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Zinc Orotate

Evidence Level
Preliminary
2 Clinical Trials
5 Documented Benefits
1/5 Evidence Score

Zinc orotate is a zinc salt of orotic acid, marketed as a 'highly bioavailable' chelated form on the premise that the orotate ligand carries zinc efficiently into cells. It is about 16% elemental zinc by mass, an ordinary figure for an organic zinc salt and slightly higher than zinc gluconate, so a typical 60 mg tablet of the compound supplies 10 mg of zinc. One randomized human trial has tested it: zinc orotate lozenges, given together with a zinc gluconate nasal spray, did not shorten or ease common colds. The only absorption comparison in any species, in rabbits, found zinc orotate is a poorly soluble salt that entered the blood more slowly than zinc sulfate, and no study in any species shows it is better absorbed than cheaper zinc salts. The broader orotate research base centers on magnesium orotate, and zinc orotate is not on the EU list of permitted zinc sources for food supplements. Any zinc it provides is the same zinc available from far better-studied and cheaper salts such as zinc sulfate.

Studied Dose No established dose; the one trial reported no benefit. Adult zinc targets are 8 to 11 mg/day of elemental zinc, and at about 16% zinc a 60 mg tablet supplies 10 mg.
Active Compound Zinc orotate, the zinc salt of orotic acid, formula C10H6N4O8Zn, molar mass 375.6 g/mol; about 17% elemental zinc by mass, or about 16% for the dihydrate usually sold in supplements.

Benefits

Provides Elemental Zinc

Zinc orotate supplies zinc, an essential mineral that supports immune function, skin health, and hundreds of enzymes, and at about 16% elemental zinc a normal tablet delivers a full daily dose. What is not established is any advantage over cheaper, better studied zinc salts.

Supported by Trial 1, Trial 2

Marketed High-Bioavailability Claim

Products promote orotate as a chelate that enhances zinc absorption and cellular delivery. No human study has tested this. The only absorption comparison in any species, in rabbits, found zinc orotate is a poorly soluble salt that entered the blood more slowly than zinc sulfate, and EFSA's review of orotate mineral salts concluded that zinc from zinc orotate is absorbed comparably to zinc from other organic and inorganic sources, not better.

Supported by Trial 2, Trial 1

Supports Immune Function

The zinc it delivers contributes to normal immune cell development and activity, a generic benefit of adequate zinc status rather than a property unique to the orotate form. This matters mainly where zinc intake is low. The one trial that tested zinc orotate itself, for the common cold, found no benefit.

Supported by Trial 1

Supports Skin And Antioxidant Defense

Zinc participates in skin repair and in antioxidant enzyme systems, so any zinc orotate that is absorbed contributes to these functions in the same way as zinc from better-studied salts. These are established roles of the nutrient and they matter mainly when zinc intake is low. No study has measured skin, hair, nail or oxidative stress outcomes with zinc orotate.

Supported by Trial 1

Orotic Acid Carrier Concept

Orotic acid is a natural pyrimidine intermediate used to justify cellular-support marketing, but this biochemistry does not establish a demonstrated supplementation advantage for zinc orotate.

Supported by Trial 2

Mechanism of action

1

Orotate Carrier Hypothesis

Marketing posits that the orotate ligand ferries zinc into cells more effectively. No human study has compared zinc orotate with another zinc salt, and the one animal comparison, in rabbits, found a slower absorption rate than zinc sulfate. Zinc orotate is also poorly soluble, so it releases little free zinc ion, which is the property the authors of the cold lozenge trial held responsible for whether a zinc lozenge works.

2

Generic Zinc Enzyme Function

Any benefit ultimately reflects zinc's standard roles as a cofactor for enzymes and transcription factors involved in immunity, growth, and tissue repair, identical to zinc from other salts.

3

Ordinary Elemental Zinc Content

Zinc orotate is about 16% zinc by weight, between zinc gluconate at 14% and zinc picolinate at 21%, so a standard 60 mg tablet carries 10 mg of zinc, a full daily dose. Elemental yield is not a practical drawback of this form. The absence of any human evidence for the orotate ligand is.

4

Pyrimidine Precursor Role

Orotic acid contributes to nucleotide synthesis, which is cited to support energy and cellular claims, but a metabolic role of the ligand does not translate into proven benefits for the zinc salt.

Clinical trials

1
Randomized trial: zinc orotate lozenges did not treat the common cold
PubMed

Double blind, placebo controlled randomized trial of zinc orotate lozenges combined with a zinc gluconate nasal spray for common cold treatment (Eby and Halcomb, Alternative Therapies in Health and Medicine, 2006)

77 volunteers with active common cold symptoms, adolescents through middle age; 33 assessed at day 7

At day 7, 10 of 16 zinc treated patients were symptom free (63%) versus 9 of 17 on placebo (53%), P = 0.57, and treatment did not reduce the duration or severity of colds. Only 33 of the 77 people enrolled were assessed at that point. The lozenge was given together with a zinc gluconate nasal spray, so the orotate lozenge cannot be isolated. This is the only randomized trial of zinc orotate in people, and it was negative. No trial has measured immune status, skin, hair, nail or oxidative stress outcomes with zinc orotate.

