Milk Thistle has been marketed as a herbal supplement having a protecting benefits on the liver, they claim milk thistle can even regenerate the liver cells in most liver diseases such as cirrhosis (hardening of the liver), jaundice and hepatitis (inflammation of the liver), cholangitis (inflammation of bile ducts resulting in decreased bile flow). Milk Thistle is also marketed as a preventative medicine to protect each cell of the liver from incoming toxins and encourage the liver to cleanse itself of damaging substances, such as alcohol, drugs, medications, mercury and heavy metals. Milk thistle is also promoted as an agent which can cleanse and detoxify overburdened and stagnant livers, strengthen and tonify weak livers.
Milk thistle is also suggested to be used as a gentle and mild laxative, as it may be able to increase bile secretion and flow in the intestinal tract. This herb is also claimed to be able to lubricate and soften the stools to a mild laxative effect- a balance between constipation and diarrhea. However, scientific supports to these claims are limited. In the following section, we review what scientists found about milk thistle - benefits and side effects. _______________________________________________________________________________________
Health benefits of milk thistle Milk thistle has been used for centuries for the treatment of liver disease. Milk thistle appears to be safe and have multiple health benefits on various liver conditions; the available evidence on the mechanisms of action appears promising [1]. Traditionally, milk thistle is commonly used for liver cirrhosis, alcoholic hepatitis, alcoholic fatty liver, liver poisoning, and viral hepatitis.
Milk thistle key ingredients Milk thistle extracts are standardized to a concentration of 70-80% of flavone lignans including isosilybinin, silybinin, silychristin, and silydianin, which are collectively called silymarin. Silymarin may play a role in displacing toxins binding to the liver and causing the liver cells to regenerate at a faster rate.
Milk thistle is a flowering herb. Silymarin can be extracted from the seeds (fruit). The seeds are used to prepare capsules containing powdered herb or seed; extracts; and infusions (strong teas). [NCCAM] ______________________________________________________________________________________
MILK THISTLE EXTRACT HEALTH BENEFITS; RESEARCH FINDS
Milk thistle's protective effects on liver are well-known, milk thistle actually may have many other health benefits. Test-tube studies show that milk thistle may possibly be a potent anti-cancer agent. Further, milk thistle ingredients were found to have anti-inflammatory, cytoprotective, and anticarcinogenic effects and these beneficial effects are probably related to inhibition of activation of NF-kappa B and the kinases. [7] Here, we are going to highlight milk thistle benefits on different conditions:
Milk thistle may have benefits of anti-microbial activities Milk thistle ingredient, silybin, inhibited RNA and protein synthesis on gram-positive bacteria. [8]
Milk thistle ingredient is a strong anti-oxdative agent Silymarin reduced NO production at less than 300 ppm. [9]
Milk thistle may benefit people at risk of cardiovascular conditions Milk thistle and lecithin have found to have anti-atherosclerotic activity in rabbits. Milk thistle-phospholipid complex showed a strong anti-atherosclerotic activity. [10]
Milk thistle may benefit people at risk of various type of cancers Silymarin from milk thistle exerts chemopreventive effects against tumorigenicity by inhibiting endogenous tumor promoter TNF alpha. [11] Silibinin and silymarin, have shown the anticancer effects in different cancer cells in multiple studies:
BLADDER CANCER Silibinin modulates cyclin-dependent kinase inhibitors - cyclin-dependent kinases -cyclin cascade and activates caspase 3 causing growth inhibition and apoptotic death of human bladder transitional cell carcinoma cells. [12] In another study, silibinin decreased survivin levels and caspases-PARP cleavages, in accord with a strong apoptotic death and growth inhibition of Human bladder transitional-cell papilloma cells. [13] And, silymarin was found to be effective in preventing OH-BBN-induced bladder carcinogenesis in mice. [14]
BREAST CANCER An in vitro study has suggested a possible synergism between silibinin and conventional cytotoxic agents for breast cancer treatment. [15] Milk thistle extract may exert a strong anticarcinogenic effect against breast cancer involving inhibition the threshold kinase activities of cyclin-dependent kinases and associated cyclins, leading to a G1 arrest in cell cycle progression. [16].
