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Practical guide

How to Measure Blood Pressure at Home, Accurately

Whether you are testing a supplement or simply keeping watch, home readings are only useful if they are taken the same careful way every time.

Checked October 16, 2026Label-matched3 linked sources

Choose the right cuff

Use an automatic upper-arm monitor that has been clinically validated; your pharmacist can help. Wrist and finger devices are more error-prone. The cuff must fit your arm: a cuff that is too small reads high, one that is too large reads low. Measure your upper arm and check the cuff range on the box.

The routine

  1. No caffeine, exercise or smoking for 30 minutes before.
  2. Empty your bladder.
  3. Sit in a chair with your back supported and feet flat for five minutes, without talking.
  4. Rest your arm on a table so the cuff is at heart level, on bare skin.
  5. Take two readings one minute apart. Record both, with date and time.
  6. Repeat in the evening if your clinician asks.

This follows the measurement approach described in the ACC/AHA guideline[1].

Average, do not react

Single readings vary with stress, sleep, temperature and even conversation. Look at weekly averages. For a supplement or lifestyle trial, take a week of baseline readings first, then compare weekly averages after you start. A change of less than about 5 mmHg is hard to separate from normal variation.

What the numbers mean

CategorySystolic / Diastolic
Normalunder 120 and under 80
Elevated120-129 and under 80
Stage 1130-139 or 80-89
Stage 2140+ or 90+
Crisisover 180 and/or over 120

High blood pressure often has no symptoms[2][3]. Readings over 180/120 need prompt medical advice, and urgent care if you have chest pain, shortness of breath, weakness, vision or speech changes.

Share the log

Bring your log, or the monitor's memory, to appointments. A week of careful home readings tells your clinician more than a single reading in the office, where "white coat" nerves can push numbers up.

Sources for this page

Every entry links to the original record. The trials used single amino acids, usually at several grams a day; none of them tested the Melonex capsule.

  1. 1Whelton PK, Carey RM, Aronow WS, et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA guideline for the prevention, detection, evaluation, and management of high blood pressure in adults. Hypertension. 2018;71(6):e13-e115. pubmed.ncbi.nlm.nih.gov/29133356/
  2. 2National Heart, Lung, and Blood Institute. High Blood Pressure: What Is High Blood Pressure? www.nhlbi.nih.gov/health/high-blood-pressure
  3. 3MedlinePlus (U.S. National Library of Medicine). High Blood Pressure. medlineplus.gov/highbloodpressure.html

Ready to run a fair 60-day Melonex trial?

Orders finish on the maker's BuyGoods checkout. Keep a morning blood pressure log, and if the numbers do not move, email support before day 60: opened and empty bottles both qualify.

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