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<script type="text/javascript" src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.boots.min.js"> </script><title>Green Tea - Drugs and Lactation Database (LactMed®) - NCBI Bookshelf</title>
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<meta name="citation_inbook_title" content="Drugs and Lactation Database (LactMed®) [Internet]">
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<meta name="citation_title" content="Green Tea">
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<meta name="citation_publisher" content="National Institute of Child Health and Human Development">
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<meta name="citation_date" content="2025/01/15">
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<meta name="citation_pmid" content="30000907">
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<meta name="citation_fulltext_html_url" content="https://www.ncbi.nlm.nih.gov/books/NBK501847/">
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<meta name="citation_keywords" content="Camellia sinensis">
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<meta name="citation_keywords" content="Camellia thea">
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<meta name="citation_keywords" content="Camellia theifera">
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<meta name="citation_keywords" content="Thea bohea">
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<meta name="citation_keywords" content="Thea sinensis">
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<meta name="citation_keywords" content="Thea viridis">
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<meta name="citation_keywords" content="Benifuuki">
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<meta name="citation_keywords" content="CPTV">
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<meta name="citation_keywords" content="EGCG">
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<meta name="citation_keywords" content="Epigallo Catechin Gallate">
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<meta name="citation_keywords" content="Épigallo-Catéchine Gallate">
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<meta name="citation_keywords" content="Epigallocatechin Gallate">
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<meta name="citation_keywords" content="Extrait de Thé Vert">
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<meta name="citation_keywords" content="Extrait de Camellia Sinensis">
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<meta name="citation_keywords" content="Extrait de Thé">
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<meta name="citation_keywords" content="Extrait de Thea Sinensis">
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<meta name="citation_keywords" content="Japanese Sencha Green Tea">
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<meta name="citation_keywords" content="Té Verde">
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<meta name="citation_keywords" content="Thé">
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<meta name="citation_keywords" content="Thé de Camillia">
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<meta name="citation_keywords" content="Thé Japonais">
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<meta name="citation_keywords" content="Thé Vert de Yame">
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<meta name="citation_keywords" content="Thé Vert">
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<meta name="citation_keywords" content="Thé Vert Sensha">
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<meta name="citation_keywords" content="Yabukita">
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<meta name="citation_keywords" content="Yame Green Tea">
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<meta name="citation_keywords" content="Yame Tea">
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<meta name="DC.Title" content="Green Tea">
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<meta name="DC.Date" content="2025/01/15">
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<meta name="description" content="Green tea (Camellia sinensis) contains caffeine, polyphenols (e.g., quercetin), and tannins. Fussiness, jitteriness and poor sleep patterns have been reported in the infants of mothers with very high caffeine intakes (see the LactMed record on caffeine for details). Giving tea directly to infants can interfere with iron absorption and cause anemia,[1] but anemia in breastfed infants has not been reported with maternal tea ingestion. Application of wet tea bags to the nipples has been studied as a method of reducing nipple pain during the first few days of nursing. Two small, moderately well-controlled studies found a positive effect of the tea bags, but warm water compresses were as at least as effective as tea bags.[2,3] No studies were found that examined the use of oral green tea extract, topical application of green tea extract to the nipples, or to the topical product Veregren applied to genital warts during breastfeeding. Topical products applied away from the breast should pose negligible risk for the breastfed infant. Green tea is reportedly used to increase milk supply by some mothers in Türkiye.[4]">
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<meta name="og:description" content="Green tea (Camellia sinensis) contains caffeine, polyphenols (e.g., quercetin), and tannins. Fussiness, jitteriness and poor sleep patterns have been reported in the infants of mothers with very high caffeine intakes (see the LactMed record on caffeine for details). Giving tea directly to infants can interfere with iron absorption and cause anemia,[1] but anemia in breastfed infants has not been reported with maternal tea ingestion. Application of wet tea bags to the nipples has been studied as a method of reducing nipple pain during the first few days of nursing. Two small, moderately well-controlled studies found a positive effect of the tea bags, but warm water compresses were as at least as effective as tea bags.[2,3] No studies were found that examined the use of oral green tea extract, topical application of green tea extract to the nipples, or to the topical product Veregren applied to genital warts during breastfeeding. Topical products applied away from the breast should pose negligible risk for the breastfed infant. Green tea is reportedly used to increase milk supply by some mothers in Türkiye.[4]">
