# Zinc Orotate Dihydrate **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/zinc-orotate-dihydrate **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-30 **Evidence Score:** 2 / 10 **Category:** Mineral **Also Known As:** Zinc bis(orotate) dihydrate, Zinc orotate 2H₂O, Dihydrate zinc orotate, Zinc orotic acid complex dihydrate, C₁₀H₁₀N₄O₁₀Zn, Zinc orotate·2H₂O ## Overview Zinc orotate dihydrate is a chelated form of zinc bound to orotic acid (vitamin B13) with two water molecules, theorized to enhance cellular zinc delivery via orotic acid's role in pyrimidine biosynthesis pathways. It supplies elemental zinc, an essential cofactor for over 300 enzymes including carbonic anhydrase, DNA polymerase, and superoxide dismutase. ## Health Benefits • No health benefits can be cited as no human clinical trials, RCTs, or meta-analyses for zinc orotate dihydrate were found in the research • The research dossier provides no evidence of therapeutic effects • No studies with health outcomes are available to reference • No clinical evidence exists in the provided sources • Benefits cannot be determined from the available research data ## Mechanism of Action Zinc orotate dihydrate dissociates in the gastrointestinal tract, releasing zinc ions and orotic acid; the chelate bond is proposed to facilitate passive diffusion across intestinal enterocyte membranes via lipid solubility, potentially improving absorption over inorganic zinc salts. Once absorbed, zinc acts as a structural cofactor in zinc-finger transcription factors (e.g., Sp1, GATA family) and catalytic center of metalloenzymes including matrix metalloproteinases and alcohol dehydrogenase. Orotic acid independently enters pyrimidine synthesis as a precursor to UMP via the enzyme UMP synthase, though whether this pathway meaningfully augments zinc transport remains undemonstrated in controlled human trials. ## Clinical Summary No human clinical trials, randomized controlled trials, or meta-analyses specifically examining zinc orotate dihydrate as an isolated compound have been identified in the peer-reviewed literature as of 2024. General zinc supplementation research—using forms such as zinc gluconate, zinc sulfate, and zinc acetate—demonstrates benefits for [immune function](/ingredients/condition/immune-support), wound healing, and [testosterone](/ingredients/condition/hormonal) maintenance in deficient populations, but these findings cannot be directly extrapolated to zinc orotate dihydrate without form-specific bioavailability data. One small comparative study by Eby (2004, not peer-reviewed RCT) claimed superior bioavailability for zinc orotate, but no independent replication exists. The evidence base for this specific compound is therefore insufficient to support efficacy claims. ## Nutritional Profile Zinc Orotate Dihydrate is a chelated zinc salt in which zinc is bound to orotic acid (vitamin B13) with two water molecules incorporated into the crystal structure. Elemental zinc content: approximately 17-20% by molecular weight (zinc orotate dihydrate molecular weight ~461 g/mol; zinc atomic weight ~65.4 g/mol). Orotic acid content: approximately 2 orotate molecules per zinc ion, constituting the majority of remaining molecular mass. The dihydrate component contributes 2 water molecules per formula unit. As a mineral supplement, it contains no meaningful macronutrients (protein, fat, carbohydrate), no caloric value, and no vitamins. The chelated form theoretically enhances zinc bioavailability compared to inorganic zinc salts (e.g., zinc oxide) due to improved gastrointestinal stability and reduced competition with other minerals for absorption transporters; however, direct comparative bioavailability data from human clinical trials specific to zinc orotate dihydrate are not established in available research sources. Zinc itself is an essential trace mineral involved in enzymatic cofactor roles (>300 enzymes), immune signaling, protein synthesis, and DNA [metabolism](/ingredients/condition/weight-management), with a recommended dietary allowance of 8-11 mg elemental zinc/day for adults. Orotic acid is a naturally occurring pyrimidine precursor compound found in small amounts in dairy products. ## Dosage & Preparation No clinically studied dosage ranges or standardization details are reported in the available research. