CDG stands for Calcium D-Glucarate, a supplement form of glucaric acid, a compound found naturally in fruits and vegetables like oranges, broccoli, and apples. Its primary role in the body is straightforward: it helps your liver finish the job of flushing out used hormones and environmental toxins by blocking an enzyme that would otherwise pull them back into circulation. Most people encounter CDG while researching estrogen balance, liver support, or hormone-related health concerns.
How CDG Works in Your Body
Your liver processes waste in two main phases. In the second phase, it attaches a molecule called glucuronic acid to toxins, used-up hormones (including estrogen), and other substances the body wants to eliminate. This bundling process, called glucuronidation, essentially tags these compounds for removal through bile and urine.
The problem is an enzyme called beta-glucuronidase, produced by bacteria in your gut, that can undo this tagging. When beta-glucuronidase breaks the bond between the toxin and glucuronic acid, the substance gets reabsorbed into your body instead of leaving it. This means hormones and toxins that were supposed to be excreted end up recirculating.
CDG competitively inhibits beta-glucuronidase. By blocking this enzyme, it allows tagged toxins and hormones to stay bundled and continue their exit from the body. Research published in the journal Nutrients showed that supplementation significantly reduces the unbundling of toxic substances in a dose-dependent manner, meaning higher doses produced stronger effects on keeping those waste products moving out.
CDG and Estrogen Balance
The connection between CDG and estrogen is the most common reason people seek out this supplement. When your body finishes using estrogen, the liver tags it for removal through glucuronidation. If beta-glucuronidase activity is high, that estrogen gets untagged and reabsorbed, effectively raising your circulating estrogen levels beyond what your body intended.
By keeping beta-glucuronidase in check, CDG helps ensure that once estrogen is processed and tagged for elimination, it actually leaves. This is why it’s often described as supporting estrogen “clearance” rather than directly lowering estrogen production. Your body still makes the estrogen it needs. CDG simply prevents already-processed estrogen from sneaking back into the bloodstream.
Elevated beta-glucuronidase activity has been associated with increased risk for hormone-dependent cancers, including breast, prostate, and colon cancers. While animal studies and mechanistic research are promising, clinical trials in humans are still limited. A review in Preventive Medicine outlined the rationale for using calcium glucarate as a chemopreventive agent in breast cancer, noting its dual ability to shift the hormonal environment and support the removal of environmental toxins that may contribute to cancer risk.
Liver and Detoxification Support
CDG’s benefits extend beyond hormones. The same glucuronidation pathway handles a wide range of substances your body wants to eliminate: environmental pollutants, certain medications, and byproducts of normal metabolism. When beta-glucuronidase is overactive, it doesn’t just recirculate estrogen. It also sends toxins back to the liver, increasing the toxic load on liver cells.
Computational modeling research found that glucaric acid plays a protective role for the liver by lowering levels of unbundled toxic compounds that promote liver damage. It also reduces oxidative stress in liver cells and decreases cell death. The overall effect is that the liver can function more efficiently when it isn’t being forced to reprocess the same toxins repeatedly. Think of CDG as preventing your liver from having to do the same job twice.
CDG vs. DIM for Estrogen Support
If you’ve been researching estrogen balance, you’ve likely also come across DIM (diindolylmethane, a compound from cruciferous vegetables). The two supplements work at different stages of estrogen processing and are sometimes taken together.
- DIM works earlier in the process, encouraging your body to convert stronger forms of estrogen into weaker, more beneficial metabolites. It changes which type of estrogen your body produces.
- CDG works later in the process, ensuring that estrogen metabolites tagged for removal are actually excreted rather than reabsorbed. It supports the elimination step.
Because they target different stages, some practitioners recommend combining them for a more complete approach: DIM to improve how estrogen is metabolized, and CDG to make sure those metabolites leave the body.
Food Sources of Glucaric Acid
Glucaric acid occurs naturally in several fruits and vegetables, though in relatively small amounts. Oranges contain the highest concentrations measured in food studies, at roughly 4.5 mg per 100 grams. Broccoli and potatoes sit at the lower end, around 1.1 to 1.7 mg per 100 grams. Apples, grapefruit, and cruciferous vegetables also contain modest amounts.
For perspective, typical CDG supplements provide 500 to 1,500 mg per capsule. You’d need to eat enormous quantities of these foods to match even a single supplement dose, which is why people turn to the concentrated form.
Typical Dosages
CDG supplements generally come in capsules ranging from 500 mg to 1,500 mg. Many supplement manufacturers suggest 500 mg once or twice daily for general support, with higher doses (up to 3,000 mg daily, split into multiple doses) sometimes used for more targeted hormonal goals. There is no officially established recommended daily intake, and optimal dosing likely varies depending on individual factors like body weight, hormone levels, and what you’re trying to address.
Side Effects and Interactions
CDG is generally well tolerated. Side effects are uncommon, but some people report mild digestive discomfort, particularly at higher doses.
The most important consideration is drug interactions. Because CDG enhances the body’s ability to eliminate substances through glucuronidation, it can potentially speed up the clearance of medications that are processed through the same liver pathway. This could reduce the effectiveness of those drugs. If you take prescription medications that are metabolized by the liver, this interaction is worth discussing with a pharmacist or prescriber, especially with hormone-based medications like birth control or hormone replacement therapy, where faster clearance could directly undermine the drug’s purpose.
CDG may also lower estrogen levels enough to matter for people who are already low in estrogen, such as postmenopausal women not on hormone therapy. The effect is not dramatic in most people, but it’s worth being aware of if estrogen deficiency is already a concern.