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class="wsprkl btn" title="Jump to next match">▶</a></nav></nav></div><div id="jr-epub-interstitial" class="hidden"></div><div id="jr-content"><article data-type="main"><div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><div class="fm-sec"><h1 id="_NBK501847_"><span class="title" itemprop="name">Green Tea</span></h1><p class="fm-aai"><a href="#_NBK501847_pubdet_">Publication Details</a></p><p><em>Estimated reading time: 3 minutes</em></p></div></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><div id="LM931.Drug_Levels_and_Effects"><h2 id="_LM931_Drug_Levels_and_Effects_">Drug Levels and Effects</h2><div id="LM931.Summary_of_Use_during_Lactation"><h3>Summary of Use during Lactation</h3><p>Green tea (<i>Camellia sinensis</i>) contains caffeine, polyphenols (e.g., quercetin), and tannins. Fussiness, jitteriness and poor sleep patterns have been reported in the infants of mothers with very high caffeine intakes (see the LactMed record on <a href="/books/n/lactmed/LM582/?report=reader">caffeine</a> for details). Giving tea directly to infants can interfere with iron absorption and cause anemia,[<a class="bibr" href="#LM931.REF.1" rid="LM931.REF.1">1</a>] but anemia in breastfed infants has not been reported with maternal tea ingestion. Application of wet tea bags to the nipples has been studied as a method of reducing nipple pain during the first few days of nursing. Two small, moderately well-controlled studies found a positive effect of the tea bags, but warm water compresses were as at least as effective as tea bags.[<a class="bibr" href="#LM931.REF.2" rid="LM931.REF.2">2</a>,<a class="bibr" href="#LM931.REF.3" rid="LM931.REF.3">3</a>] No studies were found that examined the use of oral green tea extract, topical application of green tea extract to the nipples, or to the topical product Veregren applied to genital warts during breastfeeding. Topical products applied away from the breast should pose negligible risk for the breastfed infant. Green tea is reportedly used to increase milk supply by some mothers in Türkiye.[<a class="bibr" href="#LM931.REF.4" rid="LM931.REF.4">4</a>]</p><p>Dietary supplements do not require extensive pre-marketing approval from the U.S. Food and Drug Administration. Manufacturers are responsible to ensure the safety, but do not need to <i>prove</i> the safety and effectiveness of dietary supplements before they are marketed. Dietary supplements may contain multiple ingredients, and differences are often found between labeled and actual ingredients or their amounts. A manufacturer may contract with an independent organization to verify the quality of a product or its ingredients, but that does <i>not</i> certify the safety or effectiveness of a product. Because of the above issues, clinical testing results on one product may not be applicable to other products. More detailed information <a href="/books/n/lactmed/LactMedDietarySupps/?report=reader">about dietary supplements</a> is available elsewhere on the LactMed Web site.</p></div><div id="LM931.Drug_Levels"><h3>Drug Levels</h3><p>Caffeine is excreted into breastmilk. Refer to the LactMed record on <a href="/books/n/lactmed/LM582/?report=reader">caffeine</a> for details. No components of green tea besides caffeine have been measured in milk after its ingestion, but some have been measured after the ingestion of other foods.</p><p><i>Maternal Levels.</i> Quercetin can be found in breastmilk of mothers with normal diets.[<a class="bibr" href="#LM931.REF.5" rid="LM931.REF.5">5</a>] Milk samples from 17 nursing mothers on uncontrolled diets were taken at 1, 4 and 13 weeks postpartum at times between 10 am and 1 pm. Average quercetin levels in breastmilk were 48 nmol/L at week 1, 60 nmol/L at week 4 and 51 nmol/L at week 13. Because of the uncontrolled diet and varying sampling times, the range of values among individuals was large.[<a class="bibr" href="#LM931.REF.6" rid="LM931.REF.6">6</a>]</p><p>Quercetin was measured in the milk of 11 mothers after they received an onion soup that contained either 0.8 or 1 mg/kg of quercetin glucosides. A baseline milk sample was obtained after a 5-day low-quercetin diet, and 7 milk samples were obtained over the 48 hours following soup ingestion. Baseline total (from conjugated and unconjugated) quercetin in breastmilk averaged 45 nmol/L. An average peak milk quercetin level of 68 nmol/L was attained at an average of 11.9 hours after the soup meal. The average half-life of quercetin in breastmilk was 50.3 hours.[<a class="bibr" href="#LM931.REF.7" rid="LM931.REF.7">7</a>]</p><p><i>Infant Levels.</i> Relevant published information was not found as of the revision date.</p></div><div id="LM931.Effects_in_Breastfed_Infants"><h3>Effects in Breastfed Infants</h3><p>Relevant published information was not found as of the revision date.</p></div><div id="LM931.Effects_on_Lactation_and_Breastmil"><h3>Effects on Lactation and Breastmilk</h3><p>Relevant published information was not found as of the revision date.</p></div><div id="LM931.References"><h3>References</h3><dl class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.</dt><dd><div class="bk_ref" id="LM931.REF.1">Merhav
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H, Amitai
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Y, Palti
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H, et al.