2
Editorial, not a trial: orotate research is magnesium focused
PubMed

Editorial review of orotic acid and magnesium orotate supplementation summarizing small cardiovascular studies

Cardiac patients in small magnesium orotate studies, not zinc orotate

Reported effects relate to orotic acid and the magnesium salt and the author called for further study; these findings provide no support for zinc orotate efficacy, which lacks dedicated human evidence of its own.

Side effects and drug interactions

Common Potential side effects

Gastrointestinal upset such as nausea can occur with zinc-containing supplements.
Prolonged high dose zinc can deplete copper: 50 mg/day as zinc gluconate for 10 weeks lowered erythrocyte copper zinc superoxide dismutase in healthy adult women. The adult upper limit for total zinc is 40 mg/day in the United States and 25 mg/day in the EU.
The orotate part of the molecule carries its own safety question. EFSA has twice declined to clear orotate mineral salts for food supplements, citing rat studies in which orotic acid promoted tumours in animals that had already been given a separate chemical carcinogen, and setting a no observed adverse effect level for orotic acid of 50 mg/kg body weight per day. Zinc orotate is not on the EU list of permitted zinc sources.
Marketing claims for superior absorption are unverified, so expectations should be modest.
Taking zinc with food can reduce stomach discomfort.

Important Drug interactions

Zinc reduces absorption of quinolone and tetracycline antibiotics; separate dosing by several hours.
Zinc can decrease absorption of penicillamine and some thyroid medications taken together.
Long-term high-dose zinc can lower copper status, potentially requiring monitoring.
High supplemental iron taken at the same time may compete with zinc for absorption.

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Frequently asked questions about Zinc Orotate

What is zinc orotate?

Zinc orotate is zinc bound to orotic acid, marketed as a highly absorbable zinc form. It is used like other zinc supplements for immune function, skin, and many enzyme systems.

Is zinc orotate well absorbed?

No human study has compared zinc orotate against another zinc salt. The one comparison in any species, in rabbits, found zinc orotate is poorly soluble and entered the blood more slowly than zinc sulfate, and EFSA's review of orotate salts judged its zinc bioavailability comparable to other sources rather than superior. Nothing supports the marketing claim of better absorption, and cheaper, better studied forms such as zinc sulfate, gluconate, citrate, picolinate and bisglycinate do the same job.

How much zinc orotate should I take?

Doses provide 15 to 30 mg of elemental zinc per day; check the label for elemental content. Avoid exceeding about 40 mg daily long-term without medical advice, since chronic high zinc can deplete copper.

Is zinc orotate safe?

The zinc part is well tolerated at typical doses; take it with a little food to avoid nausea, and avoid long term high doses that could affect copper balance, staying under 40 mg/day of elemental zinc from all sources. The orotate part is less settled: European food safety assessors have twice found the safety of orotate mineral salts unestablished because of unresolved questions about orotic acid, and zinc orotate is not on the EU list of permitted zinc sources for food supplements.

What is Zinc Orotate used for?

Zinc Orotate is researched primarily for Immune Support, Hair, Skin & Nails, and Antioxidant. Zinc orotate supplies zinc, an essential mineral that supports immune function, skin health, and hundreds of enzymes, and at about 16% elemental zinc a normal tablet delivers a full daily dose.

What is the recommended dosage of Zinc Orotate?

The clinically studied dose is No established dose; the one trial reported no benefit. Adult zinc targets are 8 to 11 mg/day of elemental zinc, and at about 16% zinc a 60 mg tablet supplies 10 mg. Always follow the product label and check with a healthcare provider for personal advice.

Is Zinc Orotate safe, and does it have side effects?

For most healthy adults, Zinc Orotate is well tolerated at studied doses. Reported effects can include: Gastrointestinal upset such as nausea can occur with zinc-containing supplements. Prolonged high dose zinc can deplete copper: 50 mg/day as zinc gluconate for 10 weeks lowered erythrocyte copper zinc superoxide dismutase in healthy adult women. It may also interact with some medications. Zinc Orotate is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Zinc Orotate interact with any medications?

Possible interactions include: Zinc reduces absorption of quinolone and tetracycline antibiotics; separate dosing by several hours. Zinc can decrease absorption of penicillamine and some thyroid medications taken together. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Zinc Orotate?

