Can You Take Too Much Zinc?

Can You Take Too Much Zinc?

Zinc has been promoted for years as a possible boost for the immune system fighting off infections. Even though there are many other health benefits to zinc supplements, many people who want to improve their overall immune function tend to gravitate towards zinc supplements. 

Zinc is a nutrient found throughout your body, helps your immune system, and helps overall metabolism. Zinc is also important for wound healing and your sense of taste and smell.

With a varied diet, your body usually gets enough zinc. Food sources of zinc include chicken, red meat, and fortified breakfast cereals.

The main issue with zinc absorption is that it can be blocked by supplements such as Calcium, Iron, or Magnesium and it can interact with other medications such as antibiotics

What is the best way to take my zinc supplements and are there certain supplements that should be avoided? Finally, how much zinc is too much?

What Are Zinc Supplements Good For?

Zinc and the Immune Response.

As stated above zinc is a mineral that is very important to the immune system. It is believed that zinc helps the different types of white blood cells fight off infections better. Some studies have found that zinc helps lower the duration and the number of viral colds, which are part of the coronavirus family. There is some literature on the synergistic effects of zinc and vitamin C have in boosting the immune response to colds. There are ample data on vitamins helping against viral infections since the days of polio in the 1940’s. Most experts recommend taking some were between 5 to 15mg of zinc daily. The Recommended Daily Value (RDV) of Zinc for children 1-3 years of age is at 3 milligram and for adults and children above 4 years of age is recommended at 11 milligrams daily. It is accepted that the upper limit of daily intake for an adult male is at 40mg/day and the lower limit is at 5mg/day.

Zinc, RNA, ACE Receptor. 

Recently there are multiple studies showing that a cell receptor called ACE which is abundant in the adult lung is involved as a gateway for Coronavirus to enter the cell. Hence the virus hits the lungs more commonly and it is less seen in children which have less ACE receptors. Zinc appears to be a sort of a plug that blocks this gateway for the Coronavirus. Newer studies are also showing that zinc can block the enzyme that is responsible for replication of the coronavirus’ genetic code also known as ribonucleic acid (RNA). 

Zinc Deficiency and Male Sexual Function*

Erectile dysfunction can have many factors and is more common in men as they age. However, testosterone is a major factor in providing a healthy erection and low testosterone levels can be related to zinc deficiency. Zinc is a trace mineral that occurs naturally on earth and can be obtained from foods. However, many men suffer from zinc deficiency and do not know its importance regarding male sexual health. Zinc deficiency is prevalent throughout the world, including the USA. Severe and moderate deficiency of zinc is associated with hypogonadism (low testosterone) in men. A study conducted by Wayne State University School of Medicine showed that  zinc supplementation of marginally zinc-deficient normal elderly men for six months resulted in an increase in serum testosterone and their libido. Another study evaluated rats fed 5mg of zinc daily and showed excellent correlation with duration of erections and libido on the rats that were treated with zinc vs. placebo. Zinc supplementation may  boost both total and free testosterone levels. In a study of elite wrestlers, the men took 3 mg/kg/day of zinc for one month along with their normal diet. This is extremely high dosing of zinc and should only be done under supervision of doctors. Levels of total and free testosterone were significantly higher after rest and exhausting exercise following zinc supplementation vs before supplementation.*

Zinc and Wound Healing. 

Successful wound repair requires a series of tightly coordinated steps including coagulation, inflammation, angiogenesis, new tissue formation and extracellular matrix remodeling. Zinc is an essential trace element (micronutrient) which plays important roles in human physiology. Zinc is a cofactor for many metalloenzymes required for cell membrane repair, cell proliferation, growth and immune system function. The pathological effects of zinc deficiency include the occurrence of skin lesions, growth retardation, impaired immune function and compromised would healing. Hence appropriate wound healing and healing overall requires zinc as a major nutrient.* 

Which form of zinc is best absorbed?

Swallowing Your Zinc Supplements.

For one thing Zinc is blocked by absorption of Calcium, Magnesium and Iron in the gut and interferes with absorption of copper, and other medications. Frunutta’s under the tongue absorption avoids this issue by easy absorption under the tongue avoiding the gut absorption issues. However, why the low dose? Some in the medical community believe that Zinc dosing throughout the day is more effective in providing a constant flow of the supplement to your blood stream than once a day dosing, possibly allowing for better fight against infection. There are even some who advocate taking even lower doses of zinc every 3 hours to improve boosting of the immune response. Hence, we at Frunutta, produced a lower dose zinc supplement to allow for multiple daily dosing for our customers. 

The right dose, according to the National Institutes of Health, the average adult should get approximately 10 mg of zinc per day. Since most people get at least some zinc from food, you’ll want to look for a supplement that has between 5 and 15 mg of zinc per serving. 

Too much zinc over long periods of time can lead to nausea, vomiting, and headaches.