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Tea drinking and microcytic anemia in infants.
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Am J Clin Nutr
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1985;41:1210-3.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/4003328" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 4003328</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>2.</dt><dd><div class="bk_ref" id="LM931.REF.2">Buchko
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BL, Pugh
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LC, Bishop
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BA, et al.
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Comfort measures in breastfeeding, primiparous women.
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J Obstet Gynecol Neonatal Nurs
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1994;23:46-52.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/8176527" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8176527</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>3.</dt><dd><div class="bk_ref" id="LM931.REF.3">Lavergne
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NA. Does application of tea bags to sore nipples while breastfeeding provide effective relief?
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J Obstet Gynecol Neonatal Nurs
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1997;26:53-8.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/9017547" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 9017547</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>4.</dt><dd><div class="bk_ref" id="LM931.REF.4">Kaygusuz
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M, Gümüştakım
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RŞ, Kuş
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C, et al.
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TCM use in pregnant women and nursing mothers: A study from Turkey.
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Complement Ther Clin Pract
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2021;42:101300.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/33412511" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 33412511</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>5.</dt><dd><div class="bk_ref" id="LM931.REF.5">Williamson
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G, Clifford
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MN. A critical examination of human data for the biological activity of quercetin and its phase-2 conjugates.
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Crit Rev Food Sci Nutr
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2024:1-37.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/38189312" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 38189312</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>6.</dt><dd><div class="bk_ref" id="LM931.REF.6">Song
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BJ, Jouni
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ZE, Ferruzzi
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MG. Assessment of phytochemical content in human milk during different stages of lactation.
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Nutrition
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2013;29:195-202.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/23237648" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 23237648</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>7.</dt><dd><div class="bk_ref" id="LM931.REF.7">Romaszko
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E, Wiczkowski
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W, Romaszko
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J, et al.
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Exposure of breastfed infants to quercetin after consumption of a single meal rich in quercetin by their mothers.
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Mol Nutr Food Res
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2014;58:221-8.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/23963751" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 23963751</span></a>]</div></dd></dl></dl></div></div><div id="LM931.Substance_Identification"><h2 id="_LM931_Substance_Identification_">Substance Identification</h2><div id="LM931.Substance_Name"><h3>Substance Name</h3><p>Green Tea</p></div><div id="LM931.Scientific_Name"><h3>Scientific Name</h3><p>Camellia sinensis</p></div><div id="LM931.Drug_Class"><h3>Drug Class</h3><p>Breast Feeding</p><p>Lactation</p><p>Milk, Human</p><p>Complementary Therapies</p><p>Food</p><p>Phytotherapy</p><p>Plants, Medicinal</p></div></div><div><dl class="temp-labeled-list small"><dl class="bkr_refwrap"><dt></dt><dd><div><p class="no_top_margin"><p><b>Disclaimer: </b>Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.</p></p></div></dd></dl></dl></div><div id="bk_toc_contnr"></div></div></div><div class="fm-sec"><h2 id="_NBK501847_pubdet_">Publication Details</h2><h3>Publication History</h3><p class="small">Last Revision: <span itemprop="dateModified">January 15, 2025</span>.</p><h3>Copyright</h3><div><div class="half_rhythm"><a href="/books/about/copyright/">Copyright Notice</a><p class="small"><b>Attribution Statement:</b> LactMed is a registered trademark of the U.S. Department of Health and Human Services.</p></div></div><h3>Publisher</h3><p><a href="https://www.nlm.nih.gov/" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">National Institute of Child Health and Human Development</a>, Bethesda (MD)</p><h3>NLM Citation</h3><p>Drugs and Lactation Database (LactMed®) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006-. Green Tea. [Updated 2025 Jan 15].<span class="bk_cite_avail"></span></p></div><div class="small-screen-prev"><a href="/books/n/lactmed/LM1238/?report=reader"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M75,30 c-80,60 -80,0 0,60 c-30,-60 -30,0 0,-60"></path><text x="20" y="28" textLength="60" style="font-size:25px">Prev</text></svg></a></div><div class="small-screen-next"><a href="/books/n/lactmed/LM571/?report=reader"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M25,30c80,60 80,0 0,60 c30,-60 30,0 0,-60"></path><text x="20" y="28" textLength="60" style="font-size:25px">Next</text></svg></a></div></article></div><div id="jr-scripts"><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/libs.min.js"> </script><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.min.js"> </script></div></div>
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