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Please do these naturopathic home tests, in order that Mary-Lou may better assess your digestive and/or endocrine function. Please do not take alcohol or diet coke or antacid medication the night before you do the tests.

Should you do any of these tests outside of a consultation with Mary-Lou, and wish to chat about your results, and look at how you can work with Mary-Lou to support improvements in your health, you are welcome to Click here to book a free 20 minute chat with Mary-Lou.

Alternately, you may prefer to Book a Consultation immediately


  • This test must be done prior to all consultations, please.
  • Candida is typically (but not exclusively) present where you have any fungal infections, allergies, diabetes, cancer, or when you have taken antibiotics, the contraceptive pill, or HRT. You are more susceptible to candida if you drink alcohol or smoke excessively, eat a lot of sugar or often experience high-stress levels.
  • Click Here for a test to determine the potential presence of Candida (yeast overgrowth), or imbalance of good gut bacteria


  • This test must be done prior to all consultations please.
  • Potential of insufficient stomach (hydochloric) acid
  • Symptoms often manifest as what appears to be too much acid (e.g. acid reflux or indigestion/heartburn)
  • If stomach acid is low, you cannot digest your protein properly, which can lead to various problems including allergies, hormonal imbalance, inefficient digestion, etc
  • Click Here for the Bicarbonate of Soda Test instructions.


When would you run this test?

This test is an actual measurement of how long you can hold a deep breath, which is a method to check if you have an acid or alkaline imbalance.


While sitting, “take a deep breath and hold it as long as you can.” Use a stopwatch or timer to time the breath-holding. When you can no longer hold your breath, record the seconds the breath was held and message Mary-Lou the results.


INCREASED BREATH-HOLD TIME: Longer than 65 seconds

Clinical Implications Additional Information

Metabolic alkalosis Alkalosis causes an increased oxygen uptake and

Respiratory alkalosis transport leading to an increased ability to hold one’s


DECREASED BREATH-HOLD TIME: Less than 40 seconds

Clinical Implications Additional Information

Metabolic acidosis In acidosis a decreased transport and uptake of oxygen

Respiratory acidosis by the body leads to a decreased breath holding time.

Anaemia: Decreased oxygen-carrying capacity of red blood cells due to

anaemia may decrease breath-hold time.

Other causes include; Antioxidant deficiency, emotional stress, anxiety

Factors that Interfere with the results: (pls note if this applies to you)

  • Cardio-pulmonary disease
  • Respiratory tract infections


Interestingly, the oral taste test involves you holding 10 millilitres of liquid zinc in your mouth for 10 seconds. Because liquid zinc has an intense taste, if your zinc levels are normal, you will probably not be able to tolerate the strong taste for very long. It will taste quite bitter. In fact, you may want to immediately expel the liquid from your mouth!


To do this test, you will need to purchase an inexpensive bottle of Zincatest supplement (100 mls) £9.95 (available at The Natural Dispensary UK):

    1. You will need to open a free account and put ‘Mary-Lou Harris’ as your practitioner. Then put the promo code MLH010 at the checkout stage for a 10% discount.


As a taste test to indicate zinc status: Take the test at least one hour after food or drink. Simply add 5ml of Zincatest solution to 60ml of water and immediately swirl one 5ml spoonful of the diluted mixture around in the mouth for 10 seconds (this mixture can then be swallowed or spat out). The taste sensation that results from this test provides an indication of zinc status:

  1. Tasteless like water: Low.
  2. Slightly dry, furry, mineral-like or even sweet taste develops after a few seconds: Marginally Low.
  3. Definite taste, which intensifies with time: Marginally Positive.
  4. Strong, unpleasant taste noticed immediately: Positive.

If response corresponds to 1 or 2 above, use a zinc supplement or Zincatest until response improves to 3 or 4. A 3 to 6-month course may be necessary.

A fresh solution should be made up each time. Do not exceed recommended daily dose.

If you are deficient, however, you will likely be able to hold the zinc in your mouth without any difficulty because it will taste like water. This is so because the absence of sufficient zinc in your body has somewhat disabled your sense of smell and taste, which means you will not be affected by liquid zinc's intensity. In fact, by the ease with which it is tolerating the liquid zinc, your body is signalling you that it desperately needs this mineral.


To do this test, you will need to purchase a bottle of Lugols Iodine 15% (50ml) £21.50 (available at The Natural Dispensary UK):

    1. You will need to open a free account and put ‘Mary-Lou Harris’ as your practitioner. Then put the promo code MLH010 at the checkout stage for a 10% discount.

The iodine patch test is a test where you paint a patch of iodine on your inner thigh on your skin (best done 1st thing in the morning, for ease of observation purposes) and check how it looks 24 hours later. If you are NOT iodine deficient, the patch will fade no sooner than 24 hours. Any sooner, and a deficiency is likely, because the iodine will be absorbed into the skin more quickly.


  1. If it disappears in less than 8 hours, you desperately need iodine. Please follow Mary-Lou's guidance, or continue to apply the iodine to your skin until you respond as number 3 indicates, below.
  2. If it disappears between 8 and 24 hours, you still need additional iodine. Do the same as recommended in number 1) above or follow Mary-Lou's guidance.
  3. If it simply stays on your skin and begins to slowly fade in colour after a full 24 hours, it indicates that your status is that of iodine sufficiency.


Click here to download.

  • It helps to identify how your adrenals help you with STRESS MANAGEMENT, and if your kidneys are functioning well
  • You will need to purchase an upper arm blood pressure monitor such as the one in the link.
  • Simply follow the instructions on the downloadable document
  • Record your readings, and send them to [email protected] if you would like support from Mary-Lou in terms of how to progress.


  • Only do this test if Mary-Lou has requested it prior to, or during your consultation
  • Check your thyroid, adrenals and immune function
  • In order to record your daily temperature readings for the month, you will need to purchase a mercury-style thermometer. The old mercury thermometers are no longer allowed by the World Health Organisation due to the dangers of mercury. Therefore we have sourced a non-mercury alternative for you which is appropriate to use when doing this test. It is more accurate than the digital thermometer. Click Here to buy if you are in the UK. If you are in South Africa and you cannot import one please use the digital thermometer.
  • Click Here for the chart where you can record your daily temperature readings for a month, then email the completed chart to Mary-Lou at [email protected]