Home Ingredients Calcium D-Glucarate
Women's Health

Calcium D-Glucarate

Evidence Level
Limited
2 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Calcium D-glucarate is the calcium salt of D-glucaric acid — a compound found naturally in fruits and vegetables (apples, oranges, grapefruit, cruciferous vegetables). Distinguished by its inhibition OF beta-glucuronidase — an enzyme that 'unconjugates' previously-detoxified hormones and toxins in the gut, allowing them to be reabsorbed. Used to support estrogen detoxification and clearance of glucuronidated metabolites. Often combined with DIM in women's health protocols.

Studied Dose 1,000-3,000 mg/day; integrative practitioners typically use 1,500 mg/day in divided doses
Active Compound D-glucaric acid (delivered as calcium salt)

Benefits

Beta-Glucuronidase Inhibition / Estrogen Clearance

Beta-glucuronidase enzyme (produced by gut bacteria) cleaves glucuronide conjugates — 'unconjugating' previously detoxified hormones, toxins, and drugs. Calcium D-glucarate inhibits this enzyme, supporting elimination of glucuronidated metabolites. Foundational mechanism for estrogen detoxification applications.

Supported by Trial 1, Trial 2

Estrogen Detoxification Support

Estrogens are conjugated with glucuronic acid in liver Phase II detoxification, then excreted via bile into intestine. Beta-glucuronidase can 'unconjugate' estrogens, allowing reabsorption (enterohepatic recirculation). Calcium D-glucarate inhibits this — supporting estrogen elimination. Used for hormonal balance protocols.

Supported by Trial 1, Trial 2

Toxin / Xenobiotic Clearance

Same mechanism applies to environmental toxins, drugs, and metabolic byproducts that undergo glucuronidation. Supports clearance of these substances.

Supported by Trial 1

Cancer Chemoprevention Research

Animal models show reduced tumor formation in carcinogen-exposed rats. Mechanism: enhanced detoxification and reduced beta-glucuronidase 'unconjugation' of carcinogens. Human clinical translation limited.

Supported by Trial 1

Modest Cholesterol Effects

Some animal evidence for cholesterol reduction. Limited human clinical evidence.

Supported by Trial 1

Mechanism of action

1

Beta-Glucuronidase Enzyme Inhibition

D-glucaric acid (and metabolite D-glucaro-1,4-lactone) inhibits beta-glucuronidase produced by gut bacteria (especially E. coli, certain Clostridia) and human cells. Maintains glucuronide conjugates intact for excretion rather than reabsorption.

2

Phase II Detoxification Support

Glucuronidation is major Phase II detoxification pathway in liver — calcium D-glucarate supports this pathway by preventing 'reversal' of glucuronidation in gut. Effective synergy with substances supporting glucuronidation itself.

3

Estrogen Enterohepatic Recirculation Reduction

Reduces reabsorption of estrogens that were conjugated for excretion. Lowers circulating estrogen burden over time. Supports hormonal balance.

4

Calcium Co-Delivery

Calcium D-glucarate provides modest calcium content as bonus — typical doses provide 300-600 mg elemental calcium daily (consider in total calcium intake).

Clinical trials

1
Calcium D-Glucarate for Estrogen Metabolism — Animal Studies

Multiple animal studies of calcium D-glucarate's effects on beta-glucuronidase activity, estrogen metabolism, and cancer chemoprevention.

Animal models.

Established beta-glucuronidase inhibition mechanism. Reduced mammary tumor incidence in carcinogen-exposed rats. Generated foundation for human clinical use.

2
Calcium D-Glucarate Human Pharmacokinetics

Phase 1 human study of calcium D-glucarate dosing, pharmacokinetics, and effects on beta-glucuronidase activity.

Healthy adults.

Demonstrated absorption, conversion to D-glucaro-1,4-lactone (active metabolite), and inhibition of beta-glucuronidase activity. Established human pharmacology basis.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated.
GI distress (constipation, gas).
Headache rare.
Calcium content — typical 1,500 mg daily dose provides ~300-600 mg elemental calcium; consider in total calcium intake; relevant for those at risk of hypercalcemia or kidney stones.
Theoretical reduced absorption of medications that depend on enterohepatic recirculation.

Important Drug interactions

Oral contraceptives — beta-glucuronidase inhibition may modestly reduce enterohepatic recirculation of estrogens; theoretical reduction in contraceptive efficacy (less concerning than DIM/I3C); consult.
Drugs subject to enterohepatic recirculation — theoretical effects on drug levels.
Calcium content — separate from iron, zinc, magnesium supplements; affects absorption.
Tetracyclines, fluoroquinolones — calcium reduces absorption; separate by 2 hours.
Levothyroxine — calcium reduces absorption; separate by 4 hours.
Mycophenolate (transplant medication) — undergoes enterohepatic recirculation; theoretical interaction; consult.

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Frequently asked questions about Calcium D-Glucarate

What is calcium D-glucarate used for?

Calcium D-glucarate is taken for its glucaric acid content, which is studied for supporting the body's detoxification and healthy hormone (especially estrogen) metabolism, not as a calcium source. The calcium is simply the carrier.

How does calcium D-glucarate work?

In the body it releases a compound that inhibits an enzyme called beta-glucuronidase, supporting glucuronidation, a key detox pathway that helps clear used hormones and toxins through the liver and gut. This is the basis for its use in estrogen-metabolism support.

How much calcium D-glucarate should I take?

Common doses are 500 to 1,500 mg per day, often split. Research is still developing, so follow product labeling. It is taken for hormone-metabolism and detox support rather than for its calcium.

Is calcium D-glucarate safe?

It is generally well tolerated in studies. Because it may speed the clearance of compounds processed through glucuronidation, it could theoretically affect levels of certain medications (including hormonal ones), so check with your doctor if you take prescriptions.

What is Calcium D-Glucarate?

Calcium D-glucarate is the calcium salt of D-glucaric acid — a compound found naturally in fruits and vegetables (apples, oranges, grapefruit, cruciferous vegetables).

What is the recommended dosage of Calcium D-Glucarate?

The clinically studied dose is 1,000-3,000 mg/day; integrative practitioners typically use 1,500 mg/day in divided doses Always follow the product label and check with a healthcare provider for personal advice.

Is Calcium D-Glucarate safe, and does it have side effects?

For most healthy adults, Calcium D-Glucarate is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. GI distress (constipation, gas). It may also interact with some medications. Calcium D-Glucarate 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 Calcium D-Glucarate interact with any medications?

Possible interactions include: Oral contraceptives — beta-glucuronidase inhibition may modestly reduce enterohepatic recirculation of estrogens; theoretical reduction in contraceptive efficacy (less concerning than DIM/I3C); consult. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Calcium D-Glucarate?

NutraSmarts rates the evidence for Calcium D-Glucarate as Limited (2 out of 5). It is backed by 2 clinical trials and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 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. Dwivedi C, Heck WJ, Downie AA, et al. Effect of calcium glucarate on beta-glucuronidase activity and glucarate content of certain vegetables and fruits. Biochem Med Metab Biol. 1990;43(2):83-92..PubMedUsed to support: Mechanistic study supporting beta-glucuronidase inhibition by calcium D-glucarate.