Top 15 Foods High in Zinc:

  1. Lamb
  2. Pumpkin Seeds
  3. Hemp Seeds
  4. Grass-Fed Beef
  5. Chickpeas (Garbanzo Beans)
  6. Lentils
  7. Cocoa Powder
  8. Cashews
  9. Kefir or Yogurt
  10. Ricotta Cheese
  11. Mushrooms
  12. Spinach
  13. Avocado
  14. Chicken
  15. Almonds

Intranasal Zinc Sprays

A few years ago the FDA warned consumers to stop using three zinc-containing products: Cold Remedy Nasal Gel, Cold Remedy Swabs, and Cold Remedy Swabs for kids. The federal regulators cited 130 reports of loss of sense of smell among users of the products. Hence, do not use intranasal zinc. This form of zinc has been linked with the loss of the sense of smell.

Under the Tongue Zinc Tablet and Its Advantages.

Under the tongue absorption is one of the best methods of absorbing your supplements and vitamins. It allows tablets to be placed under the tongue and absorbed directly into the bloodstream. It avoids swallowing large tablets. It avoids interaction between supplements and other drugs such as antibiotics which may hinder each other’s absorption. Many are concerned with interaction of zinc and copper as both are major components of antioxidant enzymes important in boosting your immune system. Too much zinc can block copper absorption in the intestinal tract and vise versal but under the tongue dosing eliminates this concern.

Zinc and Multiple Daily Dosing

Some in the medical community believe that zinc dosing throughout the day is more effective in providing a constant flow of the supplement to your blood stream than once a day dosing. There are even some who recommend taking lower doses up to every 3 hours to improve boosting the immune response. Hence, we at Frunutta, produced a lower dose zinc supplement to allow for multiple daily dosing for our customers.

In Summary:

The problem with most of zinc supplements is that they must be swallowed. Now whether you chew, drink, or swallow your vitamins and supplements, the biggest issue is that the vitamin (Dietary Supplement) must not only survive the stomach acids but also avoid interaction with other products such as antibiotics or copper absorption.

The easiest way to get your vitamins is of course via a healthy diet and proper nourishment. But if you fall into the group of people that are deficient and it is out of your control then an under the tongue- sublingual- vitamin may be your best choice.

As always, be sure to consult your doctor before taking any supplement.

This information is only for educational purposes and is not medical advice or intended as a recommendation of any specific products. Consult your health care provider for more information. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.

 *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


Boyles, S. (2010, July 19). Study links zinc nose sprays, loss of smell. WebMD.

CDC Centers for Disease Control and Prevention. (2021, June 22). Coronavirus disease 2019 (COVID-19).

Centers for Disease Control and Prevention. (2021, April 30). Micronutrient malnutrition.

Cleveland Clinic. (2020, November 20). Low sex drive (Hypogonadism): Symptoms, treatment.

Cooper, C. (n.d.). Benefits of zinc supplementation for men’s health. Easy Health Options. (n.d.). Sublingual.

Dissanayake, D., Wijesinghe, P., Ratnasooriya, W., & Wimalasena, S. (2009). Effects of zinc supplementation on sexual behavior of male rats (2800928). US National Library of Medicine.

Frunutta. (2021). Zinc + vitamin C for immune system health & faster healing.

Frunutta. (2021, July 6). Does IV vitamin therapy work?

Healthline. (2021). The link between zinc and erectile dysfunction.

Insel, P., Loomba, R., & Sriram, K. (2020, May 14). What is the ACE2 receptor, how is it connected to coronavirus and why might it be key to treating COVID-19? Yahoo News.

Kilic, M., Baltaci, A., Gunay, M., Gokbel, H., Okudan, N., & Cicioglu, I. (2006). The effect of exhaustion exercise on thyroid hormones and testosterone levels of elite athletes receiving oral zinc (16648789). National Library of Medicine.

Lin, P., Sermersheim, M., Li, H., Steinberg, S., & Ma, J. (2016). Zinc in wound healing modulation (5793244). US National Library of Medicine.

Martin, L. (2017). Cold and flu remedies that work. WebMD.

Mayo Clinic. (2020, November 17). Zinc.

Merriam-Webster. (n.d.). Definition of zinc. In Dictionary.

National Human Genome Research Institute. (2021). Genetic code.

National Human Genome Research Institute. (2021). Ribonucleic acid (RNA).

Prasad, A., Mantzoros, C., Beck, F., Hess, J., & Brewer, G. (1996). Zinc status and serum testosterone levels of healthy adults. ScienceDirect.

Ratini, M. (2021, February 18). Natural cold and flu remedies. WebMD.

Samavati, L., & Uhal, B. (2020). ACE2, much more than just a receptor for SARS-COV-2. Frontiers.

St. Luke's Hospital. (2021). Complementary and alternative medicine.

U.S. Food and Drug Administration. (2020, May 5). Daily value on the new nutrition facts label.

Wayne State School of Medicine. (2021).

WebMD. (n.d.). Making scents of smell [Video].

Wikipedia. (2021, September 9). Angiogenesis. Retrieved September 17, 2021

Your Cart

Your shopping cart is empty.

$ 0.00 USD
Frunutta Dissolvable Vitamins