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Are you Zinc Deficient? A simple DIY test from Premier Research Labs

Has anyone ever off-handedly recommended that you take zinc? Most frequently zinc is remembered as an ingredient mixed into glossy, fruit-flavored lozenges to help prevent a pending attack of the common cold, or as packed into synthetic multi-vitamin concoctions for “muscle-bulking.” It is a supplement that seems to be tossed about frequently in conversation with a reputation for general “helpfulness,” but with little clarity regarding its actual importance. However, mysterious zinc is in fact a very powerful mineral that has wide-ranging functions in the fundamental biochemistry of the body. It is integral for proper cellular metabolism and contributes to the make-up of more than 300 enzymes in the human body. Zinc is also involved in complex life-sustaining reactions such as the immune response, protein synthesis and cell division. It is therefore crucial for growth and development, wound healing, energy level maintenance and mood regulation, among other things. Thus despite the common dogma that zinc should only be consumed when about to get sick or after a good work-out, this mineral is actually needed in our everyday activities and is certainly not one to be ignored.

Zinc Assay Taste Test

Food Sources of Zinc

Zinc is an essential nutrient, meaning that it is not organically manufactured within the body and therefore needs to be consumed in the form of food or supplemental sources. The recommended daily intake of zinc is between 10-20 mg per day, though this is variable depending on age and health condition. This may seem like a modest amount, however given the mineral-deficient state of modern food sources and rampant problems with gastrointestinal function in the United States, you may be surprised at just how difficult accumulating this small quantity can be. Zinc is most commonly found in seafood, but is also present in eggs, certain meats, and nuts. Some breakfast cereals and processed grains will also claim to be fortified with 25% of the daily value of zinc in a serving. This is a somewhat comical assertion however, as commercial cereals are rich in phytates (the very irritating substance found in unsoaked/sprouted grains and nuts), which significantly reduce the absorption of zinc, and can even contribute to zinc deficiency. Therefore, those individuals who are vegetarians or who consume a low animal product, highly-refined carbohydrate diet are at a particular risk for zinc deficiency regardless of food fortification. The bioavailability of zinc from plant sources can be increased by personally preparing foods using the techniques of soaking, sprouting and fermenting grains and seeds, however supplementation may still be required for adequate maintenance levels. Nourishing Traditions is a valuable resource for learning more about these food preparation techniques.

Zinc Infograph

Zinc Deficiency

While overt zinc deficiency is believed to be uncommon in North America, there is a significant risk for zinc inadequacy. Individuals with increased risk for insufficient levels of zinc include those experiencing gastrointestinal disorders, malignancies or other chronic illnesses, alcoholics, vegetarians, and pregnant or lactating women. Such circumstances cause biochemical changes in the body which result in poor absorption, expedited losses or increased zinc requirement. Zinc also competes for absorption with copper, iron, calcium and magnesium within the body. Because these minerals work in very specific ratios, over-supplementation with other isolated minerals (in the form of tablets or food fortification) can also significantly block the absorption of zinc. This has become a notable problem with iron, as large-dose supplementation and fortification has become a popular treatment effecting millions of people with iron-deficiency anemia. Finding a balanced whole foods source of iron, or taking supplemental iron between meals, are helpful ways of reassuring zinc availability remains adequate as well. Because of zinc’s diverse roles in the body, symptoms of deficiency can be somewhat non-specific and generalized, thus making it easily confused with other signs of illness or nutrient inadequacy. However, if you are currently being treated for any of the following symptoms, zinc may be an appropriate adjunct therapy to discuss with your provider.

  • Delayed wound healing
  • Taste & smell disorders
  • Impaired growth & sexual development
  • Hyperactivity
  • Impaired Adrenal Function (including stress, anxiety)
  • Skin disorders
  • Irritable Bowel Syndrome
  • Vision Degeneration
  • Iron non-responsive anemia
  • Pica (eating dirt)
  • Eating disorders (such as anorexia, bulimia)

