What Does Zinc Do for the Body? A Complete Guide

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.

The body uses Zinc to make DNA — the genetic material in cells — and proteins. It is incorporated into about 10% of all human proteins, and Zinc metalloenzymes are found in all six enzyme classes, meaning Zinc participates in the metabolism of proteins, carbohydrates, fats, and nucleic acids.

Understanding what Zinc does for the body starts with recognizing its sheer reach: it supports immune regulation, reproductive health, wound healing, hormonal balance, sensory function, and much more. Because the body cannot synthesize Zinc on its own, it must be obtained from dietary or supplemental sources.

Immune System Support

For more than 50 years, it has been known that Zinc deficiency compromises immune function. Virtually all aspects of innate and adaptive immunity are affected by Zinc — from neutrophils and natural killer cells to T cells and B cells. Studies suggest that Zinc supplementation modulates immune biomarkers and, in certain formulations and doses, may reduce the duration of upper respiratory infections.

People who are deficient in Zinc are more susceptible to infections. Research suggests that Zinc supplementation improves immune system function, helping protect against colds and upper respiratory illnesses. Zinc lozenges have been shown to be particularly effective, with multiple meta-analyses confirming that Zinc acetate and gluconate lozenges containing more than 75 mg/day of elemental Zinc shortened common cold duration on average by approximately 33%.

Male Reproductive Health

Zinc is an essential trace mineral for the normal functioning of the male reproductive system. It is highly concentrated in seminal plasma and plays direct roles in spermatogenesis, sperm chromatin stability, capacitation, and testosterone balance. The hormone testosterone requires Zinc for its production, and Zinc deficiency in adult men causes hypogonadism, where the testes produce less testosterone.

Research suggests that Zinc supplementation may significantly improve semen volume, sperm motility, and normal morphology in infertile males. Symptoms resulting from an enlarged prostate or benign prostatic hyperplasia (BPH) may also be supported with additional Zinc — the healthy prostate accumulates the highest concentration of Zinc of any soft tissue in the body, and studies show that BPH tissue has significantly lower Zinc levels than normal tissue.

Wound Healing and Recovery

Zinc plays a central role in all phases of wound healing, with antioxidant and anti-inflammatory properties. Research suggests that people who have wounds such as skin ulcers and who also have low levels of Zinc may benefit from taking a Zinc supplement. Individuals facing surgery are encouraged to take sufficient Zinc, vitamin A, and vitamin C before and after surgery, as studies show that taking sufficient amounts of these nutrients may support optimal wound healing.

Enzymatic and Structural Functions

Zinc is required for the activity of more than 300 enzymes covering all six classes. It forms "Zinc fingers" — sequences enabling transcription factors to bind to DNA — which are essential for gene expression and regulation. Zinc also contributes to chromatin stability, DNA synthesis, and the structural integrity of proteins throughout the body.

Hormonal Interactions

There are numerous physiologically relevant interactions between Zinc and various hormones, including testosterone, adrenal corticoids, insulin, and growth hormone. Production, storage, secretion, and hormone receptor interactions can all be involved. Research suggests that Zinc may help increase insulin sensitivity, and people with type 2 diabetes often have low Zinc levels.

Taste, Smell, and Neurological Function

Zinc is important for the proper sense of taste and smell. Deficiency can cause ageusia (loss of taste) and anosmia (loss of smell). Zinc is also required for neurological development, and deficiency in older adults has been associated with cognitive impairment and problems with thinking, reasoning, and memory.

While everyone needs Zinc for fundamental biological processes, certain individuals may benefit most from supplementation. Men concerned about reproductive health may find Zinc particularly relevant, as research suggests it supports testosterone production, sperm quality, and prostate function. Men experiencing symptoms associated with benign prostatic hyperplasia (BPH) may also benefit from additional Zinc intake.

Individuals looking to support their immune system — especially during cold and flu season — may consider Zinc supplementation. Research suggests Zinc may help reduce the severity and duration of upper respiratory infections when taken promptly at symptom onset.

Certain populations are at greater risk for Zinc deficiency: people who have had gastrointestinal surgery such as weight loss surgery, those with digestive disorders such as ulcerative colitis or Crohn's disease, vegetarians (since Zinc bioavailability from plant foods is lower due to phytate content), and older adults — studies indicate that 35%–45% of adults aged 60 years or older had Zinc intakes below the estimated average requirement.

Because of its immune-boosting capabilities, Zinc has also shown benefit in supporting those dealing with Candida or yeast infection, an effect that may be enhanced by combining Zinc with vitamins A, C, and E. Individuals preparing for or recovering from surgery may also benefit, as Zinc plays a central role in all phases of wound healing.

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®.

Taking Zinc with meals supports absorption, and OptiZinc®'s methionine-bound form is specifically designed to resist binding with dietary fiber and phytate — compounds commonly found in plant-based foods that can inhibit ordinary Zinc absorption.

Be aware that taking supplements containing a substantial amount of iron (25 mg or more) at the same time as Zinc supplements can reduce Zinc absorption. Zinc may also interact with certain medications, including quinolone and tetracycline antibiotics and penicillamine. If you are taking any of these medications, consider separating doses — take the antibiotic at least 2 hours before, or 4 to 6 hours after, taking a Zinc supplement.

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