COLON CANCER A study showed the chemopreventive ability of silymarin against chemically induced colon tumorigenesis.[17]
ENDOTHELIAL CELLS CANCER Silibinin can be a anti-cancer agent as it has the ability inhibit angiogenesis through induction of endothelial apoptosis via modulation of NF-kappaB, Bcl-2 family and caspases. [18] Silibinin toxicity to cancer cells is also found to involve the epidermal growth factor receptor signaling pathway. [19]
LUNG CANCER Milk thistle extracts containing Silibinin exerted a dose-dependent inhibitory effect on the invasion and motility of human lung cancer cells.[20]
LIVER CANCER Milk thistle may be useful in the prevention or treatment of liver dysfunction in patients undergoing anticancer therapy.[21]
PROSTATE CANCER In prostate cancer, silibinin exerts its anti-cancer effect probably via epidermal growth factor receptor, insulin-like growth factor receptor type I and nuclear factor kappa B signaling [23] Milk thistle extracts possess anticancer activities on human prostate carcinoma. Isosilybin A and B might be the most effective suppressors of prostate-specific antigen secretion by androgen-dependent LNCaP cells. Researchers suggested that milk thistle extracts enriched for isosilybin A or B might possess improved potency in prostate cancer prevention and treatment. [22] Finally, milk thistle silibinin was found to able to down regulate 5alpha-dihydrotestosterone, thus, milk thistle may be beneficial to prostate health. [23] There are a few more studies showing milk thistle benefits on prostate [24-32].
SKIN CANCER In studies of rats, milk thistle extracts provided substantial protection against different stages of UVB-induced carcinogenesis, possibly via its strong antioxidant properties. [33] In another study, topical treatment of silymarin inhibited 7,12-dimethylbenz(a)anthracene-initiated and several tumor promoters in mouse models. [34] There are two more studies showing the anti-tumor effects of milk thistle extracts on skin cancer: [35]
TONGUE CANCER Feeding of silymarin (500 p.p.m.) during the promotion phase of 4-NQO-induced rat tumorigenesis exerts chemopreventive ability against tongue squamous cell carcinoma through modification of phase II enzymes activity, cell proliferation, and/or PGE(2) content. [36]
Milk thistle may benefit animals with cholestasis Milk thistle prevents cholestasis induced by estrogens and taurolithocholate via inhibiting cAMP-phosphodiesterase. [38] In 1985, Koch HP reported that milk thistle was a very potent inhibitor of cyclic AMP phosphodiesterase. Milk thistle's constituents, silybin, silydianin and silychristin, are 12.66 to 52.06 times more active than theophylline. [37]
Milk thistle shows its benefits on diabetic animals Milk thistle extracts may be useful in treatment of non-insulin-dependent diabetes mellitus, as silibinin inhibits glucose-stimulated insulin release in vitro, while not affecting blood glucose concentration in vivo. [39]Aqueous extracts of milk thistle exhibit potent hypoglycaemic and anti-hyperglycaemic activities in normal and streptozotocin diabetic rats without affecting insulin secretion. [40] In a study, researchers treated diabetics with 200 mg of silymarin three times a day. After four months, patients had reductions in blood glucose levels. The results are very encouraging and the researchers planned to do further large multi-centre studies. [Milk thistle may help diabetics -study, Reuters, October 30, 2006.]
