Milk Thistle - Composition, Uses, and Side Effects

What Is Milk Thistle?

After its religious significance, the milk thistle is called the Mary or Holy thistle. Scientifically, it is called Silybum marianum. It has prickly leaves with white veins on them and purple flowers. Ancient Greeks used it as an herbal remedy to treat abdominal issues related to the liver, kidney, and gallbladder. Due to these benefits, several scientific studies have been carried out, but the results of human studies are mixed. The main ingredient of milk thistle is Silymarin, obtained from the plant's seeds. It is widely used in the pharmaceutical industry as a supplement for treating various ailments. It is commercially modified as standardized preparations containing 70 to 80 percent ingredients, marketed as oral capsules, tablets, and liquid extract.

What Does Milk Thistle Comprise?

Silymarin – the active ingredient in milk thistle, contains many flavonoids like silibinin, Silydianin, and silicristin, and their flavonoid precursor, taxifolin, which has been claimed to reverse the damage to hepatic cells caused by alcohol, drugs, medications and other toxic substances. Silymarin also has a protective effect on liver cells, particularly the new ones, preventing their destruction. In addition, it is claimed to possess antioxidant, antiviral, and anti-inflammatory properties; that is why it is specifically used to cure cirrhosis, jaundice, hepatitis, and gallbladder diseases.

What Is Milk Thistle Used For?

Milk thistle has been known to have a myriad of health benefits. Due to this, the different parts of the plant are used for various purposes. Therefore, its health benefits are as follows:

• Improves Liver Health: Silymarin in milk thistle decreases the production of free radicals and serves as an antioxidant. This helps in liver detoxification and enhances its functioning and overall health.

• Assists in Skin Health: Milk thistle has antioxidant, anti-inflammatory, and anti-aging actions, providing better dermatological health. It is used in creams for topical application and protects from the tanning effects of the sun.

• Lowers Cholesterol Levels: Oral consumption of milk thistle aids in decreasing blood cholesterol levels, imparts better heart health, and prevents stroke.

• Supports Weight Loss: Milk thistle may also effectively reduce body weight when taken orally.

• Decreases Insulin Resistance: Milk thistle has been claimed to reduce insulin resistance in type 2 diabetic patients and obese individuals. It may also make a permanent place for itself in diabetes management in the future.

• Relieves Allergic Symptoms: Silymarin has an anti-inflammatory action, which is particularly helpful in eliminating asthma manifestations. It can also control symptoms by regulating immune responses.

• Limits Cancer Spread: The National Institutes of Health (NIH), U.S.A, has found that milk thistle intake can hamper the spread of cancerous cells and tumor growth and may even halt the disease in certain types. It also enhances the efficacy of chemotherapeutic drugs and may lower the adverse effects of cancer treatment. It is beneficial in the following types:

• Prostate cancer.

• Breast cancer.

• Cervical cancer.

• Leukemia.

• Skin cancer.

• Colorectal cancer.

However, milk thistle has not yet been approved for cancer treatment by the FDA.

• Promote Bone Health: Milk thistle supports bone health by preventing bone loss, primarily caused by estrogen deficiency in women.

• Enhances Cognitive Functions: Milk thistle may help prevent neurodegenerative conditions like Alzheimer's disease and improve cognitive functions by increasing resistance to oxidative stress.

• Upgrades Immune Response: Due to the anti-inflammatory action of Silymarin, milk thistle improves the body's immune response and suppresses an overactive immune system in chronic inflammatory conditions.

How to Consume Milk Thistle?

Milk thistle is commonly marketed as a supplement in tablets, capsules, etc. However, no recommended dosage has been set for its consumption in children and adults. So, following the manufacturer's instructions on the package is advised. It is also obtainable as tea; its intake should be less than six cups daily.

What Are the Side Effects of Milk Thistle?

Although milk thistle is safe for consumption. However, when taken with other herbs, supplements, or medications, it may cause specific adverse effects, usually mild in intensity. They are listed as:

• Stomach upset.

• Diarrhea.

• Nausea and vomiting.

• Rash.

• Heartburn.

Is Milk Thistle Safe for All?

Like all other herbs and supplements, milk thistle is not safe for everyone, and the following groups of people should avoid it:

• Pregnant or lactating women.

• People with a history of hormone-related cancers like breast and uterine cancer in females and prostate cancer in males.

• Those allergic to ragweed, chrysanthemums, marigolds, chamomile, yarrow, or daisies.

Which Medications to Avoid With Milk Thistle?

The liver is the metabolism site for many of the routinely used drugs. Due to the effects of milk thistle on the liver, there are high chances of having drug reactions on consuming milk thistle. So, it is recommended to consult a doctor before starting the intake of milk thistle if another drug is being taken. However, the interactions with certain drugs are already known. Such medications are mentioned below:

• Antipsychotics: Comprise butyrophenones (such as Haloperidol) and phenothiazines (like Chlorpromazine, Fluphenazine, and Promethazine).

• Phenytoin (Dilantin): An anti-epileptic drug used to treat seizures.

• Halothane: A drug used to induce or maintain general anesthesia.

• Oral contraceptive pills or hormone replacement therapy.

Does Milk Thistle Have Any Drug Interactions?

The following drugs interact with milk thistle intake, as similar liver enzymes metabolize these medications and milk thistle.

• Allergy drugs like Fexofenadine.

• Drugs for treating high cholesterol levels involve statins, such as Lovastatin.

• Anti-anxiety drugs: Including Alprazolam, Diazepam, and Lorazepam.

• Antiplatelet and anticoagulant drugs (blood thinners): Comprising Clopidogrel and Warfarin.

• Cancer-specific drugs like Raloxifene are used in breast cancer and osteoporosis.

• Simeprevir: It is used to treat hepatitis C.

• Sirolimus: It is an immunosuppressant.

• Diabetes medications.

Conclusion:

Milk thistle has important health benefits, especially for liver and gallbladder issues. However, more evidence is needed to prove its efficacy and safe use. It also interacts with several drugs, causing severe complications. So, it should be taken only on a doctor's recommendation.