Zinc: Benefits for Testosterone, Inflammation, and More

A closer look at what zinc actually does in the body, and where the evidence is strong versus thin.

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By the Ration Editorial Team · Reviewed against primary research · Updated July 14, 2026

Zinc is a trace mineral the body needs in small but steady amounts.

It acts as a cofactor for hundreds of enzymes involved in DNA synthesis, immune defense, and cell division.

It also plays a direct role in hormone regulation, including testosterone production, and in controlling inflammatory signaling.

Because the body cannot store much zinc, a regular dietary supply matters for maintaining normal status.

Zinc supports the enzymes involved in testosterone synthesis in the testes, and low zinc status has been tied to disrupted hormone signaling along the hypothalamic-pituitary-gonadal axis.

On the inflammation side, zinc helps regulate immune cell activity and appears to dampen the production of inflammatory cytokines that drive C-reactive protein (CRP) synthesis in the liver^[6][10].

Blood zinc levels can be tricky to interpret, since they shift with inflammation, fasting status, and lab methodology, which complicates research in this area^[2].

Our database rates the evidence for zinc increasing total testosterone as grade A, based on 6 sources, with a consistent direction of effect.

A systematic review found a clear correlation between serum zinc and testosterone levels across multiple studies^[3].

Separate research in men found that low serum zinc was associated with low serum testosterone, though not with erectile function specifically^[4].

A study in men with benign prostatic hyperplasia also found a relationship between zinc status and testosterone^[5].

This pattern is not new. Research from the 1990s already linked zinc status to serum testosterone in healthy adults^[11].

Notably, a randomized controlled trial in postmenopausal women found that zinc supplementation improved testosterone levels and sexual function, suggesting the effect is not limited to men^[8].

Older literature on impotence also touched on zinc's role in male sexual health, though this evidence is dated and limited^[12].

Taken together, the strongest signal is that correcting a zinc deficiency tends to raise low testosterone. Whether extra zinc helps someone who is already replete is far less clear.

Our database rates zinc's effect on lowering C-reactive protein as grade A, also based on 6 sources.

A 2021 meta-analysis of randomized controlled trials found that zinc supplementation significantly reduced CRP and other inflammatory cytokines^[7].

An earlier 2018 systematic review and meta-analysis reached a similar conclusion, reporting a meaningful drop in plasma CRP with zinc supplementation^[9].

A trial in people with chronic liver disease found that higher elemental zinc intake was inversely associated with CRP and markers of oxidative stress^[10].

Animal research also supports this mechanism. In diet-induced obese rats, zinc supplementation improved CRP alongside other metabolic markers like leptin and HOMA-IR^[6].

• ↑Total TestosteroneAHuman trials

  Research may raise Total Testosterone · strong agreement · 6 studies

  View 5 studies on PubMed

  • Correlation between serum zinc and testosterone: A systematic review (2023)
  • Effect of Zinc on Testosterone Levels and Sexual Function of Postmenopausal Women: A Randomized Controlled Trial (2021)
  • Low serum zinc concentration is associated with low serum testosterone but not erectile function (2023)
  • TESTOSTERONE AND SERUM ZINC LEVELS IN MEN WITH BENIGN PROSTATIC HYPERPLASIA (2023)
  • Zinc status and serum testosterone levels of healthy adults (1996)
• ↓C-Reactive ProteinAHuman trials

  Research may lower C-Reactive Protein · strong agreement · 6 studies

  View 5 studies on PubMed

  • The effect of zinc supplementation on plasma C-reactive protein concentrations: A systematic review and meta-analysis of randomized controlled trials (2018)
  • Impact of Vegan and Vegetarian Diets on Neurological Health: A Critical Review (2025)
  • The Effects of Zinc Supplementation on C-Reactive Protein and Inflammatory Cytokines: A Meta-Analysis and Systematical Review (2021)
  • Elemental Zinc Is Inversely Associated with C-Reactive Protein and Oxidative Stress in Chronic Liver Disease (2017)
  • Pitfalls in the interpretation of blood tests used to assess and monitor micronutrient nutrition status (2023)

Zinc is widely distributed in animal and plant foods, though absorption tends to be higher from animal sources.

• Oysters and other shellfish
• Red meat and poultry
• Pumpkin seeds and other seeds
• Chickpeas, lentils, and other legumes
• Cashews and almonds
• Dairy products like cheese and yogurt
• Whole grains and fortified cereals

People following vegan or vegetarian diets may need to pay closer attention to zinc intake, since plant sources contain compounds called phytates that reduce absorption^[1].

Zinc requirements vary by age, sex, and life stage, with adult men generally needing somewhat more than adult women.

In the trials showing benefits for CRP and testosterone, supplemental doses ranged widely, and researchers often studied people with low baseline zinc status rather than the general population^[3][7][9].

Zinc supplements come in several forms, including zinc gluconate, zinc citrate, zinc picolinate, and zinc sulfate, which differ somewhat in absorption.

Because blood tests for zinc can be affected by inflammation and timing, a single low reading does not always confirm true deficiency^[2].

Zinc from food is considered safe for essentially everyone.

Supplemental zinc, especially at high doses or over long periods, carries real risks.

• Nausea and digestive upset
• Reduced copper absorption with long term high intake, potentially leading to copper deficiency
• Interference with certain medications and mineral absorption
• Altered taste or metallic sensation

Because of the copper interaction, prolonged high-dose zinc supplementation without medical guidance is generally discouraged.

• People with confirmed or suspected zinc deficiency
• Those with low testosterone alongside low zinc status^[3][4][11]
• People managing chronic inflammatory conditions, where CRP is elevated^[7][9][10]
• Vegans and vegetarians who may absorb less dietary zinc^[1]
• Postmenopausal women exploring options for low testosterone and related symptoms^[8]

Zinc has some of the more consistent evidence among trace minerals for two specific effects: raising low testosterone and lowering CRP.

Both effects are graded A in our database, backed by multiple studies including systematic reviews and randomized controlled trials.

Most of the testosterone research centers on people who start out zinc deficient, so the effect is best understood as correcting a shortfall rather than boosting levels beyond normal.

A varied diet with zinc-rich foods like shellfish, meat, seeds, and legumes remains the simplest way to maintain healthy status.