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Zinc orotate dihydrate carries the same general safety profile as other zinc supplements; the tolerable upper intake level (UL) for elemental zinc is 40 mg/day for adults, with acute toxicity (nausea, vomiting, metallic taste) reported above approximately 50 mg elemental zinc. Chronic excess zinc supplementation (>50 mg/day long-term) can antagonize copper absorption by inducing intestinal metallothionein, potentially causing copper-deficiency anemia and neurological symptoms. Drug interactions include reduced absorption of fluoroquinolone and tetracycline antibiotics when taken concurrently, and zinc may reduce the efficacy of penicillamine. Pregnancy safety follows standard zinc guidelines (RDA 11 mg/day; UL 40 mg/day), and the orotic acid component raises a theoretical concern since high-dose orotic acid has shown hepatotoxic effects in animal models, though no such effects have been documented at supplemental doses in humans. ## Scientific Research No human clinical trials, RCTs, or meta-analyses for zinc orotate dihydrate were identified in the research sources. No PubMed PMIDs, study designs, sample sizes, or clinical outcomes are available in the provided literature. ## Historical & Cultural Context No historical or traditional medicine uses are documented in the research sources. The compound appears to be a modern synthetic creation with no traditional usage history. ## Synergistic Combinations Other zinc forms, vitamin C, quercetin, copper, magnesium ## Frequently Asked Questions ### What is the elemental zinc content of zinc orotate dihydrate? Zinc orotate dihydrate (molecular formula Zn(C5H3N2O4)2·2H2O, molecular weight ~481 g/mol) contains approximately 13.6% elemental zinc by weight. A typical 100 mg tablet of zinc orotate dihydrate therefore delivers roughly 13–14 mg of elemental zinc, making dose calculation essential to avoid exceeding the 40 mg/day adult upper tolerable intake level. ### Is zinc orotate dihydrate better absorbed than zinc gluconate or zinc sulfate? The claim that zinc orotate has superior bioavailability is frequently repeated in marketing materials but lacks robust human clinical evidence; no peer-reviewed, independently replicated pharmacokinetic trials directly comparing zinc orotate dihydrate to zinc gluconate or zinc sulfate in humans have been published. The hypothesis rests on the chelation theory that lipid-soluble orotate complexes cross intestinal membranes more efficiently, but this remains unverified. Until controlled bioavailability studies are conducted, consumers cannot reliably determine if any absorption advantage exists. ### How much zinc orotate dihydrate should I take per day? There is no established evidence-based dosing protocol specific to zinc orotate dihydrate due to the absence of clinical trials. General zinc supplementation guidance suggests 8–11 mg elemental zinc daily from dietary sources and supplements combined for adult maintenance, with therapeutic doses in deficiency studies using 25–45 mg elemental zinc per day under medical supervision. Given zinc orotate dihydrate's ~13.6% elemental zinc content, a 100–150 mg daily dose would approximate 14–20 mg elemental zinc, staying below the 40 mg/day upper limit. ### Can zinc orotate dihydrate interact with medications? Yes, zinc ions from zinc orotate dihydrate can chelate with fluoroquinolone antibiotics (e.g., ciprofloxacin, levofloxacin) and tetracyclines (e.g., doxycycline), forming insoluble complexes that reduce antibiotic oral bioavailability by up to 50%; these should be taken at least 2 hours apart. Zinc also reduces absorption of penicillamine (used in rheumatoid arthritis and Wilson's disease) and may modestly interfere with iron absorption when taken simultaneously at high doses. Individuals on diuretics such as thiazides should note that these medications increase urinary zinc excretion, potentially altering net zinc status. ### Is orotic acid in zinc orotate dihydrate safe? Orotic acid at supplemental doses co-delivered with zinc orotate is generally considered safe in humans; the orotic acid content in a standard zinc orotate supplement dose is far below levels associated with harm. High-dose isolated orotic acid (several grams per day) caused fatty liver and growth inhibition in rodent studies, but these findings have not translated to human toxicity at typical supplemental exposures. No specific safety data exist for zinc orotate dihydrate's orotic acid component in pregnant women, so caution and medical consultation are advisable during pregnancy. ### What is orotic acid and why is it paired with zinc in this supplement form? Orotic acid is a naturally occurring compound involved in nucleotide synthesis and energy metabolism. In zinc orotate dihydrate, orotic acid serves as the carrier molecule that binds to zinc, creating this particular mineral form for supplementation purposes. ### How does zinc orotate dihydrate compare to other common zinc supplement forms available? Zinc orotate dihydrate is one of several zinc forms on the market, alongside zinc gluconate, zinc sulfate, zinc citrate, and zinc picolinate. While different forms may vary in elemental zinc content and theoretical absorption profiles, direct comparative effectiveness data between these forms remains limited in clinical research. ### What should I know about the stability and storage of zinc orotate dihydrate supplements? Zinc orotate dihydrate supplements should be stored in a cool, dry place away from moisture and direct sunlight to maintain stability, as humidity can affect the dihydrate form. Always check the expiration date on the product label and follow the manufacturer's storage instructions for optimal potency. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*