NutraSmarts rates the evidence for Zinc Orotate as Preliminary (1 out of 5). It is backed by 2 clinical trials and 7 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(7 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Rosenfeldt FL Metabolic supplementation with orotic acid and magnesium orotate Cardiovascular Drugs and Therapy. 1998;Cardiovasc Drugs Ther. 1998 Sep;12 Suppl 2:147-52 (editorial).PubMedUsed to support: An editorial, not a trial. It reviews orotic acid and magnesium orotate in cardiac patients, summarising small studies, and calls for further research. It concerns a different mineral salt in a different condition and reports nothing about zinc orotate.
  2. Eby GA, Halcomb WW Ineffectiveness of zinc gluconate nasal spray and zinc orotate lozenges in common-cold treatment: a double-blind, placebo-controlled clinical trial Alternative Therapies in Health and Medicine. 2006;Altern Ther Health Med. 2006 Jan-Feb;12(1):34-8 (randomized controlled trial).PubMedUsed to support: The only randomized trial of zinc orotate in people. Seventy-seven adults with active colds received zinc orotate lozenges plus a zinc gluconate nasal spray or placebo. At day 7, 10 of 16 zinc treated patients were symptom free versus 9 of 17 on placebo (P = 0.57), and treatment reduced neither the duration nor the severity of colds. Because the lozenge was given together with a nasal spray, the orotate lozenge cannot be isolated, and the analysed group was small.
  3. Andermann G, Dietz M The bioavailability and pharmacokinetics of three zinc salts: zinc pantothenate, zinc sulfate and zinc orotate European Journal of Drug Metabolism and Pharmacokinetics. 1982;Eur J Drug Metab Pharmacokinet. 1982;7(3):233-9 (animal pharmacokinetic study in rabbits).PubMedUsed to support: Compared zinc sulfate, zinc pantothenate and zinc orotate in rabbits after oral and injected dosing. The two soluble salts were bioequivalent. Zinc orotate, described as an insoluble organic salt, showed a slower absorption phase after oral dosing than the other two. This is an animal study and cannot establish what happens in people, but it is the only head-to-head absorption comparison of zinc orotate in any species and it does not support the claim that orotate improves zinc uptake.
  4. EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA); Turck D, Bohn T, Cámara Hurtado MM, Castenmiller J, De Henauw S, Hirsch-Ernst KI, Jos Á, Maciuk A, Mangelsdorf I, Mcnulty B, Naska A, Pentieva K, Siani A, Thies F, Cubadda F, Frenzel T, Gundert-Remy U, Marcon F, Prieto Maradona M, Neuhäuser-Berthold M, Siskos A, Wright M, Matijević L, McArdle H Safety of magnesium orotate dihydrate as a novel food pursuant to Regulation (EU) 2015/2283 and bioavailability of magnesium from this source in the context of Directive 2002/46/EC EFSA Journal. 2025;EFSA J. 2025 Jul 10;23(7):e9528 (regulatory scientific opinion).PubMedUsed to support: A European regulator's current assessment of the orotate ligand shared by all orotate mineral salts. It restates the earlier panel's no observed adverse effect level for orotic acid of 50 mg/kg body weight per day, derived from animal studies in which orotic acid promoted tumours in animals already exposed to a separate carcinogen, notes that no toxicology was supplied to resolve those questions, and concludes that safety cannot be established at the proposed use levels. It concerns a magnesium orotate application, not zinc orotate, but the concern is about orotic acid itself.
  5. Yadrick MK, Kenney MA, Winterfeldt EA Iron, copper, and zinc status: response to supplementation with zinc or zinc and iron in adult females The American Journal of Clinical Nutrition. 1989;Am J Clin Nutr. 1989 Jan;49(1):145-50.PubMedUsed to support: Healthy adult women took 50 mg of zinc per day as zinc gluconate for 10 weeks. Erythrocyte copper zinc superoxide dismutase fell significantly, as did serum ferritin and haematocrit, and adding iron corrected the iron effect but not the copper effect. This is the human evidence behind the warning that sustained high dose zinc, from any zinc salt, erodes copper status.
  6. Laconi E, Denda A, Rao PM, Rajalakshmi S, Pani P, Sarma DS Studies on liver tumor promotion in the rat by orotic acid: dose and minimum exposure time required for dietary orotic acid to promote hepatocarcinogenesis Carcinogenesis. 1993;Carcinogenesis. 1993 Sep;14(9):1771-5 (animal study in rats).PubMedUsed to support: The rat work underlying the regulatory concern about the orotate ligand. In rats first given a chemical carcinogen, dietary orotic acid at 0.5 to 1 percent of the diet promoted the growth of already initiated liver cells, and longer exposure raised the proportion developing liver tumours. Importantly, rats given orotic acid at 4 percent of the diet without the carcinogen developed no such lesions, so orotic acid promoted damage that another agent had started rather than starting it. This is a rodent study at dietary levels far above supplement intakes and says nothing about disease risk in people.
  7. Nault D, Machingo TA, Shipper AG, Antiporta DA, Hamel C, Nourouzpour S, Konstantinidis M, Phillips E, Lipski EA, Wieland LS Zinc for prevention and treatment of the common cold Cochrane Database of Systematic Reviews. 2024;Cochrane Database Syst Rev. 2024 May 9;5(5):CD014914 (systematic review and meta-analysis).PubMedUsed to support: A systematic review, not a trial. Across 34 randomized trials in 8,526 people, zinc showed little or no effect on whether a cold developed (RR 0.93, 95% CI 0.85 to 1.01; 9 studies, 1,449 participants; low certainty). Used as treatment, it may shorten a cold by about 2.4 days, but the certainty is low and the results varied widely between trials, and non-serious side effects were more common with zinc (RR 1.34, 95% CI 1.15 to 1.55; moderate certainty). Orotate lozenges are one of the forms this review covered.