Zinc Deficiency Symptoms: Signs, Causes & Support

Zinc is one of 16 essential trace minerals your body needs for optimal health. Next to iron, it is the most abundant mineral in your body and is found in almost every cell. Zinc is central to the proper functioning of more than 300 enzymes and is essential for proper growth and development.

Because Zinc is incorporated into about 10% of all human proteins and is involved in virtually every metabolic process, its deficiency produces a remarkably wide range of Zinc deficiency symptoms. Understanding these symptoms is the first step toward restoring balance and protecting your long-term health.

Dietary Zinc deficiency is quite common in the developing world, affecting an estimated 2 billion people. In North America, overt Zinc deficiency is not common, but the symptoms of mild deficiency are diverse due to Zinc's ubiquitous involvement in metabolic processes. Notably, 35%–45% of adults aged 60 years or older have Zinc intakes below the estimated average requirement, and even when dietary supplements are considered, 20%–25% of older adults still have inadequate Zinc intakes.

Zinc deficiency symptoms span multiple body systems, reflecting the mineral's far-reaching roles. According to clinical research, Zinc deficiency is characterized by:

• Growth retardation — particularly in children during periods of rapid development
• Loss of appetite
• Impaired immune function — people who are deficient in Zinc are more susceptible to infections
• Hair loss
• Diarrhea
• Delayed sexual maturation
• Impotence and hypogonadism in males — Zinc deficiency causes hypogonadism, where the testes produce less testosterone
• Eye and skin lesions
• Loss of taste (ageusia) and smell (anosmia) — Zinc deficiency at any age can cause this

In older adults, Zinc deficiency symptoms can extend to delayed wound healing and problems with thinking, reasoning, and memory. Low levels of Zinc have been detected in people with a number of conditions including diabetes, eating disorders, male infertility, diarrhea, and osteoporosis.

Because Zinc deficiency impairs virtually all aspects of innate and adaptive immunity, it alters the number and function of neutrophil granulocytes, monocytes, natural killer (NK) cells, T cells, and B cells. T cell functions and the balance between different T cell subsets are particularly susceptible to changes in Zinc status.

Certain groups of people may have trouble getting enough Zinc and may be more likely to experience Zinc deficiency symptoms:

• People who have had gastrointestinal surgery, such as weight loss surgery
• People with digestive disorders, such as ulcerative colitis or Crohn's disease
• Vegetarians — because phytic acid in plant foods reduces Zinc absorption, some researchers suggest that vegetarians may need up to 50% more Zinc
• Older adults — a significant percentage have inadequate Zinc intakes
• Alcoholics
• People with sickle cell disease
• Children with celiac disease or IBD — Zinc deficiency in these children is attributed to insufficient intake, reduced absorption, and increased intestinal loss from the inflammatory process
• Those on long-term proton pump inhibitor treatments

Populations in developing countries whose diets are high in phytate and lacking foods from animal origin are also at significantly elevated risk. A Zinc absorption of only 10–15% is estimated from diets containing mainly unrefined cereal grains or legumes with negligible amounts of animal proteins, compared to 30–50% from diets rich in animal foods.

One of Zinc's prime uses comes in boosting the immune system. Zinc supplementation improves immune system function, helping protect against colds and upper respiratory illnesses. Research suggests that Zinc lozenges containing more than 75 mg/day of elemental Zinc shortened common cold duration on average by 33%. Zinc's immune-boosting capabilities have also shown benefit in supporting the body's response to Candida or yeast infection in women, an effect that may be enhanced by combining Zinc with vitamins A, C, and E.

For men, Zinc plays critical roles in reproductive health. The hormone testosterone requires Zinc for its production, and Zinc deficiency is directly associated with reduced testosterone levels. Infertility resulting from low testosterone levels may respond to increased Zinc intake. A meta-analysis found that Zinc supplementation significantly improved semen volume, sperm motility, and normal morphology in infertile males. Symptoms resulting from an enlarged prostate or benign prostatic hyperplasia (BPH) may also be relieved with additional Zinc, as the healthy prostate accumulates the highest concentration of Zinc of any tissue in the body.

Individuals facing surgery are encouraged to take sufficient Zinc, vitamin A, and vitamin C before and after surgery. Studies show that taking sufficient amounts of these nutrients may help optimize wound healing. Zinc plays a central role in all phases of wound healing, with antioxidant and anti-inflammatory properties.

Zinc also supports eye health. Research has shown that taking supplements of Zinc with antioxidants may slow the progression of age-related macular degeneration (AMD), with the AREDS and AREDS2 large randomized controlled trials representing some of the highest-quality evidence for this application.

Additionally, Zinc has well-documented anti-inflammatory activity. It inhibits NF-κB activation, suppresses pro-inflammatory cytokines (IL-6, TNF-α), and reduces oxidative stress markers. These mechanisms contribute to Zinc's broad systemic benefits across the immune, reproductive, and integumentary systems.

Take one (1) tablet daily with meals. Store in a cool, dry place and away from direct light.

Each tablet contains 20 mg of OptiZinc®. The Recommended Dietary Allowance (RDA) for Zinc is 8 mg/day for women and 11 mg/day for men. The Tolerable Upper Intake Level (UL) for adults is 40 mg/day.

This product is gluten free, dairy free, soy free, and grain free.

It is worth noting that taking supplements containing a substantial amount of iron (25 mg or more) at the same time as Zinc supplements can reduce Zinc absorption. If you take iron supplements, consider spacing them apart from your Zinc. Zinc may also interact with certain medications, such as quinolone antibiotics, tetracycline antibiotics, and penicillamine — consult with your healthcare provider if you are taking any of these medications.