The Zinc Assay Taste Test

Zinc supplies are tightly controlled and distributed throughout the body for protein and nucleic acid compositions. There is no specific system for zinc storage in the human body, and it is thus regulated tightly by homeostatic mechanisms which keep about 98% of the body's supply within the cells at any given time. This system makes zinc levles very difficult to measure using overt laboratory methods. Plasma and serum tests for zinc levels are the most common means of evaluation, however they pose significant difficulties because they are not indicative of cellular zinc. There is however, a simple DIY taste test first reported in the medical journal, The Lancet, that can help determine physiological zinc levels. This test uses Premier Research Labs Liquid Zinc Assay, an easily absorbed form of supplemental zinc sulfate heptahydrate, to yield rapid and accurate results. Quite simply, you taste a teaspoon full of the Zinc Assay and will find that you experience varying tastes based on your body’s current needs. If your are deficient in zinc, the liquid will taste like water, while if you have adequate levels it will taste bitter. You can assess your levels more specifically using the guide below.

Zinc Taste Test

While it is obviously not advisable to use supplements lightly or randomly, this one time non-invasive test can give you some very significant insight about your nutritional status. Oftentimes our very own senses and biofeedback provide accurate information that can yield more immediate and meaningful results than complex laboratory analysis.


Zinc: Dietary Supplement Facts by CDC 

The Natural Pharmacy: Zinc by Alan R. Gaby, MD

Zinc Taste Test by Ronald L. Meyers CNC

*All articles and information on this website are for educational purposes only. They are not to be regarded or relied upon as medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, cure, treat or prevent any disease. Results may vary per person. Consult your health practitioner if you have health problems. 


I recently read that 80% of patients suffering from Schizophrenia tested with a zinc deficiency. I would appreciate feed back on this...A concerned mother
Posted @ Tuesday, February 25, 2014 9:07 AM by Judi
Hi Judi, 
The link between zinc deficiency and mental illness is well documented. Zinc is closely involved with the formation of the many enzymes, amino acids, hormones and neurotransmitters that effect behavior and mood. Some studies have linked a malfunctioning zinc metabolism with depression, anxiety, ADHD and schizophrenia. If you suspect this, I recommend connecting with a functional medicine practitioner or integrative psychiatrist that can do a comprehensive assessment and test levels directly.
Posted @ Wednesday, February 26, 2014 11:53 AM by Kayla Grossmann
I have been using the Zinc Assay Test for two weeks. During that time I have supplemented zinc at a high dose because the zinc sulfate tastes like water. How long does it take the average person to go from zinc deficient to optimal zinc?
Posted @ Sunday, June 15, 2014 6:48 PM by Michael
Hi Michael! This is a difficult question to answer, as the response varies greatly from person to person depending on health history, age, diet, lifestyle etc. Some experience a quick reaction, whereas others with more depleted stores need to rebuild them over time. If you are interested in more detailed and personalized information, I recommend working with your health care practitioner to have your levels tested directly.
Posted @ Monday, June 16, 2014 1:13 PM by Kayla Grossmann
After blood work, we were told that 
my 11 y/o son was deficient in zinc.  
I put 1 tsp. in water and after the 
first drink, he complained that it 
was sour and that it made him feel 
like he wanted to throw up. What now? 
Posted @ Wednesday, July 16, 2014 10:50 AM by Karen
If one is zinc deficient and then opts to take a zinc supplement, would extra copper be wise to add to the mix?  
Posted @ Sunday, August 10, 2014 7:24 PM by Jayson
Hi Jayson! Good point. Zinc and copper function optimally when in the proper ratio. This exact balance will vary from person to person based on diet, environmental exposure etc. Some people get adequate copper from these sources without needing additional supplementation. I wrote an article on Nutrient Dense Foods and the Zinc-Copper Connection with more information. Working with a functional medicine practitioner who can run labs and develop a personalized treatment plan is also advisable.
Posted @ Monday, August 11, 2014 11:08 AM by Kayla Grossmann
Hi Karen, 
Because zinc is an intracellular mineral, levels can be difficult to test totally accurately. Oftentimes practitioners will use a symptom analysis along with the zinc taste test and a blood test or hair mineral analysis to make the best decisions for supplementation. Increasing food sources of zinc may be a viable option for increasing intake in a balanced and safe way. I know it isn't always an option, but my best advice would be to work with a functional medicine or integrative provider if at all possible too. I hope that is helpful!
Posted @ Monday, August 11, 2014 11:14 AM by Kayla Grossmann
Thanks, KG!
Posted @ Monday, August 11, 2014 6:21 PM by Jayson
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