Why Zinc Is Essential: What It Does, How Much You Need and Best Sources

Zinc helps your immune system work, wounds heal, your body build protein and DNA, and your hormones stay in balance. Adult men need about 11 mg a day and women about 8 mg. Oysters, red meat, poultry, shellfish, beans, nuts and dairy are the best sources. Most people who eat a varied diet get enough without a supplement.

What does zinc do in the body?

According to the NIH Office of Dietary Supplements, zinc:

• Helps your immune system fight off bacteria and viruses
• Is needed to make proteins and DNA
• Helps wounds heal
• Supports your sense of taste and smell
• Supports normal growth during pregnancy, childhood and adolescence

For people who train, that means zinc is part of recovery, tissue repair and staying healthy through hard training blocks.

Does zinc raise testosterone?

Only if you are low. In one study, zinc deficiency was linked to lower testosterone in men, and correcting a deficiency raised it (Prasad et al., 1996). But in healthy men who already ate enough zinc, a ZMA supplement did not raise testosterone (Koehler et al., 2009). So zinc fixes a problem. It does not boost you past normal. More in top supplements for increasing testosterone.

Who is at risk of low zinc?

• Vegetarians and vegans, because plant foods contain compounds that reduce zinc absorption
• People with digestive conditions like Crohn’s disease or ulcerative colitis, or who have had weight loss surgery
• People who drink a lot of alcohol
• Older adults with poor appetite
• Athletes who sweat heavily and eat poorly, though most get enough from food

What are the signs of low zinc?

Loss of appetite, slow wound healing, frequent infections, hair loss, changes in taste and smell, and in men, lower testosterone. These signs are not specific, so talk to a doctor rather than guessing.

How much zinc do I need a day?

• Adult men: 11 mg
• Adult women: 8 mg
• Pregnancy: 11 mg
• Upper limit for adults: 40 mg a day from all sources

Taking more than the upper limit for a long time can lower your copper levels and weaken your immune system (NIH ODS). Many testosterone booster products contain well over the recommended amount (Clemesha et al., 2020).

What foods are highest in zinc?

• Oysters, by far the richest source
• Beef, pork and lamb
• Crab and lobster
• Chicken and turkey, especially dark meat
• Beans, chickpeas and lentils
• Pumpkin seeds, cashews and other nuts
• Yogurt, milk and cheese
• Fortified breakfast cereals
• Eggs

Should I take a zinc supplement?

If you eat meat, seafood, dairy and beans regularly, probably not. If you are vegan, have a gut condition or your doctor finds you low, a modest supplement in the 8 to 15 mg range can help. Some lifters like ZMA at night. That is fine if your total stays under 40 mg and you are not stacking it with other zinc products.

How does zinc fit with other minerals?

Zinc is one of several minerals that matter for training. Magnesium supports muscle and nerve function and sleep, iron carries oxygen, calcium builds bone, and potassium and sodium manage fluid balance and muscle contractions. High doses of one mineral can block another, which is why food first is the safer approach. If you think you are low in iron, read signs of low iron.

For more on recovery nutrition, read whey vs collagen vs bone broth. If you want a nutrition plan for your goals, take the XPL quiz.