Randomized controlled trials were identified through electronic searches (MEDLINE, EMBASE and Cochrane Central Register of Controlled Trials) up until February 2011. Nine randomized, placebo-controlled trials (n=487 patients) were identified. Ipomoea batatas, Silybum marianum (milk thistle) and Trigonella foenum-graecum significantly improved glycemic control, whereas Cinnamomum cassia did not. [aa2]
Milk thistle may have benefits on heart. Milk thistle extract, silymarin, protects cardiomyocytes against doxorubicin-induced oxidative stress via cell membrane stabilization effect, radical scavenging and iron chelating potency. {41]
IMMUNE MODULATION A study of mice showed milk thistle silymarin could prevent UVB-induced immuno-suppression and oxidative stress probably by inhibiting the infiltration of leukocytes, and myeloperoxidase activity. [42]
A study demonstrated that milk thistle was immunostimulatory in vitro. Milk thistle increased lymphocyte proliferation in both mitogen and MLC assays. These effects of Milk Thistle were associated with an increase in interferon gamma, interleukin (IL)-4 and IL-10 cytokines in the MLC (table). This immunostimulatory effect increased in response to increasing doses of Milk Thistle. [43]
Milk thistle may benefit people at risk of liver diseases CIRRHOSIS A double blind study of 170 patients with cirrhosis demonstrated that silymarin treatment was effective in patients with alcoholic cirrhosis. [44] A study has suggested that milk thistle and S-adenosylmethionine may be effective in alcoholic cirrhosis. [45]
FIBROSIS Silymarin retarded the development of alcohol-induced hepatic fibrosis in 12 baboons, consistent with several positive clinical trials. [46]
INJURY The hepatoprotective properties of milk thistle extracts in acute and chronic liver injury is probably related to inhibition of leukotriene B (4) formation by silibinin. [47]
The protective effects of milk thistle on liver injury may be related to the recovery of the membrane fluidities of liver microsome and mitochondria [48]
HEPATITIS C A double-blinded trial of 141 subjects demonstrated that milk thistle extract, silymarin, could improve symptoms and general well-being of patients suffered from hepatitis C. [49] However, some researchers found that milk thistle extracts had no benefits on liver health. For instance, milk thistle extract was found to have no hepatoprotective effect on dairy cows. [50]
Osteoporosis Bone-remodeling imbalance induced by decreased osteoblastogenesis and increased bone resorption is known to cause skeletal diseases such as osteoporosis. Silibinin is the major active ingredient of milk thistle. Studies suggest that silibinin is a powerful antioxidant and has anti-hepatotoxic properties and anti-cancer effects against carcinoma cells. A recent study shows that silibinin had bone-forming and osteoprotective effects in in vitro cell systems of murine osteoblastic MC3T3-E1 cells and RAW 264.7 murine macrophages. Silibinin accelerated cell proliferation and promoted matrix mineralization by enhancing bone nodule formation by calcium deposits. [aa3]
Milk thistle may have protective effects on neural system In a cell study, silymarin significantly inhibited the LPS-induced activation of microglia and the production of inflammatory mediators, such as tumour necrosis factor-alpha and nitric oxide (NO), and reduced the damage to dopaminergic neurons.[51]
Milk thistle extract protected cultured rat hippocampal neurons against oxidative stress-induced cell death. [52] ______________________________________________________________________________________
MILK THISTLE SAFETY ISSUES
Milk thistle side effects Milk thistle side effects are usually mild and may involve stomach upset and diarrhea. Rash may be a result from touching milk thistle plants. Only a few cases of milk thistle side effect have been reported. High dose of milk thistle may stimulate inflammatory process (from a mice study). [61] Milk thistle can also produce allergic reactions, which tend to be more common among people who are allergic to plants in the same family (e.g. ragweed, chrysanthemium, marigold, and daisy}.
Milk Thistle Drug Interaction University of Maryland suggest not to use milk thistle if you are taking: antipsychotics, phenytoin(Dilantin), halothane, and birth control pills or hormone replacement therapy. Milk thistle may interact with allergy drugs -- such as fexofenadine (Allegra), statins, anti-anxiety drugs, anti-platelets, anti-coagulants, some cancer drugs and drugs borken down by liver. [UM]
For details, please, click milk thistle side effects. _____________________________________________________________________________________
CONCLUSION Milk thistle has been known for its protective effects on liver, while milk thistle may also be a potent anti-cancer agent. Milk thistle side effects are limited, but it may interact certain drug products. Users must discuss with their doctors before taking milk thistle. --
Milk Thistle Benefit zhion@zhion.com October 18, 2011
Different people may experience different side effects and benefits of a product. You are encouraged to report adverse side effects to FDA, its website is www.fda.gov., or report the adverse side effects to the manufacturer, you should be able to find the contact information on the label.
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