VESU 5070
Study hypothesis The purpose of the study was to investigate the effect of replacing regular salt (NaCl) with SmartSalt® mineral salt on blood pressure in subjects with high blood pressure or with mild hypertension.
Lay summary Not provided at time of registration
Ethics approval The Ethics Committee of the Hospital District of Northern Savo approved on the 26th January 2009 (ref: DNRO 4/2009). An amendment of the protocol was approved on the 22nd September 2009.
Study design Randomised double-blind (main study; follow-up was unblinded) controlled two-arm human study
Countries of recruitment Finland
Disease/condition/study domain High blood pressure/mild hypertension
Participants - inclusion criteria 1. Male or female aged 25 to 75 years (home-living subject)
2. High blood pressure or mild hypertension (systolic blood pressure [SBP] 130 - 159 mmHg or diastolic blood pressure [DBP] 85 - 99 mmHg) (mean of two measurements during the run-in period (visits -4 week and -2 week)
3. Body mass index 23 - 40 kg/m^2
4. Stable body weight (self-reported weight gain or loss less than 3 kg in the past three months)
5. Voluntarily signed informed consent (including willingness to fast 10 - 12 hours before blood samples and abstain from alcohol 2 days prior to blood sampling and abstain from cigarettes, caffeine and physical exercise at least 30 minutes before measurements)
Participants - exclusion criteria 1. Antihypertensive drug treatment
2. Regular non-steroidal anti-inflammatory drug (NSAID) treatment and the use of ciclosporin or tacrolimus
3. Cardiovascular disease (myocardial infarction, unstable angina pectoris, coronary artery bypass graft, percutaneous transluminal coronary angioplasty, temporal ischaemic attack within six months prior to screening) including stroke and congestive heart failure
4. Anaemia, abnormal electrolytes, proteinuria, abnormal liver, kidney and thyroid function, except subjects on thyroid replacement therapy upon decision of investigator
5. Secondary hypertension
6. Diabetes (type 1 and type 2 diabetes)
7. History of cancer or malignant disease within the past five years
8. Low-salt diet: six or less points in the salt intake test (Finnish Heart Association, Helsinki)
9. Previous remarkable use of mineral salts products in daily diet (greater than 30% substitution)
10. Dietary restriction (coeliac disease, serious lactose intolerance, low-carbohydrate diet, sodium restriction, allergy to ingredients of test foods)
11. Alcohol abuse: subjects consuming more than 14 portions of alcohol per week
12. Drug abuse
13. Pregnant and lactating mothers
14. Women planning for pregnancy during the study
15. Participation in clinical trials 30 days prior to this study
16. Participation to other clinical trials during this study
Anticipated start date 09/02/2009
Anticipated end date 04/11/2009
Status of trial Completed
Patient information material Not available in web format, please use the contact details below to request a patient information sheet
Target number of participants 50
Interventions Test product: Smart Salt® mineral salt (sodium chloride [NaCl] 50%, potassium chloride 25%, magnesium ammoniumhexahydrate 25 %)
Placebo product: regular salt (sodium chloride, NaCl)

The study consisted of three periods: a screening period (duration: 4 weeks +/- 7 days), an intervention period (duration: 8 weeks +/- 7 days) and an optional follow-up period (duration: 28 weeks +/- 14 days). The screening period included two study visits (-4 weeks and -2 weeks) and the intervention period included four visits (0 weeks, +3 weeks, +6 weeks and +8 weeks) and the optional follow-up period included two visits (+12 weeks and +28 weeks). After the screening period, 25 subjects were randomised to use Smart Salt® as a table salt and Smart Salt® salted foods (main dishes, bread, sausages and cheese, representing over 50% of the sodium sources in the diet) and 25 subjects were randomised to consume an equivalent regular salt (NaCl) diet respectively for a 8-week period.
Primary outcome measure(s) Change in systolic blood pressure during intervention period measured with automatic sphygmomanometer after 10 minutes resting in sitting position.
Secondary outcome measure(s) 1. Change in diastolic blood pressure and mean of systolic and diastolic blood pressure and heart rate measured with an automatic sphygmomanometer after 10 minutes resting in sitting position. The measurement was repeated three times at intervals of at least two minutes and the mean of two last measurements was used as a result. The blood pressure measurements were made at visits -4 weeks, -2 weeks, 0 weeks, +3 weeks, +6 weeks, +8 weeks and at optional follow-up visits +12 weeks and +28 weeks.
2. 24-hour urinary sodium, potassium, magnesium and creatinine excretion measured just before the intervention (-1 day) and at visit +8 weeks
3. Urine pH measured at the study visits 0 weeks, +3 weeks and +8 weeks by stick test
4. Concentrations of plasma sodium, potassium, magnesium and creatitine measured at visits -4 weeks, 0 weeks and +8 weeks
5. The dietary intake of sodium calculated from 24-hour urinary sodium excretion and study subject's diaries
6. Body weight measured with calibrated digital scales at visits -4 weeks, 0 weeks, +3 weeks, +6 weeks and +8 weeks and optional follow-up visits +12 weeks and +28 weeks
7. Optionally concentrations of plasma renin, plasma aldosterone taken at visits 0 weeks and +8 weeks and serum C-peptide taken at visits 0 weeks, +3 weeks and +6 weeks and +8 weeks
Sources of funding Smart Salt Inc. (USA)
Trial website
Publications 1. 2011 results in http://www.ncbi.nlm.nih.gov/pubmed/21888642
Contact name Dr  Mika  Kastarinen
  Address Neulaniementie 2 L 6
  City/town Kuopio
  Zip/Postcode 70210
  Country Finland
  Email mika.kastarinen@fimea.fi
Sponsor Smart Salt Inc. (USA)
  Address c/o Tapio Mäki
1261 Prospect Street, Suite 9
La Jolla
  City/town California
  Zip/Postcode 92037
  Country United States of America
  Email tapio.maki@smartsalt.com
  Sponsor website: http://www.smartsalt.com
Date applied 11/11/2009
Last edited 17/01/2012
Date ISRCTN assigned 27/01/2010
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